Problem starting drm with mach64 (debian, version mismatch)

My system is running kernel 2.6.18.3 with debian unstable. I installed
the mach64 drm module from the git sources (compiled locally) and it loads fine
with the message:

[drm] Initialized drm 1.1.0 20060810 PCI: Unable to reserve mem region #1:1000000@e9000000 for device 0000:01:00.0
[drm] Initialized mach64 2.0.0 20060718 on minor 0: 
[drm] Used old pci detect: framebuffer loaded

I then start X and I get that direct rendering is disabled. Looking in dmesg
the only message is:

[drm:mach64_dma_init] *ERROR* mach64_dma_init called without lock held, held  0 owner 00000000 cf64f900
[drm:drm_unlock] *ERROR* Process 5352 using kernel context 0

and in Xorg.0.log:

(II) ATI(0): [drm] DRM interface version 1.3
(II) ATI(0): [drm] created "mach64" driver at busid "pci:0000:01:00.0"
(II) ATI(0): [drm] added 8192 byte SAREA at 0xd0d55000
(II) ATI(0): [drm] mapped SAREA 0xd0d55000 to 0xb729a000 
(II) ATI(0): [drm] framebuffer handle = 0xe9000000
(II) ATI(0): [drm] added 1 reserved context for kernel
(EE) ATI(0): [dri] ATIDRIScreenInit failed because of a version mismatch.
[dri] mach64.o kernel module version is 2.0.0, but version 1.0 or greater is needed.
[dri] Disabling DRI.    

Any way to solve this or is the xorg version in debian unstable too old?

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