I recently bought a new laptop and it comes with the NVidia Optimus technology, which means that you get an energy efficient graphics card for normal use (Intel HD4000) and a dedicated NVidia card for graphic intensive use (GT650M in my case). Obviously, I would like to use the NVidia card with PA. In Linux one can use Bumblebee to switch between the two cards. Prepending any command with "optirun" will result in the NVidia card being used. For example Code: glxspheres Will run glxspheres on the HD4000 and give me 60 fps. On the other hand Code: optirun glxspheres will give me roughly 160 fps. I've purchased nearly all of the Humble Bundle games and it works great with all of the games I've tried so far. However, when I try to run PA using optirun, I get this error: Code: X Error of failed request: GLXUnsupportedPrivateRequest Major opcode of failed request: 153 (GLX) Minor opcode of failed request: 16 (X_GLXVendorPrivate) Serial number of failed request: 37 Current serial number in output stream: 37 This is using the NVidia version 313 drivers that come with Kubuntu 13.04. I've reported it as a bug on the bug tracker, but I'm wondering if this could be solved by manually installing the latest NVidia drivers (319.32). It's usually quite a hassle to get them working (although I haven't done it in a while), so I was wondering if you think that might help. P.S. PA works fine with the HD4000 card for now.