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I'm running Ubuntu 12.04 64bit on the Ivy Bridge Sony Vaio S. I installed bumblebee for nvidia-optimus support. Everything seemed to install fine, but if I use a command like: optirun firefox my computer just shuts down. No proper shutdown sequence or anything, just boom. down.

Any help would be very much appreciated.

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See the Bumblebee trouble shooting guide:

If you still have problems, you will need to file a bug report:

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