1config VGA_ARB
2	bool "VGA Arbitration" if EXPERT
3	default y
4	depends on (PCI && !S390)
5	help
6	  Some "legacy" VGA devices implemented on PCI typically have the same
7	  hard-decoded addresses as they did on ISA. When multiple PCI devices
8	  are accessed at same time they need some kind of coordination. Please
9	  see Documentation/gpu/vgaarbiter.rst for more details. Select this to
10	  enable VGA arbiter.
11
12config VGA_ARB_MAX_GPUS
13	int "Maximum number of GPUs"
14	default 16
15	depends on VGA_ARB
16	help
17	  Reserves space in the kernel to maintain resource locking for
18	  multiple GPUS.  The overhead for each GPU is very small.
19
20config VGA_SWITCHEROO
21	bool "Laptop Hybrid Graphics - GPU switching support"
22	depends on X86
23	depends on ACPI
24	select VGA_ARB
25	help
26	  Many laptops released in 2008/9/10 have two GPUs with a multiplexer
27	  to switch between them. This adds support for dynamic switching when
28          X isn't running and delayed switching until the next logoff. This
29	  feature is called hybrid graphics, ATI PowerXpress, and Nvidia
30	  HybridPower.
31