InstallationMedia: Ubuntu 15.04 'Vivid Vervet' - Release i386 (20150422) InstallationDate: Installed on (217 days ago) dev/snd/pcmC1D0p: tobias 1553 F.m pulseaudio NonfreeKernelMo dules: nvidia_modeset nvidia My Hardware (Main-board/CPU) is a bit older (Intel E8400), so could probably be some compatibility issue. Maybe worth to note that I recognized today that fwupd uses continuously 100% CPU load, so I just killed it today. After 2nd time plugging it in again it shows up and works great without any further issues until next restart.

I can workaround this by unplugging it and plugging it in again after Ubuntu booted up (strangely 2 times unplug/re-plug). After upgrading from 15.10 to 16.04 it stopped to work: after start-up it does not show up as an audio device at all (also not recognized by aplay -l). It is supposed to be class compliant and works an all distros flawless (even RPI2 and OSMC). Hi used the same USB audio device in all previous Ubuntu versions (Focusrite Scarlet 2i2). No firmware for DFU has been published to the LVFS yet, so this shouldn't have any regression risk to Ubuntu. The fix is only made to that part of the fwupd stack. If you are applying this upgrade and testing a regression it's important that the device isn't in a bad state to start. Login to Ubuntu session and try to use a USB audio device. High end USB audio devices don't work properly after fwupd is started from gnome-software.

Cambridge audio usb 2.0 driver