I further investigated this issue. It seems to be a problem of ALSA 1.0.20. It does not distinguish between speaker and front channel, only a front channel is listed for both. The additional headphone channel seems to be used for the docking station.
I updated manually to alsa 1.0.22 and a speaker channel becomes available. The audio control in the panel, however, still sees the old "scenario" of alsa 1.0.20. But at least I can now use the alsamixer in the console to mute the speaker. -- sound output via headphone is not working correctly https://bugs.launchpad.net/bugs/498829 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
