http://git.alsa-project.org/?p=alsa- kernel.git;a=blob_plain;f=Documentation/sound/alsa/SB-Live-mixer.txt
Some SB Live have I2S DAC which does not has any volume control, the driver use the FX-bus accumulators "Wave" , "Wave Surround" playback volume control seem affect stream using "hw" device (i.e. analog mono profile or any alsa application using device 0) while "front" and "Surround" playback volume control affect stream using "front" , "surround40" name='Wave Playback Volume',index=0 This control is used to attenuate samples for left and right PCM FX-bus accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples. The result samples are forwarded to the front DAC PCM slots of the AC97 codec. name='Wave Surround Playback Volume',index=0 This control is used to attenuate samples for left and right PCM FX-bus accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples. The result samples are forwarded to the rear I2S DACs. These DACs operates separately (they are not inside the AC97 codec). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/832184 Title: [SB Live! Value [CT4832]] Changing front output volume affects rear output volume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/832184/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
