Lines Matching +full:no +full:- +full:tick +full:- +full:in +full:- +full:suspend
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
26 If set to vendor, prefer vendor-specific driver
51 debug output. Bits in debug_layer correspond to a
52 _COMPONENT in an ACPI source file, e.g.,
54 Bits in debug_level correspond to a level in
58 Documentation/firmware-guide/acpi/debug.rst for more information about
76 { strict | lax | no }
79 only). IO ports and memory declared in ACPI might be
80 used by the ACPI subsystem in arbitrary AML code and
88 no: ACPI OperationRegions are not marked as reserved,
89 no further checks are performed.
98 default in APIC mode
102 default in PIC mode
113 by unsupported hardware/firmware features can result in
121 Disable auto-serialization of AML methods
124 auto-serialization feature.
133 By default, SSDTs contained in the RSDT/XSDT will be
142 Ignore the ACPI-based watchdog interface (WDAT) and let
156 be necessary to carry out a cold reboot _twice_ in a
163 acpi_osi=! # disable all built-in OS vendor
165 acpi_osi=!! # enable all built-in OS vendor
169 'acpi_osi=!' can be used in combination with single or
184 'acpi_osi=' cannot be used in combination with other
186 exist in the ACPI namespace. NOTE that such command can
194 'acpi_osi=!*' can be used in combination with single or
227 For broken nForce2 BIOS resulting in XT-PIC timer.
235 as soon as the kernel's real-mode entry point is called.
243 ACPI NVS memory during suspend/hibernation and resume.
248 behave incorrectly in some ways with respect to system
249 suspend and resume to be ignored (use wisely).
255 add_efi_memmap [EFI; X86] Include EFI memory map in
265 See Documentation/sound/alsa-configuration.rst
272 align_va_addr= [X86-64]
277 CPU-intensive style benchmark, and it can vary highly in
280 32: only for 32-bit processes
281 64: only for 64-bit processes
282 on: enable for both 32- and 64-bit processes
283 off: disable for both 32- and 64-bit processes
292 amd_iommu= [HW,X86-64]
293 Pass parameters to the AMD IOMMU driver in the system.
295 fullflush - enable flushing of IO/TLB entries when
299 off - do not initialize any AMD IOMMU found in
301 force_isolation - Force device isolation for all
307 amd_iommu_dump= [HW,X86-64]
313 amd_iommu_intr= [HW,X86-64]
316 legacy - Use legacy interrupt remapping mode.
317 vapic - Use virtual APIC mode, which allows IOMMU
319 This mode requires kvm-amd.avic=1.
333 Power management functions (SPARCstation-4/5 + deriv.)
335 Disable APC CPU standby support. SPARCstation-Fox does
336 not play well with APC CPU idle - disable it if you have
343 when initialising the APIC and IO-APIC components.
344 For X86-32, this can also be used to specify an APIC
364 to set it to "all" by meaning -- no limit here.
373 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
397 audit= [KNL] Enable the audit sub-system
399 0 | off - kernel audit is disabled and can not be
401 unset - kernel audit is initialized but disabled and
403 1 | on - kernel audit is initialized and partially
405 messages in RAM until it is fully enabled by the
416 0 - Disable the BAU.
417 1 - Enable the BAU.
418 unset - Disable the BAU.
439 See Documentation/block/cmdline-partition.rst
443 no delay (0).
450 See Documentation/admin-guide/bootconfig.rst
461 bttv.pll= See Documentation/admin-guide/media/bttv.rst
470 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
478 [NET] Specifies amount of time (in seconds) that
489 inclusive. See arch/mips/include/asm/pgtable-bits.h
499 - foo isn't auto-mounted if you mount all cgroups in
501 - foo isn't visible as an individually mountable
507 cgroup_no_v1= [KNL] Disable cgroup controllers and named hierarchies in v1
511 the blacklisted controllers remain available in cgroup2.
518 nosocket -- Disable socket memory accounting.
519 nokmem -- Disable kernel memory accounting.
524 0 -- check protection applied by kernel (includes
526 1 -- check protection requested by application.
538 device driver but are enabled in hardware at reset or
540 force such clocks to be always-on nor does it reserve
541 those clocks in any way. This parameter is useful for
544 information, see Documentation/driver-api/clk.rst.
546 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
563 [X86-32] pit,hpet,tsc;
569 [SPARC64] tick
570 [X86-64] hpet,tsc
576 architected timer so that code using WFE-based polling
589 being used by the kernel or shown in /proc/cpuinfo.
593 cma=nn[MG]@[start[MG][-end[MG]]]
604 Sets the size of kernel per-numa memory area for
606 per-numa CMA altogether. And If this option is not
608 With per-numa CMA enabled, DMA users on node nid will
610 which is located in node nid, if the allocation fails,
613 cmo_free_hint= [PPC] Format: { yes | no }
615 when they are freed. This is used in CMO environments
624 com20020= [HW,NET] ARCnet - COM20020 chipset
628 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
632 ARCnet - COM90xx chipset (memory-mapped buffers)
650 See Documentation/admin-guide/serial-console.rst for more
660 Start an early, polled-mode console on the 8250/16550
663 MMIO inter-register address stride is either 8-bit
664 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
666 to be equivalent to 'mmio'. 'options' are specified in
668 the h/w is not re-initialized.
681 By default we print messages on consoles in
689 syscall, or to executing "dmesg -S --raw" or to reading
692 consoleblank= [KNL] The console blank (screen saver) timeout in
709 disable the cpuidle sub-system
715 disable the cpufreq sub-system
719 policy to use. This governor must be registered in the
723 [X86] Delay for N microsec between assert and de-assert
725 on every CPU online, such as boot, and resume from suspend.
738 [KNL, X86-64] Select a region under 4G first, and
741 See Documentation/admin-guide/kdump/kdump.rst for further details.
745 in the running system. The syntax of range is
746 start-[end] where start and end are both
748 Documentation/admin-guide/kdump/kdump.rst for an example.
751 [KNL, X86-64] range could be above 4G. Allow kernel
758 [KNL, X86-64] range under 4G. When crashkernel=X,high
763 low memory is needed to make sure DMA buffers for 32-bit
773 [KNL] Disable crypto self-tests
787 See also Documentation/input/devices/joystick-parport.rst
791 Documentation/admin-guide/dynamic-debug-howto.rst for
797 [KNL] Enable printing [hashed] pointers early in the
805 [KNL] verbose self-tests
808 self-tests.
