cat /var/log/Xorg.0.log | grep DRI
(II) Loading extension XFree86-DRI
(II) RADEON(0): [dri] Found DRI library version 1.3.0 and kernel module version 1.25.0
(**) RADEON(0): DRI New memory map param
(**) RADEON(0): DRI Finishing init !
(II) RADEON(0): [DRI] installation complete
(WW) RADEON(0): DRI init changed memory map, adjusting ...
(II) GLX: Initialized DRI GL provider for screen 0