It may know how many pixels I have on my display, but is that enough? If DDC does not specify a size, 75 DPI is used by default.If no DisplaySize is given, the monitor size values from DDC are used to derive the DPI, given the screen resolution.If this is not used, the DisplaySize setting in the X config file is used to derive the DPI, given the screen resolution.The -dpi command line option has highest priority.The DPI of the X server is determined in the following manner: But even after all that, xdpyinfo still returns: dimensions: 1600x900 pixels (423x238 millimeters) After patching the latter, I can enjoy my native 118 DPI. Still, no visual changes as I'm using Gnome, and 96 DPI is also hard-coded in gnome-settings-daemon. However, xdpyinfo | grep -E 'dimensions|resolution' always returns: dimensions: 1600x900 pixels (423x238 millimeters) In /etc/X11//nf and restart, Xorg.0.log correctly reports: (**) intel(0): Display dimensions: (344, 193) mm I know that my screen size is 344x193 mm so obviously xdpyinfo calculates the physical size based on pixel resolution ( 1600x900) and default 96 DPI.
Returns: dimensions: 1600x900 pixels (423x238 millimeters) Running xdpyinfo | grep -E 'dimensions|resolution' Excerpt from my Xorg.0.log on a fresh Archlinux install: (=) intel(0): DPI set to (96, 96) It doesn't calculate anything unless you specify DisplaySize via Xorg config files. As far as I know, starting with version 1.7, xorg defaults to 96 dpi.
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