hola googleando encontre algo, ojala te sirva.
creo que el problema es del xorg.conf...
Section "Device"
Identifier "ATI Technologies, Inc. RV370 5B60 [Radeon X300 (PCIE)]"
Driver "fglrx"
Option "AddARGBGLXVisu
als" "True"
Option "RenderAccel" "True"
Option "AllowGLXWithCo
mposite" "True"
Option "backingstore" "True"
Option "TripleBuffer" "True"
Option "DisableGLXRoot
Clipping" "true"
Option "VideoOverlay" "on"
Option "OpenGLOverlay" "off"
BusID "PCI:1:0:0"
Option "UseFBDev" "true"
Option "EnablePageFlip"
Option "ColorTiling"
#Option "DamageEvents" "true"
# fin
# Driver "fglrx"
# Option "VideoOverlay" "on"
# Option "OpenGLOverlay" "off"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "ATI Technologies, Inc. RV370 5B60 [Radeon X300 (PCIE)]"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1152x864" "1024x768" "800x600" "720x400" "640x480" "0x0"
EndSubSection
SubSection "Display"
Depth 4
Modes "1152x864" "1024x768" "800x600" "720x400" "640x480" "0x0"
EndSubSection
SubSection "Display"
Depth 8
Modes "1152x864" "1024x768" "800x600" "720x400" "640x480" "0x0"
EndSubSection
SubSection "Display"
Depth 15
Modes "1152x864" "1024x768" "800x600" "720x400" "640x480" "0x0"
EndSubSection
SubSection "Display"
Depth 16
Modes "1152x864" "1024x768" "800x600" "720x400" "640x480" "0x0"
EndSubSection
SubSection "Display"
Depth 24
Modes "1152x864" "1024x768" "800x600" "720x400" "640x480" "0x0"
EndSubSection
EndSection
Section "DRI"
Mode 0666
EndSection
Section "Extensions"
Option "Composite" "0"
EndSection
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