Matching drm versions

[Dave Airlie]

> 
> ,----glxinfo stderr with LIBGL_DEBUG=verbose----
> | libGL: XF86DRIGetClientDriverName: 5.0.1 radeon (screen 0)
> | libGL: OpenDriver: trying /usr/lib/modules/dri/radeon_dri.so
> | drmOpenByBusid: Searching for BusID pci:0000:01:00.0
> | drmOpenDevice: node name is /dev/dri/card0
> | drmOpenDevice: open result is 4, (OK)
> | drmOpenByBusid: drmOpenMinor returns 4
> | drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0
> | libGL error: Radeon DRI driver expected DDX version 4.0.x but got version 5.0.1
> | libGL warning: 3D driver returned no fbconfigs.
> | libGL error: InitDriver failed
> | libGL error: reverting to (slow) indirect rendering

There is no mention of incorrect DRM version in the above code.. it
says DRI driver and DDX version, so the X code and the Mesa code are
out of sync..

This actually caused by ColorTiling, swich it off in xorg.conf Option
"ColorTiling" "0"

Dave.