Multiple times now I've had graphical glitches leading into a complete system lock of Ubuntu when running DotA 2 with the proprietary nvidia drivers on Ubuntu 14.04. The same thing doesn't happen when running Windows 10. I've also tried with the nouveau drivers from xorg-edgers but couldn't reproduce the bug, but then again it didn't clock up the graphics card from 100MHz and produced about 1fps.
Attached is the nvidia-report-bug-zip produced just after the crash by ssh:ing into the machine and using their tool. I'm also attaching the plain xorg.log for one of the crashes.
When the crash happens the machine becomes completely unresponsive to mouse and keyboard input, ctrl-alt-f1 doesn't have any effect which it usually does. When ssh:ing into the machine I can with htop see that Xorg is consuming all the cpu cycles of one core. I'm also unable to sudo pkill -9 X, it stays running and eventually the whole OS crashes.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: nvidia-346-updates 346.96-0ubuntu0.0.1
ProcVersionSignature: Ubuntu 3.13.0-65.106-generic 3.13.11-ckt26
Uname: Linux 3.13.0-65-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.15
Architecture: amd64
Date: Sat Oct 17 10:41:40 2015
EcryptfsInUse: Yes
ProcEnviron:
TERM=rxvt-unicode
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=sv_SE.UTF-8
SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers-346-updates
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.modprobe.d.nvidia.346.updates.hybrid.conf: [deleted]
Updated the BIOS version on my mother board and played two more games, have yet to crash again. Will report back in two weeks with more info.