It's a monitor thing. Monitors advertise their capabilities through EDID.
Within reason, you can specify the refresh rate ranges that your monitor is capable of yourself, by putting the VertRefresh and HorizSync ranges in your xorg.conf. You should be able to get these numbers from the manual or specifications for your monitor. These values go in the "Monitor" Section of xorg.conf.
You can edit xorg.conf with
Code:
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
gksudo gedit /etc/X11/xorg.conf
Code:
Section "Monitor"
Identifier "Configured Monitor"
HorizSync aa-bb
VertRefresh cc-dd
EndSection
You'll need to replace aa-dd with the values for
your monitor.
According to
this page, the values for your monitor are
Code:
HorizSync 30-69
VertRefresh 50-120
You may also need to tell X to ignore whatever the monitor is telling it. You can do this by putting
Code:
Option "UseEDID" "False"
in the Device section.
As far as I can tell, your monitor can only do 75Hz at 1024×768, not at 1280×1024.
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