Hi mfaridi,
have you build a custom xorg.conf file? If not, try it out and configure the refresh rates of your monitor. For example, in my case (Asus M6Ne Laptop) it looks like this:
Quote:
Section "Monitor"
Identifier "mymonitor"
Option "DPMS"
HorizSync 30-70
VertRefresh 50-160
EndSection
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It's from the xorg.conf under Debian but it should look similar under OpenBSD.
All you have to know are the values for "HorizSync" and "VertRefresh". You should find these values in the manual of your monitor.