Comment 11 for bug 538383

@ Jimi - You may be interested in comment 18 at bug 522982. Note that the linux-alsa-driver-modules-xxx in that ppa does not remain frozen at 1.0.23, but is update daily, which means there is the possibility to introduce new bugs in the form of regressions or instability.

You may also be interested in the comments at bug 557742 - Jerone Young is pushing to try and get this into the alsa-backports package in 10.04. He has also created a dkms package to resolve this issue however he has subsequently advised not to use the dkms package, but wait for alsa-backports, as apparently the dkms package conflicts with the thinkpad-acpi module.