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which process is using nvidia module?

To: hybrid-graphics-linux@xxxxxxxxxxxxxxxxxxx
From: Albert Vilella <avilella@xxxxxxxxx>
Date: Sun, 4 Mar 2012 09:15:35 +0000
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http://askubuntu.com/questions/109681/which-process-is-using-nvidia-module


I've got bumblebee 3.0 installed, I started chromium-browser with
optirun and although I have closed chromium off, the card is still on.
How can I know which process is using nvidia module that prevents the
card from switching off?

root@magneto:/# cat /proc/acpi/bbswitch
0000:01:00.0 ON
root@magneto:/#
root@magneto:/# tee /proc/acpi/bbswitch <<<OFF
OFF
root@magneto:/# cat /proc/acpi/bbswitch
0000:01:00.0 ON
root@magneto:/# dmesg |tail -1
[92040.608982] bbswitch: device 0000:01:00.0 is in use by driver
'nvidia', refusing OFF
root@magneto:/#