[Bug 84744] ZaphodHeads need O_NONBLOCK suppor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84744

--- Comment #15 from M. G. <gentoo at gishpuppy.com> ---
(In reply to Chris Wilson from comment #13)
> Oh, ZaphodHeads! Sorry, completely misinterpretted dual-head configuration.
> Known issue in the drm module.

Is dual-head the wrong term for this configuration? Sorry, English is not my
native language.

(In reply to Chris Wilson from comment #14)
> Created attachment 107492 [details] [review]
> O_NONBLOCK support on /dev/dri/cardN

Great, many thanks! This fixes the freeze. However, if I play the video on the
second screen (DISPLAY=:0.1 mpv --hwdec=vaapi --vo=vaapi video.mp4) the
X-Server crashes and I only see a blank screen with a static cursor (not
blinking) in the left top corner on both displays. I will attach the
Xorg.0.log.

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