I'm running Fedora on a Dell 2400 with a Daytek DT-95P monitor. After some messing around, I managed to get different resolutions working, but I can't seem to change the refresh rate. Preferences > Screen Resolution and xrandr both report 85hz but my monitor (and my eyes) say 60hz. I even tried adding Modeline's generated with videogen to my XF86Config but it didn't help. My monitor specs are setup properly (I think).