also in my case the problem shows both with AC plug in and without. moreover, now the problem is happening always (whenever I reboot or shut down), while previoulsy it didn't happen every time.
the only change I can point at, is having enabled pulseaudio for the whole system, and the pulseaudio applet. i seem to rememeber that I've also seen a problem in killing alsa (a bad command to alsamixer) during a failed shutdown -- my laptop doesn't shutdown or reboot. i've posted an image. https://bugs.launchpad.net/bugs/355054 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