Comment 33 for bug 1220426

It was interesting thing when I tried to switch back to bumblebee from nvidia-prime. I have done these steps:
sudo apt-get purge nvidia-prime
sudo add-apt-repository ppa:bumblebee/stable
sudo apt-get update
sudo apt-get install nvidia-331 nvidia-settings
sudo apt-get install bumblebee bumblebee-nvidia primus primus-libs-ia32

But then I started World of Goo (from Steam) using optirun. And when in game startscreen I've pointed to profiles icon - there has been a freeze again!
I removed bumblebee, primus, nvidia-331.
After that I installed nvidia-319-updates, then bumblebee and primus.
And now i have no freeze at all.

So I think the bug is not in nvidia-prime but in nvidia-331driver, because with nvidia-319-updates there's no freeze.