809 We default to 0 (no extra messages), setting it to
810 1 will print _a lot_ more information - normally
827 memory corruption problems caused by bugs in kernel or
848 Format: { on, no-mount, off }
850 no-mount:
855 get a -EPERM as result when trying to register files
858 debugfs was not enabled in the kernel at all.
859 Default value is set in build-time with a kernel configuration.
870 APIs. In addition, this is the default hugetlb size
875 Documentation/admin-guide/mm/hugetlbpage.rst.
879 [KNL] Debugging option to set a timeout in seconds for
882 drivers) that have opted in will be ignored. A timeout of 0
891 off: No s390 zlib hardware support
922 against bounds-checking flaws in the kernel's
982 entries for DMA-API debugging code. One entry is
983 required per DMA-API allocation. Use this if the
984 DMA-API debugging code disables itself because the
988 With this option the DMA-API debugging driver
1000 panels may send no or incorrect EDID data sets.
1002 in the /lib/firmware directory that are used instead.
1003 Generic built-in EDID data sets are used, if one of
1006 and no file with the same name exists. Details and
1008 available in Documentation/admin-guide/edid.rst. An EDID
1013 data set with no connector name will be used for
1020 Control how the dt_cpu_ftrs device-tree binding is
1030 what data is available or for reverse-engineering.
1035 Documentation/admin-guide/dynamic-debug-howto.rst
1039 in some Intel CPUs.
1045 Enable debug messages in early_ioremap support. This
1051 When used with no options, the early console is
1052 determined by stdout-path property in device tree's
1057 Start an early, polled-mode console on a Cadence
1068 Start an early, polled-mode console on the 8250/16550
1070 MMIO inter-register address stride is either 8-bit
1071 (mmio) or 32-bit (mmio32 or mmio32be).
1074 in the same format described for "console=ttyS<n>"; if
1079 Start an early, polled-mode console on a pl011 serial
1083 the driver will use only 32-bit accessors to read/write
1087 Start an early, polled-mode console on a meson serial
1093 Start an early, polled-mode console on an msm serial
1099 Start an early, polled-mode console on an msm serial
1105 Start an early, polled-mode console on a serial port
1111 Start an early, polled-mode console on a serial port
1117 Use RISC-V SBI (Supervisor Binary Interface) for early
1135 Start an early, polled-mode console on a lantiq serial
1149 Start an early, polled-mode, output-only console on the
1154 Start an early, polled-mode console on the
1160 Start an early, polled-mode console on a Qualcomm
1168 coherent non-x86 systems that use system memory for
1204 You can find the port for a given device in
1233 This is designed to be used in conjunction with
1236 This parameter works in place of the kgdboc parameter
1238 very early in the boot process. For early debugging
1250 PCI bridges while in the EFI boot stub.
1251 nochunk: disable reading files in "chunks" in the EFI
1263 on all PCI bridges while in the EFI boot stub
1279 attribute is added to range 0x100000000-0x180000000 and
1280 0x10a0000000-0x1120000000.
1284 range 0x240000000-0x43fffffff.
1296 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1302 elanfreq= [X86-32]
1303 See comment before function elanfreq_setup() in
1310 See Documentation/admin-guide/kdump/kdump.rst for details.
1320 (in particular on some ATI chipsets).
1326 0 -- permissive (log only, no denials).
1327 1 -- enforcing (deny and log).
1351 See also Documentation/fault-injection/.
1355 See Documentation/admin-guide/sysctl/net.rst for
1359 See Documentation/admin-guide/blockdev/floppy.rst.
1362 [IA-64] Avoid check_sal_cache_flush which may hang on
1367 forcepae [X86-32]
1376 as early as possible in order to facilitate early
1381 If no parameter is passed, ftrace will dump
1386 ftrace_filter=[function-list]
1388 tracer at boot up. function-list is a comma separated
1390 time by the set_ftrace_filter file in the debugfs
1393 ftrace_notrace=[function-list]
1394 [FTRACE] Do not trace the functions specified in
1395 function-list. This list can be changed at run time
1396 by the set_ftrace_notrace file in the debugfs
1399 ftrace_graph_filter=[function-list]
1402 function-list is a comma separated list of functions
1404 set_graph_function file in the debugfs tracing directory.
1406 ftrace_graph_notrace=[function-list]
1407 [FTRACE] Do not trace from the functions specified in
1408 function-list. This list is a comma separated list of
1410 set_graph_notrace file in the debugfs tracing directory.
1416 in the tracefs tracing directory. default: 0 (no limit)
1425 suspend/resume & runtime PM (consumers first, then
1428 off -- Don't create device links from firmware info.
1429 permissive -- Create device links from firmware info
1432 on -- Create device links from firmware info and use it
1433 to enforce probe and suspend/resume ordering.
1434 rpm -- Like "on", but also use to order runtime PM.
1440 See also Documentation/input/devices/joystick-parport.rst
1444 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1448 gcov_persist= [GCOV] When non-zero (default), profiling data for
1481 gpio-mockup.gpio_mockup_ranges
1486 [KNL] Should the hard-lockup detector generate
1492 for 64-bit NUMA, off otherwise.
1495 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1502 corresponding firmware-first mode error processing
1506 size of <nn>. This works even on boxes that have no
1516 hpet= [X86-32,HPET] option to control HPET usage
1533 boot-time allocation of gigantic hugepages is skipped.
