i have already fixed the problem by adding that code to Xorg.conf
Section "Monitor"
Identifier "Configured Monitor"
HorizSync aa-bb
VertRefresh cc-dd
EndSection
AS.....
HorizSync 30-70
VertRefresh 50-150
....................
thanks for your help
--
[K8M800] Video Card is not functioning properly
https://bugs.launchpad.net/bugs/382397
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which is subscribed to xserver-xorg-video-openchrome in ubuntu.
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