ScreenTest fail on linux

Dear Psychtoolbox experts,


I'm working on linux mint 13 and I've got a dell xps 15 L502X. I've just done the psychotoolbox installation and I wanted to test the hardware configuration with ScreenTest. When I run this function my screen goes black and then goes back to the login screen. It crashes and logs me out.


Do you have any idea with what goes wrong with my setup ?


Thank you in advance for your help.


Arnaud