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 Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1192458 Title: [USB-Audio, playback] 4-channel mode don't work on E-MU 0204 USB Status in “alsa-driver” package in Ubuntu: Confirmed Bug description: On E-MU 0204 USB only 2-channel mode worked. In this mode the second pair of channels just duplicates the output of the first pair. E-MU control panel under MS Windows allow to switch to 2-channel or 4-channel mode. I ran USB sniffer, and it shows switch commands that the system send to the device: ====================================== Host send 2 bytes to device: Request: 0x1 Value: 0x400 Data: 01 01 //switching to 2-channel mode Data: 01 02 //switching to 4-channel mode ====================================== Looks like in Ubuntu the card by default stay in 2-channel mode. Switching to 4-channel mode apparently can be added to quirks.c DistroRelease: Ubuntu 12.10 Package: alsa-base 1.0.25+dfsg-0ubuntu4 Uname: Linux 3.9.6-030906-generic x86_64 Architecture: amd64 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1192458/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
