When I run with desktop effects turned off things actually run quite nicely. No problems. However, if I turn on the desktop effects I can use the system for 5-30 minutes before it freezes. Most of the time my mouse moves but that is it. keyboard is dead. I can ssh in from another machine and I see xorg is running at 100%. It does respond to a reboot command.
While this is reported against Ubuntu, I am experiencing the same thing in Kubuntu. I have a dual monitor system with nvidia drivers:
$ cat /proc/driver/ nvidia/ version
NVRM version: NVIDIA UNIX x86_64 Kernel Module 295.53 Fri May 11 23:28:10 PDT 2012
GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
$ lspci | grep -i nvidia
02:00.0 VGA compatible controller: NVIDIA Corporation G86 [Quadro NVS 290] (rev a1)
When I run with desktop effects turned off things actually run quite nicely. No problems. However, if I turn on the desktop effects I can use the system for 5-30 minutes before it freezes. Most of the time my mouse moves but that is it. keyboard is dead. I can ssh in from another machine and I see xorg is running at 100%. It does respond to a reboot command.