Hello guys, I can't enable the 2D acceleration (3D is fine), with radeon and radeonhd.

I have an ATI 3850 in a Debian Testing. The key I think is the next, from the X log:

(II) RADEONHD(0): [dri] Visual configs initialized
(II) RADEONHD(0): [DRI] installation complete
(EE) RADEONHD(0): [dri] CP_INIT failed
(EE) RADEONHD(0): RHDDRIFinishScreenInit: RHDDRIKernelInit Failed.
(WW) RADEONHD(0): RHDCSInit: CS for R600 requires DRI.
(II) AIGLX: Screen 0 is not DRI2 capable
(II) AIGLX: Screen 0 is not DRI capable

Do you have any clue of what is happening?

Thanks in advance.