Can't start X 4.2.1 running garnome 0.24.2

[Mario Vukelic <mario vukelic dantian org>]

I get this error (using Matrox MGA G550). With Gnome 2.2 I don't

drmOpenByBusid: busid is PCI:1:0:0
drmOpenDevice: minor is 0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 6, (OK)
drmOpenByBusid: drmOpenMinor returns 6
drmOpenByBusid: drmGetBusid reports PCI:1:0:0
(II) MGA(0): [drm] drmSetBusid failed (6, PCI:1:0:0), Device or resource
busy
(EE) MGA(0): [drm] DRIScreenInit failed.  Disabling DRI.


I have no idea, thanks for help