The Mac Pro and Macbook Pro issues aren't related (they use different sound chipsets).
I originally reported the issue to the ALSA developer list, and received a patch. A Mac Pro driver fix is included in ALSA 1.0.14rc2 (but this version requires a "model=macpro" module argument). 1.0.14rc3 detects the Mac Pro (and sets the mixer channels correctly) out-of-the-box. I have not verified that the changes pushed towards Linus and the kernel mailing list actually include the Mac Pro fix, but the correct description is present in the changes. -- Sound not working well on Apple Mac Pro https://launchpad.net/bugs/89980 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
