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2 Brief Notes on C-Media 8338/8738/8768/8770 Driver
8 Front/Rear Multi-channel Playback
9 ---------------------------------
13 DACs, both streams are handled independently unlike the 4/6ch multi-
17 card#0) for front and 4/6ch playbacks, while the second PCM device
22 - The first DAC supports U8 and S16LE formats, while the second DAC
24 - The second DAC supports only two channel stereo.
30 The rear output can be heard only when "Four Channel Mode" switch is
35 When "Four Channel Mode" switch is off, the output from rear speakers
38 before your turn off this switch.
44 on and "double DAC" mode. Actually I could hear separate 4 channels
51 control switch in the driver "Line-In As Rear", which you can change
52 via alsamixer or somewhat else. When this switch is on, line-in jack
56 The "Exchange DAC" switch is used to exchange front and rear playback
60 4/6 Multi-Channel Playback
61 --------------------------
63 The recent CM8738 chips support for the 4/6 multi-channel playback
66 When the multi-channel is supported, the driver name has a suffix
67 "-MC" such like "CMI8738-MC6". You can check this name from
70 When the 4/6-ch output is enabled, the second DAC accepts up to 6 (or
71 4) channels. While the dual DAC supports two different rates or
72 formats, the 4/6-ch playback supports only the same condition for all
73 channels. Since the multi-channel playback mode uses both DACs, you
74 cannot operate with full-duplex.
77 in alsa-lib. For example, you can play a WAV file with 6 channels like
80 % aplay -Dsurround51 sixchannels.wav
82 For programming the 4/6 channel playback, you need to specify the PCM
84 with 4 channels,
90 snd_pcm_hw_params_set_channels(pcm, hw, 4);
92 and use the interleaved 4 channel data.
96 Line-In Mode
97 an enum control to change the behavior of line-in
98 jack. Either "Line-In", "Rear Output" or "Bass Output" can
101 When "Rear Output" is chosen, the surround channels 3 and 4
102 are output to line-in jack.
103 Mic-In Mode
104 an enum control to change the behavior of mic-in
105 jack. Either "Mic-In" or "Center/LFE Output" can be
108 channels (channels 5 and 6) are output to mic-in jack.
111 -----------
122 % aplay -Dhw:0,2 foo.wav
128 % aplay -Dspdif foo.wav
136 To enable SPDIF output, you need to turn on "IEC958 Output Switch"
138 so-called S/PDIF). Then you'll see the red light on from the card so
141 from line-out with "IEC958 In Monitor" switch at any time (see
147 off. (Also don't forget to turn on "IEC958 Output Switch", too.)
153 Mix analog PCM playback and FM-OPL/3 streams and
154 output through SPDIF. This switch appears only on old chip
162 Select SPDIF input, the internal CD-in (false)
175 configuration with hardware dip-switch.
187 Note: When "PCM Playback Switch" is on, you'll hear the digital output
188 stream through analog line-out.
192 ----------------------------
196 access it via alsa-lib. See alsa-lib documents for more details.
198 On the raw digital mode, the "PCM Playback Switch" is automatically
199 turned off so that non-audio data is heard from the analog line-out.
205 the alsa-lib. If you need to bypass the software conversion of IEC958
211 ----------------------
219 - PCM playback switch
220 - PCM capture switch (to capture the data sent to DAC)
221 - Mic Boost switch
222 - Mic capture volume
223 - Aux playback volume/switch and capture switch
224 - 3D control switch
228 ---------------
230 With CMI8338 chips, the MPU401-UART interface is disabled as default.
246 --------------
258 ------------------
261 joystick_port=1 module option. The value 1 means the auto-detection.
262 If the auto-detection fails, try to pass the exact I/O address.
264 The modem is enabled dynamically via a card control switch "Modem".
268 ---------------------