Comment # 21 on bug 1047729 from Takashi Iwai

(In reply to P. Otato from comment #20)
> (In reply to Takashi Iwai from comment #18)
> > OK, then let's close this bug as the crash at PM was fixed, while tracking
> > the graphics glitches in another bug.
> Thank you very much for your help, I really appreciate it!
> 
> I've just found this thread:
> https://bbs.archlinux.org/viewtopic.php?id=224098
> 
> Takashi Iwai, could you take a quick look at this, especially the last post
> which links to a Kernel patch?

That's the same commit as I backported.
e8a9c58fcd9a5081f71f57f370af1347ed6a310b
  drm/i915: Unify active context tracking between legacy/execlists/guc