In order to try and compare why the live cd 12.04.3 works, I booted into it (where the sennheiser works fine) and took the following traces to help compare with the installed 12.04.3 which does not work:
lsusb -vvv output: http://paste.ubuntu.com/6707885/ dmesg trace after boot: http://paste.ubuntu.com/6707904/ udevadm info -a -p http://paste.ubuntu.com/6707908/ /usr/share/alsa/cards/USB-Audio.conf http://paste.ubuntu.com/6707914/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1266343 Title: Sennheiser USB headset not listed as device in aplay -l To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1266343/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs