display: Low refresh rate (problems with radeon driver?)

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http://forums.fedoraforum.org – [google translate - reverso.net] Hi, I can not change the refresh rate? (I use Fedora 11) Graphics card: ATI x800xl Driver: radeon Display: ADI Microscan E75 I can only select 60Hz or 75Hz but not 85Hz. The problem is the radeon driver? I have tried the following command: Code: xrandr --rate 85 but it doesn't work. How can I resolve this problem? (HowTos)