I know this bug report has been closed but I'd still like to leave a
record for myself and for any other having the same problems.
@Rolf
You might have been right about there being more than one issue at play here.
Since reporting this, I've had to stop using lightdm because of it sending me
into low graphics mode ("message about running in low graphics mode" in
original report).
I found out that lightdm's greeter is defined in
/etc/lightdm/lightdm.conf and as of recent:
greeter-session=unity-greeter
I investigated further and realized that there is also a lightdm-gtk-greeter.
I installed it and changed the above file to reflect:
greeter-session=lightdm-gtk-greeter
Result
No more being thrown into low graphics mode. And lightdm seems less buggy than
GDM.
I still use ~/.xprofile as defined in my previous comment. I'm not sure
if it's still helping out at the moment, but it's still there, as a fall
back if things break, usually during major upgrades.
No xorg.conf is being used.
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https://bugs.launchpad.net/bugs/1047156
Title:
EDID does not allow LCD widescreen configuration
Status in “xorg” package in Ubuntu:
Invalid
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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