I also saw another bug report, which initially is about a different issue concerning the sound, but in the last posts users also report that the headphones are not working.
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/136469
I also saw another bug report, which initially is about a different issue concerning the sound, but in the last posts users also report that the headphones are not working.
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux-source- 2.6.22/ +bug/136469