Add snd-intel8x0m to /etc/hotplug/blacklist and reboot. There seems to be a
conflict between the sound and this modem driver in this kernel version. But of
course you cannot use the modem and the alternate sl-modem driver (in
multiverse, but you need the daemon for the alsa driver anyway) doesn't work
with this kernel (it compiles but insmod fails).
Solved!
Add snd-intel8x0m to /etc/hotplug/ blacklist and reboot. There seems to be a
conflict between the sound and this modem driver in this kernel version. But of
course you cannot use the modem and the alternate sl-modem driver (in
multiverse, but you need the daemon for the alsa driver anyway) doesn't work
with this kernel (it compiles but insmod fails).