[ALSA - driver 0001678]: nForce (10de:026c) left channel squeals, right channel mostly okay

bugtrack
2005-12-31T09:16:56Z

Last Modified: 12-31-2005 10:16 CET
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Summary: nForce (10de:026c) left channel squeals, right
channel mostly okay
Description:
This is an integrated chipset on an ASUS A8N-VM-UAYGZ mobo. Marketing info
is this is an "nForce410" board, with "6-channel HD audio".

Both the ALSA in 2.6.15-rc6-git4 and the 1.0.11rc1 ALSA driver for
snd-hda-intel load fine, but during playback, the left channel squeals,
while the right seems to play things okay.

I'm happy to dig around and try whatever needs trying to get this fixed.
Thanks!
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morgoth666 - 12-30-05 23:50
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Hi all

Just for completeness: I have the same problem on ASUS A8N-VM-CSM mobo
(with AD1986A chip), kernel 2.6.15-rc7, alsa CVS downloaded on Dec,30
2005.

my lspci gives the same as in previous note (with more capabilities !):
0000:00:10.1 0403: 10de:026c (rev a2)
Subsystem: 10de:cb84
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 5
Memory at febd8000 (32-bit, non-prefetchable) [size=16K]
Capabilities: [44] Power Management version 2
Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-
Capabilities: [6c] #08 [a802]

It seems that the problem is related to surround sound: see a quick
workaround here =>
http://www.nabble.com/Intel-HDA-AD1986A-without-surround-t595968.html

Hope this helps !

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kees - 12-31-05 10:16
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Confirmed. My /proc/asound/card0/codec#0 matches:

$ head /proc/asound/card0/codec#0
Codec: Analog Devices AD1986A
Address: 0
Vendor Id: 0x11d41986
Subsystem Id: 0x104381b3
Revision Id: 0x100400

Applying the patch fixes stereo sound -- I'm not interested in digital
surround yet, so I can wait. THANK YOU morgoth666! :) I had found that
patch earlier, but couldn't re-locate later on. :):)