[Bug 236003] x11-drivers/xf86-video-intel: update to 2020-04-21 snapshot and refactor

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236003

--- Comment #49 from Taku YAMAMOTO <taku at tackymt.homeip.net> ---
First of all, I'm glad that you haven't lost your attention on this topic!

(In reply to Jan Beich from comment #47)

> > It appears that Xorg begins either spinning inside drm ioctl or
> > hopping U-K back and forth after massive texture operations.
> 
> Does it happen as soon as Xorg is started? If not which application causes it.

No, Xorg starts and works as normal until I start playing some videos (firefox,
mplayer -vo xv or -vo gl) and keep watching for a few minutes.
The duration until Xorg gets stuck varies from time to time.

> What's U-K? What do you mean by hopping? CPU usage spikes in top(1)?

Sorry for unclear wording.
I mean that Xorg seems to call ioctl either too frequently or ioctl busy-loops
inside drm (I'm not certain).

> Did you see anything unusual in Xorg.log? Mainly look for (EE) lines.

Nothing special.

> Does enablig DRI3 in xorg.conf help? xf86-video-intel defaults to DRI2 unlike modesetting.

I never thought xf86-video-intel still defaults to DRI2!
I'll test the v7.3 with DRI3 enabled first, then will try v8.

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