[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

Samy Mahmoudi <samy.mahmoudi at gmail.com> changed:

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                 CC|                            |samy.mahmoudi at gmail.com

--- Comment #52 from Samy Mahmoudi <samy.mahmoudi at gmail.com> ---
Hi,

I had set Option "DRI" "3" on two systems (Sandy Bridge, Ivy Bridge) without
setting LIBGL_DRI3_ENABLE properly. I recently upgraded the Ivy Bridge system,
so that the recent changes in graphics/mesa-libs triggered DRI 3 activation.
Here's what now happens:

After some inactivity, pressing a key powers on the monitor but the screen
keeps displaying a previous state which is anterior to the last state I let the
system in before being inactive (on the Ivy Bridge system, that screen is the
SLiM login manager background picture). Mouse cursor moves are still visible,
keyboard presses and mouse events are still received, but nothing renders on
screen: I can continue to use the system but can not see what happens. The only
way to resume normal rendering is to move my mouse to a corner which activates
the Compiz plugin Exposé or to switch between workspaces with another Compiz
plugin via a key combination. 

By trial and error on the two systems, I have come to the conclusion that this
non-critical problem only happens with the combination of intel and DRI 3 and
Compiz.

By the way, I noticed the Sandy Bridge system shows 8200 FPS in glxgears,
whereas the Ivy Bridge system (HD 4000, xorg-server-1.20.8,1 and
mesa-dri-18.3.2_10) only shows 7600 FPS. I need to upgrade the Sandy Bridge
system to see if it keeps an advantage over the Ivy Bridge system. If it does
not, that would possibly mean that a performance regression happened somewhere.

The Sandy Bridge system:
ThinkPad T520, HD 3000, 12.0-R with xorg-server-1.18.4_11,1 and
mesa-dri-18.3.2_3

The Ivy Bridge system:
Optiplex 7010, HD 4000, 12.1-R with xorg-server-1.20.8,1 and mesa-dri-18.3.2_10

Keep up the great work Jan!

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