During the present unflip path we blindly try to restore the original
mode after a flip failure. However, it confuses flipping zero CRTC with
a genuine failure. This has the result of undoing a DPMS change (e.g.
xset dpms force dpms) under a DRI3 compositor.
Reported-by: Jiri Slaby <jirislaby@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81456
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>