[alsa-devel] Sound distortions with Realtek ALC889A

Matthias Dahl ml_alsa at mortal-soul.de
Thu Jul 3 13:15:17 CEST 2008


Due to a hw defect, I recently bought a Gigabyte X48-DQ6 board which utilizes 
a Realtek ALC889A for sound output. At first glance everything seemed fine 
but during day-to-day use I figured that during playback of a 5.1 file, I've 
to turn up the volume quite a bit to match normal 2.0 playback or the volume 
levels of my old board (ADI1988B). And to make matters worse, the surround 
channel produces (static) noise on the center channel. If I mute every 
channel but the surround channel, the distortions are clearly hearable. 
During normal 5.1 playback, they are only hearable during scenes with a lot 
of talk or quieter scenes which is still very annoying unfortunately. Muting 
the surround channel also stops the distortions on the center channel.

Also the model is not properly recognized, I've to pass model=6stack-dig to 
get all channels properly working with digital out.

By the way, this is with a 2.6.26-rc7 x86_64 kernel running a alsa git 
checkout from last monday.

I'd appreciate any help or hints I can get. Thanks in advance.

Best regards,
Matthias Dahl
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