@Julian: Thank you very much, your comment most probably contains the solution for this bug.
I just re-tested all combinations: kernel 2.6.32-27 without alsa-backports: HDMI sound does NOT work. kernel 2.6.32-27 with alsa backports: HDMI sound DOES work. kernel 2.6.32-33 without alsa-backports: HDMI sound does NOT work. kernel 2.6.32-33 with alsa backports: HDMI sound DOES work. (The hack described in my previous post was not needed.) > If the 2.6.32-28 kernel update didn't come with the corresponding linux-backports-modules-alsa-$version package, a change in audio behaviour sounds reasonable. As far as I can see: That's it! According to my Synaptic chronics, on 2011-01-27 01:15 indeed only linux-image-* but not linux-backports- modules-alsa-* were updated to 2.6.32-28. After submitting the bug report above, I reverted to kernel 2.6.32-27 and inhibited any later kernel update by uninstalling all virtual packages depending on the most recent kernel version number. So linux-backports-modules-alsa-2.6.32-28 (which must have been released later) has never been installed on my system. Solution for my problem: Defer all future kernel updates until the corresponding alsa backport update is also available and always install them together. Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/708957 Title: no more hdmi audio output To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/708957/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
