Comment 21 for bug 151311

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Achim Bohnet (allee) wrote : Re: DPI in kubuntu incorrect on xorg-video-driver-intel

Or try

       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.

In the monitor section of xorg.conf. Should work with kdm and kde session.