Aver Driver "radeonhd"
Résultat :

$ tail /var/log/Xorg.0.log
        RS690 : Radeon X1200, X1250, X1270.

(II) RADEONHD: version 1.2.1, built from non-git sources

(II) Primary Device is: PCI 02:00:0
(--) Assigning device section with no busID to primary device
(EE) No devices detected.

Fatal server error:
no screens found

Ok, je regade le log pour ton ./75