For those values, it is usually best to see what the manufacturer lists - check manual or website. I don't specify those values in the xorg.conf of my laptops and they work fine.
You can try this command to get some good screen info though:
Code:
xdpyinfo
On my box (Fedora) it is in the xorg-x11-utils package.
Also, you can try to let X determine your best settings. Try these steps:
1. (re-)boot into non-Graphical runlevel (init 3)
2. log in as root
3. run
Code:
X -configure
4. test it with
Code:
X -config /root/xorg.conf.new
(or whatever the generated xorg conf file is called)
5. press Ctrl+Alt+Backspace to get out of the X test window
and see if that works for you.
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