The pulsemixer workaround works for me, thanks. I can reproduce the problem by changing the the Output Configuration to Analog Stereo input (yes that probably shouldn't be here to select). The problem then persists after a reboot.
OS: Ubuntu 21.10 - Kernel 5.13.0-41 Device: Schiit - Fulla 3 USB Headphone Amp w/ Mic input Only syslog message is: "gsd-media-keys[1761]: Unable to get default sink" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1267866 Title: usb audio: cannot get ctl value: req = 0x81, wValue = 0x0, wIndex = 0x1400, type = 3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1267866/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs