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).
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).