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Hi,
I seek to use my onboard 4 ch sound in a two stereo setup. so I can
connect a headset to the rear speakers.
I am using gentoo with kernel 2.6.21-ck2-r1 and the alsa provided in the
kernel 1.0.14rc3.
Problem: when I try to use ch34 I get this:
$ aplay -D ch34 sound.wav
ALSA lib pcm_direct.c:1464:(_snd_pcm_direct_get_slave_ipc_offset)
Invalid type 'dshare' for slave PCM
aplay: main:546: audio open error: Invalid argument
my hardware:
$aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: V8237 [VIA 8237], device 0: VIA 8237 [VIA 8237]
~ Subdevices: 3/4
~ Subdevice #0: subdevice #0
~ Subdevice #1: subdevice #1
~ Subdevice #2: subdevice #2
~ Subdevice #3: subdevice #3
card 0: V8237 [VIA 8237], device 1: VIA 8237 [VIA 8237]
~ Subdevices: 1/1
~ Subdevice #0: subdevice #0
In alsamixer I set the channel to 4 ch. and see this:
$ aplay -L
default:CARD=V8237
~ VIA 8237, VIA 8237
~ Default Audio Device
front:CARD=V8237,DEV=0
~ VIA 8237, VIA 8237
~ Front speakers
surround40:CARD=V8237,DEV=0
~ VIA 8237, VIA 8237
~ 4.0 Surround output to Front and Rear speakers
surround41:CARD=V8237,DEV=0
~ VIA 8237, VIA 8237
~ 4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=V8237,DEV=0
~ VIA 8237, VIA 8237
~ 5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=V8237,DEV=0
~ VIA 8237, VIA 8237
~ 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
iec958:CARD=V8237,DEV=0
~ VIA 8237, VIA 8237
~ IEC958 (S/PDIF) Digital Audio Output
null
the only way I may hear anything from the line-in/rear connector is when
running this:
$ aplay -D plug:surround40 sound.wav
I tried this in my .asoundrc file:
pcm_slave.via4 {
~ pcm "hw:0"
~ channels 4
}
pcm.ch12 {
~ type dshare
~ slave via4
~ ipc_key 47110815
~ ipc_key_add_uid no
~ bindings {
~ 0 0
~ 1 1
~ }
}
pcm.ch34 {
~ type dshare
~ slave via4
~ ipc_key 47110816
~ ipc_key_add_uid no
~ bindings {
~ 0 2
~ 1 3
~ }
}
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