Testing the new i915 driver (rev. 3820047)

[Arto Pekkanen]

New information regarding OpenGL application hangs and core dumps.

Procedure
- boot with kernel.i915
   - do not load i915kms at loader
- startx as normal user OR xdm via /etc/ttys, no difference

Tested applications thus far: chrome, openarena, compton.

When I use SNA acceleration, I can get OpenGL applications to work 
without core dumping. Sometimes fullscreen applications cause black 
areas to emerge over regions of other windows, which go away after 
resizing windows or doing something that triggers a redraw (damage 
event, probably).

However, when I use UXA acceleration instead of SNA acceleration (by 
removing my intel specific configuration OR setting UXA directly in 
conf), openarena and compton both crash with core dump. Also, they blank 
the screen, and to get display back I have to vt switch back and forth.

In short, the default UXA acceleration is broken for me in kernel.i915. 
I must use SNA acceleration, which works most of the time, except when 
it glitches so that damaged regions do not get redrawn.

My config for SNA:
# cat <<EOF >/usr/local/etc/X11/xorg.conf.d/10-intel.conf
> Section "Device"
> Identifier "Intel IGP"
> Driver "intel"
> Option "AccelMethod" "SNA"
> Option "TearFree" "true"
> EndSection

I will produce a Test Scenario for this later, but for now I will just 
report my findings.

Jean-Sébastien Pédron kirjoitti 17.10.2015 16:26:
> Hi!
> 
> Lately, I fixed several issues with the GEM, people already reported
> this improved things for them.
> 
> I believe I fixed two problems with the output connectors too and I 
> hope
> that it will be fine now for people who reported eg. non-working HDMI.
> However, I can't test this myself.
> 
> I'm still chasing a problem with Mesa (Stellarium hangs on startup for 
> me).
> 
> As a reminder, informations are available on the wiki:
> https://wiki.freebsd.org/Graphics/Update%20i915%20GPU%20driver%20to%20Linux%203.8
> 
> Please continue to test! Thank you for your help :)

-- 
Arto Pekkanen