b[adrien@localhost ~]$ beryl
XGL Absent, checking for NVIDIA
__driCreateNewScreen_20050727 - succeeded
libGL warning: 3D driver claims to not support visual 0x46
Nvidia Absent, assuming AIGLX
__driCreateNewScreen_20050727 - succeeded
libGL warning: 3D driver claims to not support visual 0x46
beryl: Support for non power of two textures missing
beryl: Failed to manage screen: 0
beryl: No manageable screens found on display :0.0