1541 Documentation/admin-guide/mm/hugetlbpage.rst.
1545 [HW] The size of the HugeTLB pages. This is used in
1551 Documentation/admin-guide/mm/hugetlbpage.rst.
1560 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1566 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1576 useful for debugging when something happens in the window
1589 (disabled by default, and as a pre-condition
1591 i8042.direct [HW] Put keyboard port into non-translated mode
1605 suspend-to-ram transitions, only during s2r
1623 [HW] Report power status in /proc/i8k
1638 -1 -- never invert brightness
1639 0 -- machine default
1640 1 -- force brightness inversion
1645 ide-core.nodma= [HW] (E)IDE subsystem
1651 ide-generic.probe-mask= [HW] (E)IDE subsystem
1655 setting corresponding bits in the mask to 1. The
1663 ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
1673 In such case C2/C3 won't be used again.
1674 idle=nomwait: Disable mwait for CPU C-states
1691 legacy only accept legacy-NaN binaries, if supported
1693 2008 only accept 2008-NaN binaries, if supported
1699 encodings, so if no FPU hardware is present or it has
1702 'relaxed' straps the emulator for both legacy-NaN and
1703 2008-NaN, whereas 'strict' enables legacy-NaN only on
1712 Ignore loglevel setting - this will print /all/
1744 in crypto/hash_info.h.
1776 Formats: { "ima" | "ima-ng" | "ima-sig" }
1777 Default: "ima-ng"
1809 initcall_blacklist= [KNL] Do not execute a comma-separated list of
1810 initcall functions. Useful for debugging built-in
1816 load the initrd. If an initrd is compiled in or
1817 specified in the bootparams, it takes priority over this
1834 override in debugfs after boot.
1843 0 -- basic integrity auditing messages. (Default)
1844 1 -- additional integrity auditing messages.
1854 bypassed by not enabling DMAR with this option. In
1857 forcedac [X86-64]
1859 for io virtual address below 32-bit forcing dual
1861 than 32-bit addressing. The default is to look
1862 for translation below 32-bit and if not available
1863 then look in the higher range.
1866 result in a hardware IOTLB flush operation as opposed
1880 could harm performance of some high-throughput
1894 1 to 9 specify maximum depth of C-state.
1904 used along with the hardware-managed P-states (HWP)
1908 in favor of acpi-cpufreq. Forcing the intel_pstate driver
1909 instead of acpi-cpufreq may disable platform features, such
1911 P-States information being indicated to OSPM and therefore
1914 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
1927 Allow per-logical-CPU P-State performance control limits using
1930 intremap= [X86-64, Intel-IOMMU]
1935 BIOS x2APIC opt-out request will be ignored
1959 0 - Lazy mode.
1965 1 - Strict mode (default).
1972 0 - Use IOMMU translation for DMA.
1973 1 - Bypass the IOMMU for DMA.
1974 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
1976 io7= [HW] IO7 for Marvel-based Alpha systems
1977 See comment before marvel_specify_io7 in
1988 No delay
1991 See Documentation/admin-guide/nfs/nfsroot.rst.
2011 to let secondary kernels in charge of setting up
2015 Enables support for pseudo-NMIs in the kernel. This
2034 [Deprecated - use cpusets instead]
2035 Format: [flag-list,]<cpu-list>
2038 specified in the flag list (default: domain):
2041 Disable the tick when a single task runs.
2043 A residual 1Hz tick is offloaded to workqueues, which you
2061 move in and out of an isolated set anytime.
2066 "number of CPUs in system - 1".
2085 CPUs then this parameter has no effect on the
2089 housekeeping CPUs has no influence on those
2092 The format of <cpu-list> is described above.
2096 ivrs_ioapic [HW,X86-64]
2097 Provide an override to the IOAPIC-ID<->DEVICE-ID
2098 mapping provided in the IVRS ACPI table. For
2099 example, to map IOAPIC-ID decimal 10 to
2103 ivrs_hpet [HW,X86-64]
2104 Provide an override to the HPET-ID<->DEVICE-ID
2105 mapping provided in the IVRS ACPI table. For
2106 example, to map HPET-ID decimal 0 to
2110 ivrs_acpihid [HW,X86-64]
2111 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2112 mapping provided in the IVRS ACPI table. For
2113 example, to map UART-HID:UID AMD0020:0 to
2133 kernelcore= [KNL,X86,IA-64,PPC]
2136 the kernel for non-movable allocations. The requested
2137 amount is spread evenly throughout all nodes in the
2139 movable memory in its own zone, ZONE_MOVABLE. In the
2146 subsystem. Note that allocations like PTEs-from-HighMem
2150 It is possible to specify the exact amount of memory in
2152 memory in the form of "nn%", or "mirror". If "mirror"
2154 for non-movable allocations and remaining memory is used
2162 optional and is the number seconds in between
2163 each poll cycle to the debug port in case you need
2165 gdb or control-c on the dbgp connection. When
2166 not using this parameter you use sysrq-g to break into
2171 or a supported polling keyboard driver (non-usb).
2181 characters and can work in polling mode, you can use
2198 Configure the RouterBoard 532 series on-chip
2201 kmemleak= [KNL] Boot-time kmemleak enable/disable
2207 kprobe_event=[probe-list]
2209 The probe-list is a semicolon delimited list of probe
2255 kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM.
2258 kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU)
2260 Default is 1 (enabled) if in 64-bit or 32-bit PAE mode.
2262 kvm-arm.vgic_v3_group0_trap=
2263 [KVM,ARM] Trap guest accesses to GICv3 group-0
2266 kvm-arm.vgic_v3_group1_trap=
2267 [KVM,ARM] Trap guest accesses to GICv3 group-1
2270 kvm-arm.vgic_v3_common_trap=
2274 kvm-arm.vgic_v4_enable=
2286 kvm-intel.ept= [KVM,Intel] Disable extended page tables
2290 kvm-intel.emulate_invalid_guest_state=
2294 kvm-intel.flexpriority=
2298 kvm-intel.nested=
2302 kvm-intel.unrestricted_guest=
2307 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2308 CVE-2018-3620.
2317 Default is cond (do L1 cache flush in specific instances)
2319 kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification
2332 enables all mitigations in the
2338 when the first VM is started in a
2356 when the first VM is started in a
2368 when the first VM is started in a
2374 warn when a VM is started in a potentially
2386 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2392 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2396 value for LAPIC timer one-shot implementation. Default
2397 back to the programmable timer unit in the LAPIC.
2401 in C2 power state.
2415 libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume
2431 first fan-out link behind PMP device. It does not
2436 as there's no ambiguity shortcut notation is allowed.
2445 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2449 * [no]ncq: Turn on or off NCQ.
2451 * [no]ncqtrim: Turn off queued DSM TRIM.
