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[Kevin Atkinson <kevin.ubuntu@xxxxxxxxxxxxxxxx>]

I not sure a bug report was ever filed on this specific issue, but here
is the reference to the git commit which fixes this bug:

http://cgit.freedesktop.org/xorg/app/xrandr/commit/?id=27f86db064a5ea60b942fd3d3ddeb462d980df9b

It's easy to reproduce, for example:

  xrandr --newmode "640x480_75.00"   30.75  640 664 728 816  480 483 487 504 -hsync +vsync"
  xrandr

The output will be:
   ...
    640x480_75.00 (0x115)   30.0MHz
          h: width   640 start  664 end  728 total  816 skew    0 clock   36.8KHz
          v: height  480 start  483 end  487 total  504           clock   72.9Hz

Notice how the pixel clock freq. was truncated to 30.00 and the refresh
rate is 72.9 instead of 75.0 like it should be.

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https://bugs.launchpad.net/bugs/835817

Title:
  xrandr client truncates pixel clock freq.

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