[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 #14 from Chris Wilson <chris at chris-wilson.co.uk> ---
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.

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