Home Theatre PC - Setting DPI in Xorg

A second post on the same day, has hell frozen over? No, actually I put the wrong date on yesterday’s post. Oops.

The DPI problem was fixed very easily by following the instructions on the link I provided in my previous post, I calculated that my Sony Bravia KDL 32S3000 had dimensions of 700mm x 390mm and a native resolution of 1366x768.

$ xdpyinfo | grep dimensions
$ xdpyinfo | grep "dots per inch"

Converting the millimetres to inches and dividing the resolution by the inches dimensions gave me DPI of 50x50, surprisingly low. I believe this is because the KDL 32S3000 is not a full HD TV but only 1080i. Setting this in /etc/X11/xorg.conf cured the problem with the KDM login manager.

Section "Monitor"
    Identifier "Monitor0"
    Option   "DPI" "50 x 50"
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