2015-01-14 21:16 GMT+01:00 Tanu Kaskinen <tanu.kaskinen at linux.intel.com>: > On Mon, 2015-01-12 at 14:42 +0100, Martin Klein wrote: >> 2015-01-09 12:59 GMT+01:00 Tanu Kaskinen <tanu.kaskinen at linux.intel.com>: >> > It sounds like the surround51 alsa device isn't working as it should. >> > What if you try "speaker-test -D surround51:0 -c 6 -t wav"? Does it work >> > as expected? >> > >> This is working as expected (i.e. the from the rear output I hear >> "rear left, rear right" and from my front output I hear "front"). >> However, changing the volumes of rear in pavucontrol still doesn't >> change anyting. Changing the volume of front effects all output >> channels. In alsamixer, changing the volume of rear and front works as >> expected. > > I suggest that you don't think too much about the volume controls at > this point, because volume control can contain extra complications. > > If speaker-test -D surround51:0 works, then it indeed appears to be a > problem in pulseaudio. What if you don't load the remap sinks, and just > try to play noise to the different channels of the alsa sink like this: > > pacat --volume=1000 --no-remix --channels=1 --channel-map=front-left /dev/urandom > > (I set the volume to a relatively low value, because the noise can be > pretty loud.) > > Try that command with different channel maps. Always specify just one > channel of the 5.1 setup. There should be noise from only one channel, > and if the specified channel is e.g. "rear-right", you of course should > hear the noise from the rear right speaker. Does it work? > Okay, this works as expected, i.e. I hear the noise on the intended speaker. Thank you for suggesting this test. Now to summarize: In principle surround seems to work with both Alsa and Pulse (i.e. I can output sound on only the intended speaker). However, both volume controls and module-remap-sink does not work for the surround channels with pulseaudio. Any ideas on how to debug this further?
