The choppy audio accross all channels seems to have been caused by a bad USB cable. Another cable works and I can hear proper stereo by using the rear outputs 1/L+2/R or the headphone monitor output.
The only thing that seems to be missing is a proper configuration for the card from ALSA (/usr/share/alsa/ucm/ or /usr/share/alsa/cards/, or an special handling in /usr/share/alsa/cards/USB-Audio.conf) so that PulseAudio can pick it up. The following is an excerpt of what I get when running `pulseaudio -k && pulseaudio -v`: I: [pulseaudio] (alsa-lib)utils.c: could not open configuration file /usr/share/alsa/ucm/FCA610/FCA610.conf I: [pulseaudio] (alsa-lib)parser.c: error: could not parse configuration for card FCA610 I: [pulseaudio] (alsa-lib)main.c: error: failed to import FCA610 use case configuration -2 I: [pulseaudio] alsa-ucm.c: UCM not available for card FCA610 I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:hw:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:front:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:hw:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:hw:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:iec958:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:hw:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:front:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:hw:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:surround40:1: Invalid argument I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:surround41:1: Invalid argument I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:surround50:1: Invalid argument I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:surround51:1: Invalid argument I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:surround71:1: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:iec958:1: Invalid argument I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM a52:1 I: [pulseaudio] alsa-util.c: Error opening PCM device a52:1: No such file or directory I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM a52:1 I: [pulseaudio] alsa-util.c: Error opening PCM device a52:1: No such file or directory I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM dca:1 I: [pulseaudio] alsa-util.c: Error opening PCM device dca:1: No such file or directory I: [pulseaudio] (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=1,AES0=4,AES1=130,AES2=0,AES3=2' I: [pulseaudio] (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: [pulseaudio] (alsa-lib)conf.c: Evaluate error: No such file or directory I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM hdmi:1 I: [pulseaudio] alsa-util.c: Error opening PCM device hdmi:1: No such file or directory E: [pulseaudio] module-alsa-card.c: Failed to find a working profile. E: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="1" name="usb-BEHRINGER_FCA610_0x156400d040-00-FCA610" card_name="alsa_card.usb-BEHRINGER_FCA610_0x156400d040-00-FCA610" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes card_properties="module-udev-detect.discovered=1""): initialization failed. I: [pulseaudio] module-udev-detect.c: Card /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/sound/card1 (alsa_card.usb-BEHRINGER_FCA610_0x156400d040-00-FCA610) failed to load module. W: [pulseaudio] module-udev-detect.c: Tried to configure /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0/sound/card1 (alsa_card.usb-BEHRINGER_FCA610_0x156400d040-00-FCA610) more often than 5 times in 10s I: [pulseaudio] client.c: Created 3 "Native client (UNIX socket client)" I: [pulseaudio] protocol-native.c: Got credentials: uid=1000 gid=1000 success=1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1198577 Title: USB-Audio - FCA610, playback Pulseaudio/ALSA fails to detect card To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1198577/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
