It's not a bug - it's a FEATURE! See more:
https://bugs.freedesktop.org/show_bug.cgi?id=23705

Since xorg 1.7 it lies about Your screens DPI (unless You use NVIDIA
closed drivers). Because Microsoft Windows up to Vista defaulted to
96dpi, now also X servers default to 96dpi no mater what screen size You
have. Lucky for You, You can't override this "feature" in Your xorg.conf
file.

Only option - get correct screen size settings in mm and add "xrandr --fbmm 
WxH" to Your .xsessionrc or set DisplaySize at  Section "Monitor" in Your 
xorg.conf.
Be ware, that xdpyinfo also lies about Your screen size! If You use nouveau 
driver, it reports correct screen size and DPI in xorg.log and then this 
information gets ignored. Check Your screen dimensions with plain' ol' ruler to 
find out correct screen size. 

Don't forget to inform Xorg dev's how You *love* this new feature!

Correct settings for Dell Latitude E6500 with 1440*900 screen are: 
  dimensions:    1440x900 pixels (333x212 millimeters)
  resolution:    110x108 dots per inch


** Bug watch added: freedesktop.org Bugzilla #23705
   http://bugs.freedesktop.org/show_bug.cgi?id=23705

-- 
DPI not set or incorrectly set to 96
https://bugs.launchpad.net/bugs/201032
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