5) xdpyinfo reports this (notice particularly the size in millimeters):
screen #0:
dimensions: 1920x1200 pixels (508x317 millimeters)
resolution: 96x96 dots per inch
while Xorg.0.log includes this:
[...]
(II) RADEON(0): clock: 154.0 MHz Image Size: 593 x 371 mm
[...]
This is what I have in xorg.conf for the monitor:
Section "Monitor"
Identifier "HH281HPB"
VendorName "Hanns.G"
ModelName "HH281HPB"
HorizSync 24-80
VertRefresh 56-75
DisplaySize 593 371
Option "DPMS"
EndSection
Apparently 'xdpyinfo' has a mind of its own! ;)
Culprit is something in 'radeon':
# grep 'Image Size:' /var/log/Xorg.0.log | uniq
(II) RADEON(0): clock: 154.0 MHz Image Size: 593 x 371 mm
# grep 'screen physical' /var/log/Xorg.0.log
(II) RADEON(0): Setting screen physical size to 508 x 317
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