I have a Dell D600 running Gutsy, upgraded from Feisty.
xorg version is currently 1:7.2-5ubuntu13.
xserver-xorg-video-ati version is currently 1:6.7.196-1ubuntu2.
My xorg.conf contains
...
Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
DisplaySize 285 215
EndSection
...
/var/logs/Xorg.0.log contains
...
(II) RADEON(0): Output LVDS using initial mode 1400x1050
after xf86InitialConfiguration
(**) RADEON(0): Display dimensions: (285, 215) mm
(**) RADEON(0): DPI set to (124, 141)
...
Note that the Y component of DPI is calculated incorrectly!
xdpyinfo says
...
dimensions: 1400x1050 pixels (370x277 millimeters)
resolution: 96x96 dots per inch
...
So the specified dimensions, and the calculated DPI values, are not taking
effect.
--
ati radeon driver does not autodetect displaysize on Latitude D600, therefore
uses wrong resolution
https://bugs.launchpad.net/bugs/80940
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