2457 hot-unplug link recovery
2494 Set the number of locking read-acquisition kthreads.
2499 Set the number of locking write-acquisition kthreads.
2502 Set time (s) after boot for CPU-hotplug testing.
2505 Set time (s) between CPU-hotplug operations, or
2506 zero to disable CPU-hotplug testing.
2509 Set task-shuffle interval (jiffies). Shuffling
2510 tasks allows some CPUs to go into dyntick-idle
2515 is useful for hands-off automated testing.
2548 7 (KERN_DEBUG) debug-level messages
2551 in bytes. n must be a power of two and greater
2558 logo.nologo [FB] Disables display of the built-in Linux logo.
2567 specified in addition to the ports) causes
2576 an IEEE 1284-compliant printer is attached; if
2582 time-consuming boot-time autodetection (up to 250 ms per
2589 will cause delays in the kernel to be wrong, leading to
2591 unlikely, in the extreme case this might damage your
2603 machvec= [IA-64] Force the use of a particular machine-vector
2604 (machvec) in a generic kernel.
2609 Example: machtype=lemote-yeeloong-2f-7inch
2624 (loop.max_loop) unconditionally pre-created at init time. The default
2627 devices can be requested on-demand with the
2628 /dev/loop-control interface.
2630 mce [X86-32] Machine Check Exception
2632 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2635 See Documentation/admin-guide/md.rst.
2642 Control mitigation for the Micro-architectural Data
2649 In vulnerable processors, the speculatively
2650 forwarded data can be used in a cache side channel
2657 full - Enable MDS mitigation on vulnerable CPUs
2658 full,nosmt - Enable MDS mitigation and disable
2660 off - Unconditionally disable MDS mitigation
2662 On TAA-affected machines, mds=off can be prevented by
2664 mitigated with the same mechanism so in order to disable
2671 For details see: Documentation/admin-guide/hw-vuln/mds.rst
2674 Amount of memory to be used in cases as follows:
2687 in above case 3, memory may need be hot added after boot
2690 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
2695 per-device physically contiguous DMA buffers.
2703 See Documentation/admin-guide/mm/memory-hotplug.rst.
2728 Example: Exclude memory from 0x18690000-0x1869ffff
2742 memmap=<size>%<offset>-<oldtype>+<newtype>
2744 from <oldtype> to <newtype>. If "-<oldtype>" is left
2753 memory when doing things like suspend/resume.
2759 repeatable BIOS-originated corruption always
2764 By default it checks for corruption in the low
2767 corruption in more or less memory.
2784 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2792 Refer to Documentation/virt/kvm/amd-memory-encryption.rst
2795 mem_sleep_default= [SUSPEND] Default system suspend mode:
2796 s2idle - Suspend-To-Idle
2797 shallow - Power-On Suspend or equivalent (if supported)
2798 deep - Suspend-To-RAM or equivalent (if supported)
2799 See Documentation/admin-guide/pm/sleep-states.rst.
2802 See Documentation/admin-guide/media/meye.rst.
2804 mfgpt_irq= [IA-32] Specify the IRQ to use for the
2805 Multi-Function General Purpose Timers on AMD Geode
2808 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
2822 0 - The attached screen is the 3.5" TFT
2823 1 - The attached screen is the 7" TFT
2824 2 - The VGA Shield is attached (1024x768)
2828 b - Enable backlight. The TFT backlight pin will be
2832 c - Enable the s3c camera interface.
2833 t - Reserved for enabling touchscreen support. The
2834 touchscreen support is not enabled in the mainstream
2836 in the "bleeding edge" mini2440 support kernel at
2837 https://repo.or.cz/w/linux-2.6/mini2440.git
2842 arch-independent options, each of which is an
2843 aggregation of existing arch-specific options.
2856 ssbd=force-off [ARM64]
2874 have other ways of avoiding SMT-based attacks.
2899 module_blacklist= [KNL] Do not load a comma-separated list of
2906 touchpads working in absolute mode only).
2913 movablecore= [KNL,X86,IA-64,PPC]
2924 movable_node [KNL] Boot-time switch to make hotplugable memory
2931 Format: <name>,<region-number>,<size>,<offset>
2934 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
2943 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
2947 boundary - index of last SLC block on Flex-OneNAND.
2949 lock - Configure if Flex-OneNAND boundary should be locked.
2956 See arch/arm/mach-s3c2412/mach-jive.c
2984 something different and driver-specific.
2985 This usage is only documented in each driver source
2995 See Documentation/admin-guide/nfs/nfsroot.rst.
2997 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
2998 See Documentation/admin-guide/nfs/nfsroot.rst.
3001 See Documentation/admin-guide/nfs/nfsroot.rst.
3025 [NFS] enable 64-bit inode numbers.
3026 If zero, the NFS client will fake up a 32-bit inode
3028 of returning the full 64-bit number.
3029 The default is to return 64-bit inode numbers.
3035 callbacks the client will process in parallel for
3043 Note that there is little point in setting this
3051 'sec=sys' security flavour. In effect it is
3059 [NFS4] Specify an additional fixed unique ident-
3066 information in exchange_id requests.
3067 If zero, no implementation identification information
3076 no guarantees that the file will remain unchanged
3090 driver. A non-zero value sets the minimum interval
3091 in seconds between layoutstats transmissions.
3101 Dump stacks even of idle CPUs in response to an
3102 NMI stack-backtrace request.
3111 0 - turn hardlockup detector in nmi_watchdog off
3112 1 - turn hardlockup detector in nmi_watchdog on
3125 [NET] Specifies amount of time (in seconds) that
3129 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3133 no5lvl [X86-64] Disable 5-level paging mode. Forces
3134 kernel to use 4-level paging instead.
3139 [HW] Never suspend the console
3140 Disable suspending of consoles during suspend and
3144 debugging driver suspend/resume hooks). This may
3157 without any limit and this data is stored in memory,
3160 data will be no longer available. This parameter
3165 caches in the slab allocator. Saves per-node memory,
3174 IOAPICs that may be present in the system.
3185 nodelayacct [KNL] Disable per-task delay accounting
3191 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3193 noexec [IA-64]
3196 On X86-32 available only on PAE configured kernels.
3197 noexec=on: enable non-executable mappings (default)
3198 noexec=off: disable non-executable mappings
3208 noexec32 [X86-64]
3209 This affects only 32-bit executables.
3210 noexec32=on: enable non-executable mappings (default)
3212 noexec32=off: disable non-executable mappings
3217 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3219 legacy floating-point registers on task switch.
