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I've two LG Flatron IPS236 displays @ 1920x1080x60hz, and an ATI Radeon HD 6870, which is using the 'recommended' x.org drivers.

On Windows (yeah..) I used to be able to force the refresh rate to 75hz, but I've had no luck on Ubuntu. This is a deal-breaker for me, except for the fact that I'm a developer, so I can't really rely on Windows. But I need my eyes, my eyes are important.

» xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
DisplayPort-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 290mm
   1920x1080      60.0*+   50.0     59.9  
   1920x1080i     60.1     50.0     60.0  
   1680x1050      59.9  
   1280x1024      60.0  
   1280x960       60.0  
   1152x864       60.0  
   1280x720       60.0     50.0     59.9  
   1024x768       60.0  
   800x600        60.3  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        60.0     59.9  
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 510mm x 290mm
   1920x1080      60.0*+
   1680x1050      59.9  
   1280x1024      60.0  
   1280x960       60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0  
DVI-1 disconnected (normal left inverted right x axis y axis)
  1920x180_85.00 (0x314)   39.0MHz
        h: width  1920 start 1976 end 2160 total 2400 skew    0 clock   16.2KHz
        v: height  180 start  183 end  193 total  196           clock   82.9Hz

I've tried using CompizConfig Settings Manager but changing the refresh rate in there doesn't seem to apply any changes at all.

How do I force the refresh rate past 60hz, to at least 75hz?

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