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 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: /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/680844
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