Bug#660111: [3.0 -> 3.1.8 regression] intel ibexpeak hdmi no sound out

[Andres Cimmarusti <acimmarusti@gmail.com>]

Thanks for the git crash course. I did not look at 'git-bisect' too
much. It is more systematic, but how to test each commit confused me
some.

I found the patch that brings about the problem. It turns out it
happened quite early in the 3.1 kernel merge window. This the commit
that changes things:

http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commit;h=76531d4166fb620375ff3c1ac24753265216d579

Which is more elaborate in the alsa-git repo:

http://git.alsa-project.org/?p=alsa-kernel.git;a=commit;h=76531d4166fb620375ff3c1ac24753265216d579

Unfortunately this commit is rather extensive and includes many
changes. I believe alsa-git has the detailed commits leading to this
merge here:

http://git.alsa-project.org/?p=alsa-kernel.git;a=shortlog;h=76531d4166fb620375ff3c1ac24753265216d579

Particularly, I found this commit rather suspicious:

http://git.alsa-project.org/?p=alsa-kernel.git;a=commit;h=4c11398edc19fdd9c651f3ff287cd628fecaf574

I'm not sure how to test each alsa commit individually. I guess I have
to build alsa externally...  Perhaps it's time to send this upstream?

Cheers,

Andres