[Bug 236003] x11-drivers/xf86-video-intel: update to 2019-07-10 snapshot and refactor

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

Theron Tarigo <theron at freebsd.org> changed:

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                 CC|                            |theron at freebsd.org

--- Comment #18 from Theron Tarigo <theron at freebsd.org> ---
(In reply to Jan Beich from comment #0)
Hi, I should have been paying attention to this bug by now, since I have
Intel(R) HD Graphics 530 (Skylake GT2).  With what has been available in ports,
everything since DRM 4.9 kmod (drm-fbsd11.2-kmod-4.9g20181023) has been
unusable: With "intel" driver and SNA+TearFree, after a few minutes of Xorg
running, or even after launching Firefox, performance becomes terrible, where
it feels as though in each 1/60th of a second, there is only a one in three
chance of a frame getting pushed to the display).  "modesetting" has never
worked for me with any drm-kmod without tearing, so I do not use it.  Here I
thought I was the only user of Intel HD530 and the only one stuck on DRM 4.9. 
Jan, has this been your experience with "intel" driver?  Is this one thing that
the update fixes?

As long as DRM 4.9 continues to build and run on FreeBSD 12.x I haven't been
able to justify putting enormous time into debugging the newer graphics stack,
but it sounds like this update may be the fix; I can't tell.  (If you'd rather
I just try it than ask questions then that is an option for me but it may delay
my willingness to test it indefinitely).

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