[pulseaudio-discuss] channel_map problems with alsa

Alex Malinovich demonbane at the-love-shack.net
Tue Feb 13 16:59:12 PST 2007

Ok, so for the first time in about a year I can actually get sound out
of all 4 speakers simultaneously. Yay! But, there's a problem.

I'm using module-combine to combine alsa devices hw:0,0 and hw:0,1. The
front and rear channels, respectively. Unfortunately, when I load
module-alsa-sink for hw:0,1, if I set
"channel_map=rear-left,rear-right", I get no sound. I can still play
sounds to the sink, I just don't hear it. If I leave channel_map alone,
or if I manually map it to either front-left,front-right or left,right
everything works just fine. The problem comes in with how my combined
output behaves.

If I change the rear-left or rear-right volumes for combined, nothing
happens. If I change front-left or front-right volumes, it changes both
of the speakers on that particular side. It's not a problem using things
like audacious, but it could be a problem once I start using things like
mplayer or totem to play DVD's and I suddenly get half of the audio
coming out of twice as many speakers. :) Any suggestions on what I can

Alex Malinovich
Support Free Software, delete your Windows partition TODAY!
Encrypted mail preferred. You can get my public key from any of the
pgp.net keyservers. Key ID: A6D24837

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