sudo gedit /etc/X11/xorg.conf
Section "Device"
Identifier "Configured Video Device"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
Horizsync 30-81
Vertrefresh 56-75
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
SubSection "Display"
Modes "1280x1024" "1024x768" "1152x864"
EndSubSection
EndSection
Section "Device"
Identifier "Configured Video Device"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
Horizsync 30-81
Vertrefresh 56-75
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
SubSection "Display"
Modes "1280x1024" "1024x768" "1152x864"
EndSubSection
EndSection