Xorg.log and xdpyinfo report different real screen size (in mm)
Submitted by Matthias Saou
Assigned to Xorg Project Team
This is a bug report copied over from here : https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=179434
I've got FC development on an x86_64, with an ATI Radeon 9200SE card, connected to a 37" LCD TV through DVI.
In my Xorg.log file, I can see : (--) RADEON(0): Display dimensions: (820, 460) mm (--) RADEON(0): DPI set to (31, 42)
Which is the correct real size (yes, it's big!). But in X, xdpyinfo reports : screen #0: print screen: no dimensions: 1024x768 pixels (839x464 millimeters) resolution: 31x42 dots per inch
The reported size differs slightly, and the calculated aspect ratio too. This doesn't make much sense to me, since people forcing the screen size in xorg.conf would probably expect to get the same values from xdpyinfo. Or is there an explanation for this difference in values?