[Bug 96767] ThinkPad T450: RetroArch refuses to go back into windowed mode after fullscreen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96767

--- Comment #27 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Diego Viola from comment #26)
> (In reply to Chris Wilson from comment #14)
> > The chvt will cause a modeset which will flush the vblank queue (more
> > evidence that is a "lost" event in the kernel as opposed to userspace
> > missing the event enitrely). This will be very noisy, but I wonder if a
> > drm.debug=0xff dmesg will have a clue (you will probably also need to
> > increase the dmesg to say log_buf_len=10M) when you hit the hang and then
> > chvt.
> 
> Chris, you mentioned this was a possible kernel bug, but I got that commit
> that is causing this in xf86-video-intel.
> 
> Do you have any suggestions please?

I've run over 96hours on xf86-video-intel/test/dri2-race that captures all of
the issues you have hit so far and more. Both xorg-1.18.0 (as demonstrated
earlier and fixed) and xorg-1.19-rc are buggy. That change just moves a
spurious early signal to the later pending flip, i.e. expanding the race
window. It is not the culprit you think it is.

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