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[sly <poubelle@xxxxxxxxxxx>]

I didn't know such a thing existed.

So I tried to add (blindly) radeon.modeset=0 to my kernel boot options,
and strange things happens ;-)

- I had a bug during the boot process screen resolution that is now corrected
- My X display is corrupted, resolution is good but a green flavour color is added all over the screen
- GL is disabled, 

Diff between Xorg logs about KMS shows :
with radeon.modeset=0 :  
(II) [KMS] drm report modesetting isn't supported.
[drm] failed to load kernel module "radeon"
(EE) RADEON(0): [dri] RADEONDRIGetVersion failed to open the DRM
[dri] Disabling DRI.

without :
(II) [KMS] Kernel modesetting enabled.
(II) RADEON(0): KMS Color Tiling: disabled

-- 
[RV100] very poor Xorg performance on various older graphics HW - XAA no longer works
https://bugs.launchpad.net/bugs/363238
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