It seems that modern X11 servers with modern monitors can retrieve the display information automatically. At least I can't find any reference to the display size or dpi information in the configuration files, but the information provided by xdpyinfo is pretty accurate (only about 0.5 centimeters off).

In reply to Re: Re: Re: Re: Conversion Modules from Pixels to Millimeters by eserte
in thread Conversion Modules from Pixels to Millimeters by Anonymous Monk

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