Thank you for your report. I sense there may be more than issue here.
First question, are you connecting over VGA or HDMI?
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
** Changed in: xorg (Ubuntu)
Assignee: (unassigned) => Rolf Leggewie (r0lf)
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https://bugs.launchpad.net/bugs/1047156
Title:
EDID does not allow LCD widescreen configuration
Status in “xorg” package in Ubuntu:
Incomplete
Bug description:
Ubuntu has new strict EDID guidelines that does not allow LCD
widescreen configuration.
Symptoms:
Constant flickering on and off of screen content, including distortion
similar to a bad tv reception.
The screen is a LCD Citizen C19604HD that should run 1440x 900 at 60
Hz (as per manual), which apparently does not have proper EDID. I
should note this setup had no problems prior, until tty1 started to
complain about a bad EDID checksum during 12.10 beta.
Fix:
Attempting to set my own xorg.conf evoked a message about running in low
graphics mode. It asked if I wanted to (re)configure. I confirmed, after which
I no longer needed xorg,conf, nor presumably Option "IgnoreEDID"
"on" in xorg.conf which made xorg sessions usable.
What should happen
The system should be self-healing. The user should not have to grapple with
xorg.conf (for hours or days on end with unfamiliar concepts [EDID] and
work-arounds), and even less after all that time and effort just to have the
system say, "Hey, I don't like what you're doing. Here, let me do it.". This
(self-repair) hook should be invoked sooner in the trouble shooting process.
See related problem about
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1047146
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