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

bugtrack
2006-01-04T16:40:29Z

Last Modified: 01-04-2006 17:40 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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Dr Hotdog - 12-31-05 17:30
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I can confirm the problems with the ASUS A8N-VM CSM and its AD1986A sound
chip. Kernel 2.6.15rc7 with ALSA 1.0.11rc1 hda-intel results in high
pitched squealing from the front left speaker whenever there is sound
being played over any channel. Results of using speaker-test are the same
as those reported by kees for the ASUS A8N-VM-UAYGZ mobo.

lspci -nvv:

00:10.1 Class 0403: 10de:026c (rev a2)
Subsystem: 10de:cb84
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (500ns min, 1250ns max)
Interrupt: pin B routed to IRQ 233
Region 0: Memory at febd8000 (32-bit, non-prefetchable)
[size=16K]
Capabilities: [44] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [6c] HyperTransport: MSI Mapping

head /proc/asound/card0/code#0:

Codec: Analog Devices AD1986A
Address: 0
Vendor Id: 0x11d41986
Subsystem Id: 0x104381b3
Revision Id: 0x100400

Unfortunately I am interested in surround sound (this is a motherboard
designed with HTPC use in mind, stereo only output just doesn't cut it) so
the patch morgoth666 linked to is an incomplete solution at best.

EDIT:

In addition, sound will stop working entirely and apparently randomly,
reboot is the only way to restore it. Nothing in dmesg or
/var/log/messages when this occurs. After this happens speaker-test will
run as normal, without error messages, but no sound is heard. Possibly
related to bug #1415, however there is no obvious correlation with volume
adjustments, volume adjustments can be made without failure of the sound
system and the sound can fail at other times when no volume adjustments
are being made.

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tiwai - 01-04-06 17:40
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Could you try ALSA 1.0.11rc2?