post the output of alsa-info.sh https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/792528
Do you have the "PCM playback Volume" ? Simple mixer control 'PCM',0 Capabilities: pvolume pswitch pswitch-joined penum Playback channels: Front Left - Front Right - Rear Left - Rear Right Limits: Playback 0 - 200 Mono: Front Left: Playback 200 [100%] [0.00dB] [on] Front Right: Playback 200 [100%] [0.00dB] [on] Rear Left: Playback 200 [100%] [0.00dB] [on] Rear Right: Playback 200 [100%] [0.00dB] [on] https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/usb/pcm.c Do your command used for the setup of stereo stream and quad stream in set_format() if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, hw_rule_channels, subs, SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_RATE, param_period_time_if_needed, -1)) < 0) are those channels_max is 4 and channels_min is 2 when add the rule for channels -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1192458 Title: [USB-Audio, playback] 4-channel mode don't work on E-MU 0204 USB To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1192458/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
