Created attachment 125226 [details]
Photograph of screen when the problem occurs
This is an odd one, as of posting I have only managed to reproduce this when
using a Virtual Programming OpenGL 3.2 based game, such as The Witcher 2. I
have not been able to reproduce it with Valve's Source games.
For example, If you run The Witcher 2 in windowed mode, and allow it to get=
to
the menu screen, doing anything with another window (such as resizing) caus=
es
the display to turn to junk. Eventually the whole X11 display will be corru=
pt,
and only rebooting the system will clear it. Text mode TTY's are unaffected.
Occasionally, rather than corruption, the system will lock up, requiring a =
hard
reset or magic sysrq reset. I could not find a way to consistently reproduce
this though, whereas I can consistently reproduce the corruption.
Specs:
Xubuntu 16.04.1 LTS
Kernel 4.0.0-31-generic, x86_64
Mesa 12.1.0-devel (Padoka PPA)
DRM 2.43.0
GPU Radeon HD 7750 (CAPE VERDE PCI 1002:683F), 1GB VRAM
Xorg 1.18.3
Desktop Xfce4 4.12, using builtin compositor
Disabling the compositor makes no difference. Restarting Xorg when the fault
occurs makes no difference.
The bug is not present in the 11.2.0 release of Mesa shipped with Ubuntu 16=
.04
by default.