DisplaySize width height This optional entry gives the width and height, in millimetres, of the picture area of the monitor. If given this is used to calculate the horizontal and vertical pitch (DPI) of the screen. Section "Monitor" Identifier "My Monitor" HorizSync 31.5 - 48.5 VertRefresh 50-70 Option "dpms" DisplaySize 351 229 EndSection xdpyinfo reports: dimensions: 1024x768 pixels (351x229 millimeters) resolution: 74x85 dots per inch Gimp and firefox pick-up the incorrect dpi (gimp reports system resolution 74x85).
I was wrong, it's calculating dpy correctly.
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