[alsa-devel] cmipci CMI8738-MC6 - left channel no sound

Colin Guthrie gmane at colin.guthr.ie
Wed Sep 15 17:02:15 CEST 2010

'Twas brillig, and Thomas Corner at 15/09/10 15:42 did gyre and gimble:
>   I've been going around and around on this.  The surround sound 5.1 is
> playing fine except channel 0 (front-left) is playing on the woofer. The 
> card is a Terratec Aureon fun - CMI8738-MC6. I have
> gotten desperate and have tested this card in Windows and was able to
> get it working right there. I have been using speaker-test to
> to test the setup. I am using pulseaudio.
> This is the summary of my results with speaker-test:
> speaker-test -c 6 -D surround51 -t wav
> speaker          output
>   ----------------------
>   front L         silence
>   front R         front R
>   center          center
>   bass            mix of front L + bass
>   surround L      surround L
>   surround R      surround R

Smells like something is messed up with the alsa driver. Someone in
alsa-devel can probably help you best here. Could be a strange mixer
setting but I doubt it.

> I have removed pulseaudio again (recompiled all software with optional
> pulseaudio support without pulseaudio support)  I should be outputting
> directly to alsa and the driver now.

That is massive overkill. I'd just stick with your distro's packages
rather than recompiling everything and disabling PA support.

The speaker test using the names surround* etc. do not use pulseaudio

> Under pulseaudio speaker-test gives error messages when surround40 and
> surround51 is specified.

This will only be true if pulseaudio daemon is running and has the
device open. Much easier to just run speaker-test as:

pasuspender -- speaker-test -D surround51 ...

than recompiling everything :)

But ultimately it seems to be an alsa problem.

All the best



Colin Guthrie

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