@Nigel Do you have linux-backports-modules-alsa-karmic-generic installed? Can you verify that you still need your probe_mask and other parameter additions to snd-hda-intel in /etc/modprobe.d/alsa-base.conf?
@Nigel Do you have linux-backports -modules- alsa-karmic- generic d/alsa- base.conf?
installed? Can you verify that you still need your probe_mask and
other parameter additions to snd-hda-intel in
/etc/modprobe.