New answers tagged x-server
As far as I know, starting with version 1.7, xorg defaults to 96 dpi. It doesn't calculate anything unless you specify DisplaySize via Xorg config files. Also, don't rely on xdpyinfo output. My laptop runs on Intel SandyBridge. Excerpt from my Xorg.0.log on a fresh Archlinux install: (==) intel(0): DPI set to (96, 96) running xdpyinfo | grep -E ...
The DPI of the X server is determined in the following manner: The -dpi command line option has highest priority. If this is not used, the DisplaySize setting in the X config file is used to derive the DPI, given the screen resolution. If no DisplaySize is given, the monitor size values from DDC are used to derive the DPI, given the screen resolution. If ...
Dots Per Inch = Dots ( pixels ) / Inches ( physical size of monitor ).
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