Public bug reported:
Binary package hint: linux-image-2.6.22-14-generic
Using 4ch or 6ch mode on Gutsy with the Asus K8N-VM motherboard onboard
audio (nvidia MCP-51 chipset) results in a high pitched whine on both
the front and rear left channel speakers. Right and center channels are
unaffected. The device is listed as AD198x Analog and is using the snd-
hda-intel driver. Googling around turned up similar issues with other
nforce boards, but all were solved by using one of the following lines
in /etc/modprobe.d/alsa-base:
options snd-hda-intel index=0 model=3stack position_fix=0 single_cmd=0
options snd-hda-intel position_fix=1 model=3stack
options snd-hda-intel model=3stack
options snd-hda-intel model=auto
I have tried all 4 variations with a reboot in between, and still get
the high pitched whine. Using 2ch mode eliminates the problem, but
means that 5.1 sound doesn't work. I have tried muting and unmuting
various combinations of channels and altering levels, none of which has
any positive impact. Additionally, adjusting any level while sound is
being played results in the audio output abruptly dying (I was using the
test under System->Preferences->Sound). The only fix is to stop any
application using the device and adjust the main audio level on the
system tray applet, which seems to restore sound.
$ tail -2 /proc/asound/oss/sndstat
Mixers:
0: Analog Devices AD1986A
Will attach debugging outputs. This bug is similar to #89036 and
#90303.
** Affects: linux-source-2.6.22 (Ubuntu)
Importance: Undecided
Status: New
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High pitch whine on left audio channel with Asus K8N-VM
https://bugs.launchpad.net/bugs/156540
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