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:/# tee /proc/acpi/bbswitch <<<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

I've noticed that Flash sometimes turns the card automatically on and then loads the driver. If the module is not used you can safely unload it after which you manually disable the card:

sudo rmmod nvidia
sudo tee /proc/acpi/bbswitch <<<OFF

If the driver cannot be unloaded, it will display:

ERROR: Module nvidia is in use

There is not much that you can do about that. A CUDA application of Xorg server is possible using it. You can check it with:

lsof -n -w -t /dev/nvidia*

It'll return a PID list unless you remove -t.

  • I killed the process, rmmod'ed the nvidia modules and did a 'tee' again and it's now off. Thanks! – 719016 Mar 4 '12 at 12:46

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.