> This may be too low, 1152x768 @ 60 Hz is 52 kHz here. absolutely right! this works: Section "Monitor" Identifier "Tibook panel" HorizSync 30-100 VertRefresh 55-160 Option "DPMS" Modeline "1152x768" 78.741 1152 1173 1269 1440 768 769 772 800 +HSync +VSync EndSection now its all fine. thanks for your help matthew