I just got a new machine, a dual Opteron 246 w/2GB RAM and IWIll DK8X motherboard. For some reason, my output for headphones only comes out of the right channel. It's running SuSe 9.1 64-bit.

I've tried everything I can think of, including:
-- double checking all physical connections (mobo)
-- reinstalling alsa, all the way up to 1.07rc1
-- checked module installs
-- made almost all possible combinations of changes to alsamixer
-- tried all ac97 quirk bits

Still, I only get one channel sound. The audio card is an AC97 onboard w/SPDIF. Here's some info on the system. One last thing that comes to mind is that the motherboard documentation for hooking up the sound could be wrong. How do I test if the card it outputting both left and right channels out, so I can find out where the problem is?

TIA,

-- Jason

> lspci -vvv
0000:00:07.5 Multimedia audio controller: Advanced Micro Devices [AMD] AMD-8111 AC97 Audio (rev 03)
Subsystem: Iwill Corp: Unknown device 0045
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Interrupt: pin B routed to IRQ 17
Region 0: I/O ports at c800
Region 1: I/O ports at cc00 [size=64]

> lsmod
Module Size Used by
snd_intel8x0 36164 5
snd_ac97_codec 80544 1 snd_intel8x0
snd_pcm 107016 3 snd_intel8x0,snd_ac97_codec
snd_timer 27656 1 snd_pcm
snd 60872 13 snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer
soundcore 12192 1 snd

> cat /proc/asound/devices
0: [0- 0]: ctl
25: [0- 1]: digital audio capture
16: [0- 0]: digital audio playback
24: [0- 0]: digital audio capture
33: : timer

> cat /proc/asound/pcm
00-00: Intel ICH : AMD AMD8111 : playback 1 : capture 1
00-01: Intel ICH - MIC ADC : AMD AMD8111 - MIC ADC : capture 1

> cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.7rc1.
Compiled on Sep 8 2004 for kernel 2.6.5-7.108-smp (SMP).