Since I’ve bought my GTX 650 Ti Boost it happens that the system hangs and freezes
when Powermizer changes the performance level.
The only workaround I’ve found is to force maximum performance in the xorg.conf.
I’ve waited for six months that, maybe in new releases of the driver, things would have changed, but it didn’t happened.
Nvidia Drivers: 331.38
Output of dmesg when this happens
[ 136.824376] NVRM: GPU at 0000:01:00: GPU-a12077ac-3bb8-2582-b3a2-6adb94b48877 [ 136.824384] NVRM: Xid (0000:01:00): 8, Channel 00000001 [ 138.827969] NVRM: os_schedule: Attempted to yield the CPU while in atomic or interrupt context