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Because it is a vanity and a luxury problem (dual monotor setup and slight differences in the monitors), besides your hardware configuration and setup is your problem don't cry to the X windowing system developers if you have chosen a bad monitor that doesn't go well with the other. I am using Xfce as my desktop environment and the X Windowing System provided by Xorg at this time, and I have no problem, none what so ever, and I can not detect any real problem anyone else...