I can confirm this fwupd issue for a different USB audio device, a PreSonus AudioBox 1818 VSL.
When I connect the card I get this in /var/log/syslog [1] [2]: Apr 24 15:41:47 yogamme kernel: [ 34.958299] usbcore: registered new interface driver snd-usb-audio Apr 24 15:41:47 yogamme org.freedesktop.fwupd[706]: (fwupd:1806): As-CRITICAL **: as_store_get_app_by_provide: assertion 'value != NULL' failed Apr 24 15:41:47 yogamme systemd-udevd[2129]: Process '/usr/sbin/alsactl -E HOME=/run/alsa restore 2' failed with exit code 99. Apr 24 15:41:50 yogamme gnome-session[1421]: (gnome-software:1739): Gs-WARNING **: failed to get updates: no results to show Apr 24 15:41:52 yogamme kernel: [ 39.853364] usb 1-1.2: 2:2: cannot set freq 44100 (v2): err -110 Apr 24 15:41:52 yogamme kernel: [ 39.878675] usb 1-1.2: 2:2: usb_set_interface failed (-71) Apr 24 15:41:52 yogamme kernel: [ 39.882926] usb 1-1.2: 2:2: usb_set_interface failed (-71) Apr 24 15:41:52 yogamme kernel: [ 39.887176] usb 1-1.2: 2:2: usb_set_interface failed (-71) ... Running `alsamixer` and selecting the USB sound card causes alsamixer to abort with a "protocol error". If I do `sudo killall fwupd` and reconnect the USB sound card, everything works fine. It seems that fwupd is interfering with ALSA gaining control of the sound card. [1]: My Thinkpad Yoga 14 laptop has USB 3.0 ports, but one can force them to behave as 2.0 ports via a BIOS/UEFI setting. The syslog excerpt is for USB 2.0 mode; in 3.0 mode an additional log message mentioning "URB transfer length is wrong, xHC issue?" appears among the usb_set_interface messages. [2]: The gnome-software warning *is* related to fwupd - https://github.com/hughsie/fwupd mentions GNOME software as "the only graphical frontend available" for fwupd at present. ** Also affects: fwupd (Ubuntu) Importance: Undecided Status: New ** Changed in: alsa-driver (Ubuntu) Status: Confirmed => Invalid ** Changed in: fwupd (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1574079 Title: USB audio device is not recognized after startup in 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1574079/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
