The sound chip is Intel HDA, ALC260. I have tried setting
options snd-hda-intel model=fujitsu
in /etc/modprobe.d/alsa-base.conf, but this hasn't made any difference.
There is no "Jack Sense" option in alsamixer. I've also tried a couple of
values for fix_position.
I've tried following the ubuntu wiki pages for Intel HDA and sound debugging
in general, to no avail. When doing the jack sense test recommended on
https://wiki.ubuntu.com/ALSA/JackSense the two files generated with and
without the headphones plugged in were identical. This makes me think it is
a driver problem. I pasted the output of `cat /proc/asound/card*/codec*` at
http://pastebin.com/4NyvdsXf in case this is of any help.
Really stumped, so thanks for any suggestions.
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