This problem no longer applies to my laptop running kernel 2.6.22-14-generic.
The only change to my system that was kernel-specific was the update of linux-ubuntu-modules-2.6.22-14-generic -- Kernel 2.6.22-14-generic upgrade breaks video playback https://bugs.launchpad.net/bugs/151414 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs