I am trying to set refresh rate to 85 Hz or 75 Hz at 1024x768 and 1280x1024. On Windows this works, so my card and monitor have 100% support. xrandr does not work - it gives me configure crtc 1 failed I use FGLRX. Please help Monitor:CRT - HP 92 (manual http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/lpv09818/lpv09818.pdf) G. card: AMD Radeon HD 6450 Sorry for bad english, I am Czech.