It appears that the problem may have been in part due to the fact that I had manually installed the 1.0.13 Alsa drivers from source. When I installed the 1.0.14 drivers from source, the problem went away, which corresponds to the solution that other people in the forums are reporting as having worked.
-- Latest updates for Edgy broke my sound (HDA Intel) https://bugs.launchpad.net/bugs/106755 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
