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Old 06-21-12, 04:44 AM   #8
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Join Date: Jun 2012
Posts: 6
Default Re: GT650M not recognized by 295.59 Driver on Ubuntu 12.04

If, like balgo, you have "GPU has fallen off the bus" message earlier in dmesg, try running some CUDA application before optirun. You will need to power on the card and create device files prior to running a CUDA program:
sudo tee /proc/acpi/bbswitch <<<ON
sudo mknod -m 666 /dev/nvidiactl c 195 255
sudo mknod -m 666 /dev/nvidia0 c 195 0
sudo modprobe nvidia
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