johndoe@jd-ubuntu:~$ cairo-dock
warning :  (/build/buildd/cairo-dock-3.0.2/src/gldit/cairo-dock-opengl.c:cairo_dock_initialize_opengl_backend:209)
  couldn't find an appropriate visual, trying to get one without Stencil buffer
(it may cause some little deterioration in the rendering) ...

 ============================================================================
	Cairo-Dock version : 3.0.2
	Compiled date      : Jun 15 2012 18:51:46
	Built with GTK     : 2.20
	Running with OpenGL: 1
 ============================================================================

drmRadeonCmdBuffer: -22. Kernel failed to parse or rejected command stream. See dmesg for more info.

Build drm, mesa, xf86-video-ati. then

johndoe@jd-ubuntu:~$ LD_LIBRARY_PATH=/usr/local/lib LIBGL_DRIVERS_PATH=/usr/local/lib/dri cairo-dock
warning :  (/build/buildd/cairo-dock-3.0.2/src/gldit/cairo-dock-opengl.c:cairo_dock_initialize_opengl_backend:209)
  couldn't find an appropriate visual, trying to get one without Stencil buffer
(it may cause some little deterioration in the rendering) ...

 ============================================================================
	Cairo-Dock version : 3.0.2
	Compiled date      : Jun 15 2012 18:51:46
	Built with GTK     : 2.20
	Running with OpenGL: 1
 ============================================================================

it work