3232 possible in the system.
3243 [PPC] Don't flush the L1-D cache after accessing user data.
3247 enabling legacy floating-point and sse state.
3249 noxsaveopt [X86] Disables xsaveopt used in saving x86 extended
3256 noxsaves [X86] Disables xsaves and xrstors used in saving and
3257 restoring x86 extended register state in compacted
3260 in standard form of xsave area. By using this
3272 nohalt [IA-64] Tells the kernel not to use the power saving
3274 power-consumption. On the positive side, it reduces
3275 interrupt wake-up latency, which may improve performance
3276 in certain environments such as networked servers or
3277 real-time systems.
3287 In kernels built with CONFIG_NO_HZ_FULL=y, set
3288 the specified list of CPUs whose tick will be stopped
3291 in this list will have their RCU callbacks offloaded,
3292 just as if they had also been called out in the
3297 noirqdebug [X86-32] Disables the code which attempts to detect and
3308 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3310 [Deprecated - use intremap=off]
3312 nointroute [IA-64]
3316 nojitter [IA-64] Disables jitter checking for ITC timers.
3318 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3320 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3323 no-vmw-sched-clock
3327 no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time
3331 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3333 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3338 nomca [IA-64] Disable machine check abort handling
3340 nomce [X86-32] Disable Machine Check Exception
3342 nomfgpt [X86-32] Disable Multi-Function General Purpose
3354 nopcid [X86-64] Disable the PCID cpu feature.
3359 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3370 no-scroll [VGA] Disables scrollback.
3371 This is required for the Braillex ib80-piezo Braille
3374 nosbagart [IA-64]
3376 nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
3381 nosoftlockup [KNL] Disable the soft-lockup detector.
3386 soft-lockup and NMI watchdog (hard-lockup).
3390 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3395 1. Resume from suspend/hibernate depends on CPU0.
3396 Suspend/hibernate will fail if CPU0 is offline and you
3397 need to online CPU0 before suspend/hibernate.
3407 This parameter sets the maximum duration, in
3415 nptcg= [IA-64] Override max number of concurrent global TLB
3422 number of already plugged CPU during bootup, later in
3424 n. So during boot up some boot time memory for per-cpu
3425 variables need be pre-allocated for later physical cpu
3436 See Documentation/admin-guide/sysctl/vm.rst for details.
3439 See Documentation/core-api/debugging-via-ohci1394.rst for more
3478 running on a platform with a direct-mapped memory-side
3484 page_owner= [KNL] Boot-time page_owner enabling option.
3486 each page is disabled in default. With this switch,
3490 page_poison= [KNL] Boot-time parameter changing the state of
3509 bit 5: print all printk messages in buffer
3511 panic_on_taint= Bitmask for conditionally calling panic() in add_taint()
3515 called with any of the flags in this set.
3520 See Documentation/admin-guide/tainted-kernels.rst for
3528 Run kdump after running panic-notifiers and dumping
3530 succeeds in any situation.
3552 Parallel ports are assigned in the order they
3557 Configure VIA parallel port to operate in
3559 computer where firmware has no options for setting
3573 See also Documentation/admin-guide/blockdev/paride.rst.
3579 specified in one of the following formats:
3597 devices in the system.
3602 bios [X86-32] force use of PCI BIOS, don't access
3604 has a non-standard PCI host bridge.
3605 nobios [X86-32] disallow use of PCI BIOS, only direct
3610 Mechanism 1 (config address in IO port 0xCF8,
3611 data in IO port 0xCFC, both 32-bit).
3613 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
3614 the function, IO port 0xCFA, also 8-bit, sets
3616 through ports 0xC000-0xCFFF).
3623 root domains (aka PCI segments, in ACPI-speak).
3631 disable the use of MSI interrupts system-wide.
3636 primary IO-APIC for bridges that cannot disable
3643 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
3667 F0000h-100000h range.
3672 assign-busses [X86] Always assign all PCI bus
3676 in the BIOS $PIR table. This is needed on
3679 notebooks. This will have no effect if ACPI
3690 This is normally done in pci_enable_device(),
3700 bfsort Sort PCI devices into breadth-first order.
3703 nobfsort Don't sort PCI devices into breadth-first order.
3705 tuning and use the BIOS-configured MPS defaults.
3711 value (no larger than the MPS that the device
3715 configuration allows peer-to-peer DMA between
3718 that hot-added devices will work.
3733 A PCI-PCI bridge can be specified if resource
3739 for 4096-byte alignment.
3741 end-to-end CRC checking).
3770 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
3782 Specify one or more PCI devices (in the format
3789 may put more devices in an IOMMU group.
3806 dpc-native Use native PCIe service for DPC only. May
3823 Keep all power-domains already enabled by bootloader on,
3824 even if no driver has claimed them. This is useful
3829 See Documentation/admin-guide/blockdev/paride.rst.
3839 See comments in mm/percpu.c for details on each
3844 See Documentation/admin-guide/blockdev/paride.rst.
3847 See Documentation/admin-guide/blockdev/paride.rst.
3849 pirq= [SMP,APIC] Manual mp-table setup
3850 See Documentation/x86/i386/IO-APIC.rst.
3854 See also Documentation/admin-guide/parport.rst.
3860 pm_debug_messages [SUSPEND,KNL]
3861 Enable suspend/resume debug messages during boot up.
3865 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
3874 { on | off | curr | res | no-curr | no-res }
3883 Ranges are in pairs (I/O port base and size).
3888 Ranges are in pairs (memory base and size).
3912 print-fatal-signals=
3918 coredump - etc.
3921 you might want to try "ulimit -i unlimited".
3933 on - unlimited logging to /dev/kmsg from userspace
3934 off - logging to /dev/kmsg disabled
3935 ratelimit - ratelimit the logging
3942 Limit processor to maximum C-state
3946 Ignore the _CST method to determine C-states,
3953 Param: "schedule" - profile schedule points.
3954 Param: "sleep" - profile D-state sleeping (millisecs).
3956 Param: "kvm" - profile VM exits.
3957 Param: <number> - step/bucket size as a power of 2 for
3973 psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports
3979 [HW,MOUSE] Set desired mouse resolution, in dpi.
