[alsa-devel] Noise on rear speaker when switching from 2.0 to 5.1 sound

Takashi Iwai tiwai at suse.de
Mon Aug 6 14:07:54 CEST 2007

At Sat, 4 Aug 2007 20:19:04 +0200,
Felix Rauscher wrote:
> Hello,
> I have a Hercules Muse 5.1 DVD (C-Media PCI CMI8738-MC6). I have a problem 
> when a running xine (e.g xineliboutput from vdr) switches from 2.0 to 5.1 
> output. Then the sound quality of the rear speakers is terrible. There is a 
> noise on the rear speakers.
> If I start the xineliboutput-client when vdr already plays a programme with a 
> 5.1 sound track, the quality is ok. It looks like the switching between 2.0 
> to 5.1 is a problem. 

So far, I have no clue what could be wrong there.
Maybe you can see significant difference in /proc/asound/card0/cmipci
proc file between the working and the non-working states.


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