[Bug 107117] mesa-18.1: regression with TFP on intel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107117

--- Comment #16 from Olivier Fourdan <fourdan at xfce.org> ---
(In reply to Denis from comment #15)
> Olivier, could you please advice, how to verify the driver in use?

The DDX can be seen in the Xorg logs, either in
"~/.local/share/xorg/Xorg.*.log" or in "/var/log/Xorg.*.log" depending on your
system.

There, you should see either "modeset" or "intel" depending on which DDX you've
selected in your xorg.conf (or xorg.conf.d/).

e.g. for modesetting:

   (II) modesetting: Driver for Modesetting Kernel Drivers: kms
   (II) modeset(0): using drv /dev/dri/card0

for intel:

   (II) intel: Driver for Intel(R) Iris(TM) Graphics
   (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics
   (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0
20180308
   (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics 4400

Point is, something has changed in Mesa 18.1 which causes attachment 140540 to
render a white window with the Xorg modesetting driver with glamor but not with
the intel DDX, at least on my hardware (using Fedora 28 here with
xserver-1.20)... Many distributions have switched to the modesetting driver by
default with Intel hardware.

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