Hello
Your VertRefresh as is in xorg.conf limits the vertical frash rate.
Change it for the correct value of your monitor or remove it.
Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 28-51 --> Remove or change this for the correct value
VertRefresh 43-60 --> Remove or change this for the correct value
EndSection
I hope this help
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Only 60 Hz display refresh available from gnome screen resolution utility
https://bugs.launchpad.net/bugs/27508
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