[Bug 70905] display turns off with intel(0): sna_mode_redisplay: page flipping failed, disabling CRTC:3 (pipe=0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70905

--- Comment #39 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #38)
> (In reply to comment #37)
> > You underestimate the value of your debugging - it was very, very useful.
> > Thank you.
> 
> Good to know!  :)
> 
> > Time to try again!
> 
> OK, pulled git and rebuilt this morning...  Good news, I think.  New files
> are in the same place:

Heh, apparently '%D' is a typo that we need to be told about at 60Hz.

>     http://data.boulder.swri.edu/~joe/
> 
> > > Xorg.0.log2 happened with TearFree off just going into Chromium - unusual.
> > 
> > Another assertion - not sure which, at a guess it decided the pointer was
> > incoherent, which looks more like a bogus assertion...
> 
> I tried a similar case (starting X and running Chromium with TearFree off). 
> No crash (but maybe that assertion is hard to hit).  Log files named with
> "_noTearFree_chromium".

Had another bug report that revealed I screwed up in one of the patches
yesterday which can explain all manner of strange failures.

> I tried the Spotify with TearFree case, and no crash there, either!  Log
> files names with "_TearFree_spotify".
> 
> I'll keep running with the debug version for a while with TearFree on.  I
> wonder if this last round of changes did the trick - fingers crossed!

*fingers crossed*
Certainly the issue in theory fixed by the patch this morning has the right
hallmarks of being a random, hard to trigger bug that would end up not only
causing the page-flip error but also the blit failure -- i.e. I think it
explains this bug...

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