by How can I manually tune the monitor refresh rates in X-Windows. I want to
use the same rates as in Windows to avoid getting a picture that doesn't fit
the screen. I have to reduce the vertical refresh rate from 100Hz to 85Hz.
As far as I know, this is done in the XF86Config. Each resolution has it's
own modeline, like this:
Modeline "1024x768" 85 1024 1032 1152 1360 768 784 787 823
The numbers are not the exact rates measured in Hz. Is there a way to
calculate or measure these numbers, for example with a utility?