[Bug 348753] [NEW] no GUI way to set screen preferences for GDM

[kevmitch]

Public bug reported:

This is a related problem to #148189. It's kind of hard to pin down
which package this should be submitted under as it is somewhat of a
systemic problem between the xorg intel driver, gdm and the per-user
screen resolution configuration GUI.

For the record, I'm running Jaunty with
xserver-xorg                   7.4~5ubuntu16
xserver-xorg-core           1.6.0-0ubuntu4 
xserver-xorg-video-intel 2:2.6.3-0ubuntu2 
gdm                               2.20.10-0ubuntu1 
gnome-control-center   1:2.26.0-0ubuntu1

This is the way I understand it:
When xorg starts, the intel driver will currently detect available screens and activate all of them as duplicates (all the same resolution). This is probably better behaviour than described in #148189, but it still looks like a train wreck if you have multiple LCDs that require different resolutions. 

I admit it might be difficult to improve the default duplication
behaviour. Currently, if you duplicate the displays with native
resolution (by setting up xorg.con manually), GDM defaults to having the
greeter span the largest monitor and being cut off in the smaller ones.
Alternatively, due to limitations in the Intel graphics chipsets,
defaulting to native resolution xinerama is not an option because this
may require expanding the virtual screen to a size larger than will
allow 3d acceleration. This of course is not to mention the issue of
determining the "correct" xinerama layout.

Fine, imagine I'm a new user who just installed Ubuntu and I know
nothing about editing config files. I am appalled by the default screen
layout when GDM pops up, so when I log in, I find the Display settings
GUI and fix it to what ever settings I want (including making a larger
virtual screen - kudos BTW!). These settings will persist across logins
of that user *and only that user*. Notably, GDM will still has the same
awful defaults. Short of editing xorg.conf there does not appear to be a
way to get GDM to behave sanely.

I might thus make two concluding suggestions:
1) Make the intel driver default to screen duplication *at native resolution*  AND have GDM default to spanning the smallest screen rather than the largest one as it does now.  
2) Allow users to configure the default GDM display settings through the Display settings GUI. I imagine this could be achieved by having GDM call xrandr during startup.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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no GUI way to set screen preferences for GDM
https://bugs.launchpad.net/bugs/348753
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