display resolution

[Lennart Sorensen]

On Sun, Jul 11, 2010 at 04:46:34PM -0400, D. Hugh Redelmeier wrote:
> 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?

What version is your intel xserver?  There was a bug a couple of years
ago that made the intel driver misread the DDC info and completely mess
up the DPI detection.

What is the full output of /var/log/Xorg.0.log?

-- 
Len Sorensen
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