display resolution

[D. Hugh Redelmeier]

It seems that xorg.config is considered optional and even a bad idea.

Without it, xorg seems to get display resolution (in the sense of dpi 
(dots per inch)) wrong.

For example, my Thinkpad X61 has a screen with 1400x1050 pixels and X 
figures this out from EDID.  It also sees this (which is correct):

[    33.901] (II) intel(0): Max Image Size [cm]: horiz.: 25  vert.: 18

So my screen is 150 DPI.  But X thinks it is 96 DPI.  I can change that by 
saying
	xrandr --dpy 150
or adding a Monitor section to my (so far non-existant) xorg.config:
    Section "Monitor"
	Identifier "Monitor0"
	DisplaySize 250 180   # In millimeters
    EndSection

There is no GUI way in the obvious place on Fedora 13: System:
Preferences: Monitors.

This seems dumb since the information is useful and discoverable.

Am I missing something?
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