Comment #22 : Bug #201032 : Bugs : linux package : Ubuntu
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/201032/comments/22/+index
> 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.
だる
23705 – xserver forces 96 DPI on randr-1.2-capable drivers, overriding correct autodetection
https://bugs.freedesktop.org/show_bug.cgi?id=23705