I have the same problem.  Here is my xdpyinfo output AFTER setting
xrandr --dpi 125

screen #0:
  dimensions:    1280x900 pixels (260x182 millimeters)
  resolution:    125x126 dots per inch
  depths (7):    24, 1, 4, 8, 15, 16, 32
  root window id:    0x54
  depth of root window:    24 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x20
  default number of colormap cells:    256
  preallocated pixels:    black 0, white 16777215
  options:    backing-store NO, save-unders NO

it's REALLY screwed up, and Kaffeine refuses to play video except for a
sliver, since the original resolution calls for something like 32000 DPI
vertically multiplied by 80 horizontally or something.

To be perfectly clear: for some reason DDC EDID retrievals retrieve the
RIGHT Display Size from the monitor, yet X seems to munge it somehow.
If I specify a manual DisplaySize, the log shows that X picks the manual
size up, nonetheless the DPI gets absurdly distorted (121x188 or
something, when it should be more like 121x122).

Please help!

-- 
DPI is set incorrectly by new driver, even when DisplaySize is set in xorg.conf
https://bugs.launchpad.net/bugs/141146
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