I have been using Kubuntu for a while and now I am back to Ubuntu . after a few days I realized my eyes hurt much and I wondered why .
by looking at the :
/etc/X11/xorg.conf
I found out that Ubuntu has not identified my monitor and it uses a generic plug and play driver.
and therefore the "Refresh Rate" of the monitor is lowered to 50 Hz . my monitor can produce 70 Hz in 1024*768 resolution .
in Kubuntu you can choose your monitory in system setting but in ubuntu it is a hidden setting .
to choose your monitor model and set the "refresh rate" in ubuntu this in terminal : (you need to restart after that)
gksu displayconfig-gtk
mind that each monitor can produce different refresh rate for different screen resolution, for your eye comfort I recommend you to choose a screen resolution which has at least 70 Hz refresh rate . for my monitor it is available in 1024*768 , and now my eyes doesn't ache anymore.
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