3987 See Documentation/admin-guide/blockdev/paride.rst.
3989 pti= [X86-64] Control Page Table Isolation of user and
3994 on - unconditionally enable
3995 off - unconditionally disable
3996 auto - kernel detects whether your CPU model is
4001 nopti [X86-64]
4005 [KNL] Number of legacy pty's. Overwrites compiled-in
4013 See Documentation/admin-guide/md.rst.
4015 ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
4016 See Documentation/admin-guide/blockdev/ramdisk.rst.
4026 ras=option[,option,...] [KNL] RAS-specific options
4037 In kernels built with CONFIG_RCU_NOCB_CPU=y, set
4038 the specified list of CPUs to be no-callback CPUs.
4041 purpose, where "x" is "p" for RCU-preempt, and
4042 "s" for RCU-sched, and "N" is the CPU number.
4044 which can be useful for HPC and real-time
4053 This improves the real-time response for the
4061 process in one batch.
4070 RCU grace-period cleanup.
4074 RCU grace-period initialization.
4078 RCU grace-period pre-initialization, that is,
4079 the propagation of recent CPU-hotplug changes up
4084 per-CPU rcuc kthreads. Defaults to a non-zero
4092 cache-to-cache transfer latencies.
4098 and for NUMA systems with large remote-access
4107 whole algorithm to behave better in low memory
4111 Set delay from grace-period initialization to
4122 Set required age in jiffies for a
4124 soliciting quiescent-state help from
4130 This calculated value may be viewed in
4136 Set the SCHED_FIFO priority of the RCU per-CPU
4139 and for the RCU grace-period kthreads (rcu_bh,
4141 set, valid values are 1-99 and the default is 1
4142 (the least-favored priority). Otherwise, when
4143 RCU_BOOST is not set, valid values are 0-99 and
4144 the default is zero (non-realtime operation).
4147 Set the number of NOCB callback kthreads in
4150 the wakeup overhead on the global grace-period
4152 each group's NOCB grace-period kthread.
4160 batch limiting is re-enabled.
4164 RCU's force-quiescent-state scan will aggressively
4182 Cause the grace-period kthread to get an extra
4184 it should at force-quiescent-state time.
4189 In CONFIG_RCU_STRICT_GRACE_PERIOD=y kernels,
4190 this specifies an rcu_read_unlock()-time delay
4191 in microseconds. This defaults to zero.
4194 of RCU-protected pointers after the relevant
4204 grace-period primitives such as call_rcu().
4215 grace-period primitives.
4218 Set test-start holdoff period. The purpose of
4220 test until boot completes in order to avoid
4230 Number of allocations and frees done in an iteration.
4237 Set number of RCU readers. The value -1 selects
4239 "n" less than -1 selects N-n+1, where N is again
4240 the number of CPUs. For example, -2 selects N
4241 (the number of CPUs), -3 selects N+1, and so on.
4242 A value of "n" less than or equal to -N selects
4255 complete. This is useful for hands-off automated
4262 Write-side holdoff between grace periods,
4263 in microseconds. The default of zero says
4264 no holdoff.
4268 in microseconds.
4272 in microseconds.
4276 in seconds.
4279 Enable RCU grace-period forward-progress testing
4283 Specify the fraction of a CPU-stall-warning
4284 period to do tight-loop forward-progress testing.
4288 forward-progress tests.
4292 need_resched() during tight-loop forward-progress
4296 Use conditional/asynchronous update-side
4300 Use expedited update-side primitives, if available.
4303 Use normal (non-expedited) asynchronous
4304 update-side primitives, if available.
4307 Use normal (non-expedited) synchronous
4308 update-side primitives, if available. If all
4312 they are all non-zero.
4320 Leak an RCU-protected pointer out of the reader.
4321 This can of course result in splats, and is
4331 stress RCU, they don't participate in the actual
4335 Set number of RCU readers. The value -1 selects
4336 N-1, where N is the number of CPUs. A value
4337 "n" less than -1 selects N-n-2, where N is again
4338 the number of CPUs. For example, -2 selects N
4339 (the number of CPUs), -3 selects N+1, and so on.
4342 Enable debug-object double-call_rcu() testing.
4345 Set time (s) after boot for CPU-hotplug testing.
4348 Set time (jiffies) between CPU-hotplug operations,
4349 or zero to disable CPU-hotplug testing.
4352 Set the number of read-then-exit kthreads used
4354 task-exit processing.
4357 The number of times in a given read-then-exit
4358 episode that a set of read-then-exit kthreads
4362 The delay, in seconds, between successive
4363 read-then-exit testing episodes.
4366 Set task-shuffle interval (s). Shuffling tasks
4367 allows some CPUs to go into dyntick-idle mode
4372 is useful for hands-off automated testing.
4380 in warnings from preemptible RCU in addition
4381 to any other stall-related activity.
4391 grace-period kthread to test RCU CPU stall
4406 Test RCU priority boosting? 0=no, 1=maybe, 2=yes.
4417 Test RCU's dyntick-idle handling. See also the
4443 Use expedited grace-period primitives, for
4447 real-time latency, and degrade energy efficiency.
4448 No effect on CONFIG_TINY_RCU kernels.
4451 Use only normal grace-period primitives,
4454 real-time latency, CPU utilization, and
4456 increased grace-period latency. This parameter
4457 overrides rcupdate.rcu_expedited. No effect on
4463 only normal grace-period primitives. No effect
4467 Set time in jiffies during which RCU tasks will
4470 number avoids disturbing real-time workloads,
4474 Set timeout in jiffies for RCU task stall warning
4487 force - Override the decision by the kernel to hide the
4490 support, specifically around the suspend/resume
4515 Set test-start holdoff period. The purpose of
4517 test until boot completes in order to avoid
4524 but the default has already reduced the per-pass
4529 Set number of readers. The default value of -1
4538 Set the read-side critical-section duration,
4539 measured in microseconds.
