[Bug 89904] [IVB] intermittent return from blank shows non-rotated monitors glitch

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89904

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, I noticed that it wasn't taking account of the rotation flag when choosing
the initial contents for the scanout when waking up - so it was copying the
frontbuffer without rotation onto the RandR shadow scanout before binding it to
the CRTC. We did promptly try to redisplay the outputs (~16ms later but that is
mostly due to the verbosity of the logging and CRTC enabling), but

[  2535.903] sna_mode_redisplay: shadow idle, skipping update

so that means the unrotated content would persist until redraw. I believe I
understand the problem correct (kudos for getting the right bit of the log!):

commit e74ff581449e92d7933da1b5df6680cb880fc454
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Apr 6 13:58:35 2015 +0100

    sna: Force the TearFree redisplay when populating a rotated configuration

    We have to disable the "shadow idle; skipping" test if the CRTCs are
    showing stale content following a sna_crtc_attach().

    Reported-by: Chris Bainbridge <chris.bainbridge at gmail.com>
    References: https://bugs.freedesktop.org/show_bug.cgi?id=89904
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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