Bug#564645: fails to obtain EDID for 1 monitor in dual monitor setup

Steve M. Robbins steve at sumost.ca
Sat Jan 23 06:55:59 PST 2010

On Mon, Jan 11, 2010 at 08:04:15AM +0100, Brice Goglin wrote:
> Steve M. Robbins wrote:
> > Package: xserver-xorg-video-radeon
> > Version: 1:6.12.4-2
> > Severity: normal
> >
> > Just upgraded all packages today and rebooted into my first attempt at
> > using xserver 1.7 and friends.
> >
> > I have an ancient Sony G400 CRT and a Syncmaster LCD attached to my card.
> > I used to be able to run them in 1600x1200 and 1280x1024, respectively.
> >
> > Now, when X starts, the Syncmaster (DVI-1) is detected, but the Sony
> > (DVI-0) is not.  Note also that "get-edid | parse-edid" fails to
> > obtain data from the Sony:

I first worked around the problem by downgrading back to
the previous version of xserver.  It turns out that "get-edid"
does not produce anything useful from the Sony G400 in that instance,
either.  Yet, xserver managed to figure out the monitor modes 
correctly.  Was there some code in the xserver for older monitors
that has gone missing?

> You should be able to work around the problem with Option Modeline and
> PreferredMode in xorg.conf,
> or xrandr --newmode and --addmode.

Today I upgraded again, and yes, that works.  Thanks very much.

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