I installed Hardy Heron on the D600 using the 8.04.1 Live CD, using the
installer's "safe graphics" mode.  When Hardy started up, xdpyinfo
reported the screen size to be 291x212 mm, which is nearly correct.  The
autogenerated xorg.conf uses the vesa driver.  I added DisplaySize to
xorg.conf, and when X restarted the display size and dpi were correct.
(Original xdpyinfo, xorg log, and xorg.conf attached.)  So I think the
problem is in the driver, not xserver -- at least, vesa does something
right that ati doesn't.

I also deleted xorg.conf.  With no xorg.conf, X detects the video card
and uses the ati driver, with the same results as before: dpi
incorrectly calcuated to be 96x96.

I hope this issue can be fixed for Hardy.

** Attachment added: "Log for autogenerated xorg.conf"
   http://launchpadlibrarian.net/21587312/first-Xorg.0.log

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ati radeon driver does not autodetect displaysize on Latitude D600, therefore 
uses wrong resolution
https://bugs.launchpad.net/bugs/80940
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