4542 Specify the read-protection implementation to test.
4555 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
4563 reservetop= [X86-32]
4577 Specify the partition device for software suspend
4584 in <PAGE_SIZE> units (needed only for swap files).
4585 See Documentation/power/swsusp-and-swap-files.rst
4587 resumedelay= [HIBERNATION] Delay (in seconds) to pause before attempting to
4598 no Disable hibernation and resume.
4601 during restoration read-only).
4624 ro [KNL] Mount root device read-only on boot
4627 on Mark read-only kernel memory as read-only (default).
4628 off Leave read-only kernel memory writable for debugging.
4633 debug-uart get routed to the D+ and D- pins of the usb
4637 See name_to_dev_t comment in init/do_mounts.c.
4639 rootdelay= [KNL] Delay (in seconds) to pause before attempting to
4655 rw [KNL] Mount root device read-write on boot
4657 S [KNL] Run init in single mode
4662 With strict flushing every unmap operation will result in
4675 incurs a small amount of overhead in the scheduler
4697 to 10 seconds for built-in smp_call_function()
4702 up to the chosen limit in seconds. Zero (the
4704 that requesting even small non-zero numbers of
4705 seconds can result in RCU CPU stall warnings,
4711 The default of -1 specifies a number of kthreads
4716 test before initiating CPU-hotplug operations.
4720 CPU-hotplug operations. Specifying zero (which
4721 is the default) disables CPU-hotplug operations.
4727 Non-zero values are useful for automated tests.
4750 "wait" parameter. A value of -1 selects the
4751 default if all other weights are -1. However,
4753 value of -1 will instead select a weight of zero.
4758 non-zero "wait" parameter. See weight_single.
4771 non-zero "wait" parameter. See weight_single
4783 non-zero "wait" parameter. See weight_single
4786 skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate
4790 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
4791 1 -- enable.
4802 0 -- disable.
4803 1 -- enable.
4809 0 -- disable.
4810 1 -- enable.
4813 serialnumber [BUGS=X86-32]
4818 simeth= [IA-64]
4826 allocs to different slabs, especially in hardened
4846 may poison objects when not in use. Also tracks the
4852 memory cgroup sub-caches. 1 to enable, 0 to disable.
4885 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
4886 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
4887 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
4888 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
4889 smsc-ircc2.ircc_irq= [HW] IRQ line
4890 smsc-ircc2.ircc_dma= [HW] DMA channel
4891 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
4901 Default: -1 (no limit)
4904 [KNL] Should the soft-lockup detector generate panics.
4907 A value of 1 instructs the soft-lockup detector
4908 to panic the machine when a soft-lockup occurs. It is
4911 respective build-time switch to that functionality.
4914 [KNL] Should the soft-lockup detector generate
4919 See Documentation/admin-guide/laptops/sonypi.rst
4926 on - unconditionally enable, implies
4928 off - unconditionally disable, implies
4930 auto - kernel detects whether your CPU model is
4947 retpoline - replace indirect branches
4948 retpoline,generic - google's original retpoline
4949 retpoline,amd - AMD-specific minimal thunk
4959 on - Unconditionally enable mitigations. Is
4962 off - Unconditionally disable mitigations. Is
4965 prctl - Indirect branch speculation is enabled,
4971 - Like "prctl" above, but only STIBP is
4977 - Same as "prctl" above, but all seccomp
4982 - Like "seccomp" above, but only STIBP is
4987 auto - Kernel selects the mitigation depending on
5002 as "Speculative Store Bypass" in which recent stores
5009 In vulnerable processors, the speculatively forwarded
5010 store can be used in a cache side channel attack, for
5019 on - Unconditionally disable Speculative Store Bypass
5020 off - Unconditionally enable Speculative Store Bypass
5021 auto - Kernel detects whether the CPU model contains an
5027 prctl - Control Speculative Store Bypass per thread
5031 seccomp - Same as "prctl" above, but all seccomp threads
5039 on,auto - On Power8 and Power9 insert a store-forwarding
5043 off - No action.
5058 boundaries will result in an alignment check exception.
5060 off - not enabled
5062 warn - the kernel will emit rate limited warnings
5067 fatal - the kernel will send SIGBUS to applications
5070 If an #AC exception is hit in the kernel or in
5071 firmware (i.e. not while executing in user mode)
5072 the kernel will oops in either "warn" or "fatal"
5079 Certain CPUs are vulnerable to an MDS-like
5087 result in reduced throughput from /dev/urandom.
5097 grace-period sequence counter wrap for the
5098 srcu_data structure's ->srcu_gp_seq_needed field.
5099 The greater the number of bits set in this kernel
5120 force-on: Unconditionally enable mitigation for
5122 force-off: Unconditionally disable mitigation for
5124 kernel: Always enable mitigation in the
5127 interest in being mitigated too.
5131 is in page units and it defines how many pages prior
5133 growing up) the main stack are reserved for no other
5139 stacktrace_filter=[function-list]
5141 will trace at boot up. function-list is a comma separated
5143 time by the stack_trace_filter file in the debugfs
5149 Set the STI (builtin display/keyboard on the HP-PARISC
5151 as the initial boot-console.
5152 See also comment in drivers/video/console/sticore.c.
5155 See comment in drivers/video/console/sticore.c.
5164 originate from a privileged port (i.e. a port in the
5175 process in parallel from a single connection.
5176 The default value is 0 (no limit).
5192 to global on non-NUMA machines)
5203 suspend.pm_test_delay=
5204 [SUSPEND]
5205 Sets the number of seconds to remain in a suspend test
5216 [KNL] Enable accounting of swap in memory resource
5217 controller if no parameter or 1 is given or disable
5218 it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
5220 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
5222 <int> -- Number of I/O TLB slabs
5223 force -- force using of bounce buffers even if they
5225 noforce -- Never use bounce buffers (for debugging)
5234 are reported in the kernel log. Sysctls registered
5243 in older udev will not work anymore.
5244 Default depends on CONFIG_SYSFS_DEPRECATED_V2 set in
5249 Ignore sysrq setting - this boot parameter will
5257 cache size. See Documentation/networking/ip-sysctl.rst
5262 test_suspend= [SUSPEND][,N]
5263 Specify "mem" (for Suspend-to-RAM) or "standby" (for
5264 standby suspend) or "freeze" (for suspend type freeze)
5268 wakeup-capable RTC alarm.
