[Openchrome-users] DPI changed after upgrade to xorg-7.2

[Luc Verhaegen]

On Sun, May 06, 2007 at 10:34:23PM +0200, Benno Schulenberg wrote:
> 
> Upgrading from Xorg-7.1.1 to 7.2.0 had the unexpected result of 
> changing the line spacing in several places on the desktop.
> Diffing the logs from before and after the upgrade shows this:
> 
> -(**) VIA(0): Display dimensions: (320, 240) mm
> -(**) VIA(0): DPI set to (81, 81)
> +(**) VIA(0): Display dimensions: (310, 230) mm
> +(**) VIA(0): DPI set to (83, 84)
> 
> Xorg seems to be confused here: the diplay domensions (310, 230) 
> do not come from the config file, as the stars (**) seem to say, 
> but were probed from the EDID block.
> 
> http://webcvs.freedesktop.org/xorg/xserver/xorg/hw/xfree86/common/xf86Helper.c
> Looking at this file, it seems that pScrn->monitor->widthmm 
> and pScrn->monitor->heightmm somehow get set to ddcWidthmm 
> and ddcHeightmm, instead of to what the DisplaySize option in 
> xorg.conf specifies.
> 
> Anyone an idea why this is going wrong now?
> 
> Benno
> 

Yes, EDID handling code currently ignores these configged values and 
uses the EDID provided ones. A mail with a patch was sent to the xorg 
list just a few days ago.

Luc Verhaegen.
http://unichrome.sf.net/