Created attachment 102434 [details]
kernel messages
Tried running Unreal Engine 4 demos from
https://wiki.unrealengine.com/Linux_Demos
'Mobile Temple Demo' started, worked bad (image was too dark, possible to see
almost nothing), but did not crash anything.
Next tried 'Effects Cave Demo': in a few seconds after first start of demo X
server became not responding (not even possible to switch with ctrl+alt+f1), it
was flickering between grey fill and normal desktop (seems kernel tried to
restart GPU), then system became fully unresponsive: ssh did not work, power
button did not send system to suspend. Attached kernel messages saved by
syslog.
I never had GPU related stability problems with 3.12.x-3.14.x kernels before:
several opengl 3d games worked fine, opengl based mpv video output worked fine,
glxgears and stellarium worked fine too.
Did unreal engine try to use some non implemented or unstable features? Why
kernel allowed to crash itself instead of killing userspace app?
Hardware: Radeon HD 6770
Software: Gentoo hardened amd64 stable, kernel-3.14.10, libdrm-2.4.54,
mesa-10.2.2, llvm-3.3, xf86-video-ati-7.3.0, xorg-server-1.15.0