I can confirm that installing linux-backports-modules on my first- generation MacBook (Core Duo, not Core 2 Duo) seems to solve the left- channel-distortion issue.
However, the master volume still doesn't function (I have to use the PCM or Surround channel to control the volume). -- left-channel distortion on intel-hda https://bugs.launchpad.net/bugs/75906 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