(In reply to Pierre Moreau from comment #49)

> My patch wasn't merged into 3.17 as it was a bit too short before the
> release, plus it didn't had time to be properly tested on other machines to
> check if it didn't introduce some regressions; I'll use the extra time to
> reverse-engineer the registers I modify. However it should be able to go
> into 3.18 if reverse-engineering goes well.

I would LOVE to see a fix for this merged into 3.18. Please let me know if I
can help at all. I have a MacBook Pro 5,1 that exhibits this bug.