Comment 6 for bug 680844

I configured Ubuntu 10.10 Maverick 64-bit on a Toshiba Satellite L655-S5115 laptop with Conexant CX20585 audio for a friend. In addition to the headphone jack not working, the built-in microphone and microphone jack did not work. Upgrading to the alsa daily build did not fix everything. I tried the Natty 64-bit alpha1 and the same problems persist. Using the model=ideapad work-around fixed the headphone jack and built-in mic, but not the microphone jack.

Fortunately, I was able to get all the audio issues fixed by adding "options snd-hda-intel model=thinkpad" to /etc/modprobe.d/alsa-base.conf

I also posted this here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/680844