[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 #31 from Diego Viola <diego.viola at gmail.com> ---
(In reply to Diego Viola from comment #30)
> (In reply to Chris Wilson from comment #27)
> > (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.
> 
> I think you're right, I went back to Aug. 2015 and I still get these hangs,
> going back further I get compile time errors and I can't test anymore.
> 
> It's interesting though that some of those commits are OK and don't hang.
> I'm out of ideas. :(

Yes, I realize it's a bug in the kernel, and it sucks nobody is doing anything
about them.

What I'm saying is that maybe you'll be able to alleviate by using
modesetting/glamor as it probably uses different functions than
xf86-video-intel.

Although that is more of a workaround right now, and it has worked for me.

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