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Re: display-mm-width return value off on Windows

From: Ralf Angeli
Subject: Re: display-mm-width return value off on Windows
Date: Sun, 09 Jul 2006 09:36:07 +0200

* Jason Rumney (2006-07-09) writes:

> You're right, DDC is supported for analog monitors also. So I wonder
> why 320mm was reported as the width for all 3 of my monitors. It is
> about right for the 15.1" and 14.1" widescreen, but the 19" should be
> closer to 400mm.

I guess we won't find out on a non-free system where we cannot look at
the code.

> In case anyone wants to investigate why the numbers are off (is
> Windows using what the monitor reports?), there's a program to read
> the data from the monitor independantly of the OS/video drivers here:
> http://john.fremlin.de/programs/linux/read-edid/
> It fails on my laptop with the 15.1" display when run from Windows XP,
> however.

I didn't install read-edid, but xdpyinfo run on GNU/Linux reports
wrong values for my notebook: 474x356mm  That's why I normally set the
correct value in xorg.conf with the DisplaySize directive.


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