> Section "Device" > Identifier "Videocard0" > Driver "vesa" > VendorName "Videocard vendor" > BoardName "VESA driver (generic)" > EndSection > > Section "Screen" > Identifier "Screen0" > Device "Videocard0" > Monitor "Monitor0" > DefaultDepth 24 > SubSection "Display" > Viewport 0 0 > Depth 16 > Modes "1280x800" 800x600" "640x480" > EndSubSection > SubSection "Display" > Viewport 0 0 > Depth 24 > Modes "1280x800" > EndSubSection > EndSection It seems you have bad adapter configured (VESA) instead of real thing... so your defaul driver may not know about the mode you are using. Do you have Intel integrated graphics? If so try the following: Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "LCD Panel 1280x800" HorizSync 31.5 - 90.0 VertRefresh 60.0 - 60.0 ModeLine "1280x800_60.00" 83.5 1280 1344 1480 1680 800 801 804 828 -hsync +vsync Option "DPMS" EndSection Section "Device" Identifier "Videocard0" Driver "i810" VendorName "Videocard vendor" BoardName "Intel 855" EndSection Section "Screen" Identifier "Screen0" Device "Videocard0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 Modes "1280x800" "1024x768" "800x600" "640x480" EndSubSection EndSection Or change driver to appropriate value for your card. If still no luck check the errors in /var/log/Xorg.0.log Cheers, GS