5274 -1: disable all active trip points in all thermal zones
5278 -1: disable all critical trip points in all thermal zones
5289 -1: disable all passive trip points
5295 <deci-seconds>: poll all this frequency
5296 0: no polling (default)
5317 Prevent the CPU-hotplug component of torturing
5321 Dump the ftrace buffer at torture-test shutdown,
5322 even if there were no errors. This can be a
5325 with rotating-rust storage.
5331 Specify that at suspend time, the tpm driver
5341 trace_event=[event-list]
5342 [FTRACE] Set and start specified trace events in order
5343 to facilitate early boot debugging. The event-list is a
5347 trace_options=[option-list]
5349 The option-list is a comma delimited list of options
5373 tracepoint_printk kernel cmdline option has no effect.
5385 file located in /sys/kernel/debug/tracing/
5399 See Documentation/admin-guide/mm/transhuge.rst
5407 high-resolution timer mode on older hardware, and in
5417 in situations with strict latency requirements (where
5428 Extensions (TSX) feature in Intel processors that
5433 on - Enable TSX on the system. Although there are
5436 several previous speculation-related CVEs, and
5440 off - Disable TSX on the system. (Note that this
5448 auto - Disable TSX if X86_BUG_TAA is present,
5453 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5459 Similar to Micro-architectural Data Sampling (MDS)
5466 In vulnerable processors, the speculatively forwarded
5467 data can be used in a cache side channel attack, to
5474 full - Enable TAA mitigation on vulnerable CPUs
5477 full,nosmt - Enable TAA mitigation and disable SMT on
5480 vulnerable to cross-thread TAA attacks.
5481 off - Unconditionally disable TAA mitigation
5483 On MDS-affected machines, tsx_async_abort=off can be
5485 are mitigated with the same mechanism so in order to disable
5495 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5501 See also Documentation/input/devices/joystick-parport.rst
5503 udbg-immortal [PPC] When debugging early kernel crashes that
5509 Set number of hash buckets for UDP/UDP-Lite connections
5511 uhci-hcd.ignore_oc=
5513 Some badly-designed motherboards generate lots of
5524 (default -1 = authorized except for wireless USB,
5529 [USB] The autosuspend time delay (in seconds) used
5530 for newly-detected USB devices (default 2). This
5539 [USB] Maximum number of bytes to snoop in each URB
5550 [USB] Memory limit (in MB) for buffers allocated by
5558 [USB] Specifies timeout for the initial 64-byte
5559 USB_REQ_GET_DESCRIPTOR request in milliseconds
5565 [USB] A list of quirk entries to augment the built-in
5568 VendorID:ProductID:Flags. The IDs are 4-digit hex
5570 will change the built-in quirk; setting it if it is
5575 a 255-byte read);
5579 Set-Interface requests);
5595 require the interval in microframes (1
5598 (bInterval-1).
5602 variable used in the calculation);
5616 to be disconnected before suspend to
5633 usb-storage.delay_use=
5634 [UMS] The delay in seconds before a new device is
5637 usb-storage.quirks=
5639 override the built-in unusual_devs list. List
5642 and Product ID values (4-digit hex numbers) and
5644 to a common usb-storage quirk flag as follows:
5685 medium is write-protected).
5687 even if the device claims no cache,
5694 1 - undefined instruction events
5695 2 - system calls
5696 4 - invalid data aborts
5697 8 - SIGSEGV faults
5698 16 - SIGBUS faults
5704 nohigh = do not allocate PTE pages in
5714 vdso32= [X86] Control the 32-bit vDSO
5715 vdso32=1: enable 32-bit VDSO
5716 vdso32=0 or vdso32=2: disable 32-bit VDSO
5726 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
5728 vector= [IA-64,SMP]
5759 vga= [BOOT,X86-32] Select a particular video mode
5761 Documentation/admin-guide/svga.rst.
5776 - Disable all of the above options
5797 vsyscall= [X86-64]
5800 code). Most statically-linked binaries and older
5824 see VGA-softcursor.txt. Default: 2 = underline.
5829 This is a 16-member array composed of values
5830 ranging from 0-255.
5835 This is a 16-member array composed of values
5836 ranging from 0-255.
5841 This is a 16-member array composed of values
5842 ranging from 0-255.
5847 Set system-wide default UTF-8 mode for all tty's.
5848 Default is 1, i.e. UTF-8 mode is enabled for all
5853 Format=<-1|0|1>
5854 Set system-wide default for whether a cursor
5855 is shown on new VTs. Default is -1,
5860 vt.italic= [VT] Default color for italic text; 0-15.
5863 vt.underline= [VT] Default color for underlined text; 0-15.
5867 see Documentation/watchdog/watchdog-parameters.rst
5868 or other driver-specific files in the
5874 threshold in seconds. The soft lockup detector
5884 duration in seconds. The default value is 30 and
5891 issued on, which results in better behavior in
5894 that this also can be controlled per-workqueue for
5898 Per-cpu workqueues are generally preferred because
5900 locality; unfortunately, per-cpu workqueues tend to
5903 Enabling this makes the per-cpu workqueues which
5915 on the local CPU. This guarantee is no longer true
5918 forces round-robin CPU selection to flush out
5923 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
5927 x86_intel_mid_timer= [X86-32,APBT]
5933 xen_512gb_limit [KNL,X86-64,XEN]
5943 ide-disks -- unplug primary master IDE devices
5944 aux-ide-disks -- unplug non-primary-master IDE devices
5945 nics -- unplug network devices
5946 all -- unplug all emulated devices (NICs and IDE disks)
5947 unnecessary -- unplugging emulated devices is
5950 never -- do not unplug even if version check succeeds
5963 run as generic HVM guest with no PV drivers.
5973 xen_timer_slop= [X86-64,XEN]
5974 Set the timer slop (in nanoseconds) for the virtual Xen
5981 How long to delay EOI handling in case of event
5991 preferred over the 2-level event handling, as it is
5997 as generic guest with no PV drivers. Currently support
6018 xhci-hcd.quirks [USB,KNL]
6021 consulted in header drivers/usb/host/xhci.h.