[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 #37 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #36)
> Chris,
> 
> I put some log files here:
> 
>     http://data.boulder.swri.edu/~joe/
> 
> Xorg.0.log and Xorg.0.log3 both happened with TearFree on using the Spotify
> search test.  I fear not much of use is in these, but please look (I looked
> at the tail of each).

You underestimate the value of your debugging - it was very, very useful. Thank
you.

commit 4b73a0ea22b43807c0118f4d7e9dcac3f0626463
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jan 29 05:32:25 2014 +0000

    sna: Skip undamaged TearFree redisplays

    If we have not had cause to flush the wait_for_shadow buffer during the
    course of the rendering, then we never wrote to the backbuffer and its
    contents are still identical to the current frontbuffer. So if the
    wait_for_shadow is still flagged as required on the scanout, we know we
    can safely discard the redisplay request.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=70905
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Time to try again!

> 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...

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