guillaume@guillaume /mnt/divers/guillaume> cat /var/log/Xorg.0.log | grep WW
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(WW) The core pointer device wasn't specified explicitly in the layout.
(WW) RADEON: No matching Device section for instance (BusID PCI:1:0:1) found
(WW) RADEON(0): Direct Rendering Disabled -- Dual-head configuration is not working with DRI at present.
(WW) RADEON(0): Failed to detect secondary monitor, MergedFB/Clone mode disabled
(WW) RADEON(1): Direct Rendering Disabled -- Dual-head configuration is not working with DRI at present.
(WW) RADEON(0): Direct rendering disabled
(WW) RADEON(1): Direct rendering disabled
(WW) <default pointer>: No Device specified, looking for one...
En fait il n'y a pas de solution...