Section "Device"
Identifier "ATI Technologies, Inc. Radeon 9550"
Driver "ati"
Option "AGPMode" "8" #usually not needed, the driver will use the setting from BIOS
Option "AccelMethod" "XAA" #either XAA or EXA. "XAA" is the default and safe choice
Option "ColorTiling" "on"
Option "EnablePageFlip" "true" #only works with accelmethod "XAA"
Option "AccelDFS" "true" #seemed to speed things up using EXA acceleration
Option "TripleBuffer" "true" #This *might* help if you use something like Beryl and have slow video playback.
Option "DynamicClocks" "on" #This is for laptop users, it saves energy when in battery mode.
Option "DMAForXv" "true" #This can speed up movie playback but can in rare cases case instability
Option "GARTSize" "64" #This is the size of the "GART" that xorg will use.
BusID "PCI:1:0:0" #must match your lspci output
EndSection
Section "Monitor"
Identifier "Syncmaster 795df/795mb/cd195gp"
Option "DPMS"
HorizSync 30-85
VertRefresh 50-160
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Radeon 9550"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1024x768_85" "800x600_85" "640x480_85"
EndSubSection
EndSection
Section "ServerLayout"
Option "AIGLX" "true"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection
Section "DRI"
Mode 0666
EndSection
Section "Extensions"
Option "Composite" "Enable"
EndSection
Это мой xorg, а все познания вот отсюда
https://help.ubuntu.com/community/RadeonDriver, двое суток кофе пил