unable to unclone external screen with gnome-display-properties

[bersyl91]

Binary package hint: gnome-control-center

=== Abstract ===

In xrandr, VGA and LVDS are renamed to VGA1 and LVDS1, so gnome-display-properties doesnt function anymore

May be related to bug #353186

=== Details ===
When I plug my external screen into external the VGA socket, it's well recognized and immediately clones my laptop's screen.
But It's a 50" and my laptop only has a 9.8" one. So I want to have a very much more better resolution on my external screen.

When I launch gnome-display-properties, everything seems ok. I see both screens. But whatever action I take in the application, it has exactly no effect. If I uncheck the "clone screens" checkbox, everything stays identical. If I try to change the resolution of my external screen, nothing happens.

I've thought it was a side effect of Compiz, so I uninstalled it. Effectively, it solved the problem... until the next reboot.

I investigated further and found this page (in french) http://www.matthieuamiguet.ch/actus/karmic_xrandr where Matthieu explains that his screens have been renamed in xrandr.

I tried his manipulations and it worked.

Currently, I have to launch
xrandr --output LVDS1 --auto --output VGA1 --auto --left-of LVDS1
to have the resolution I want

--- xrandr output ---
xrandr
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 4096 x 4096
VGA1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 700mm x 390mm
   1920x1080 59.9*+
   1360x768 59.9
   1280x768 60.0
   1024x768 60.0
   800x600 60.3
   640x480 60.0 59.9
   720x400 70.1
LVDS1 connected 1024x600+1920+0 (normal left inverted right x axis y axis) 195mm x 113mm
   1024x600 60.0*+
   800x600 85.1 72.2 75.0 60.3 56.2
   640x480 85.0 72.8 75.0 59.9
   720x400 85.0
   640x400 85.1
   640x350 85.1

--- system details ---
lsb_release -rd
Description: Ubuntu lucid (development branch)
Release: 10.04

apt-cache policy gnome-control-center
gnome-control-center:
  Installé : 1:2.30.0-0ubuntu3
  Candidat : 1:2.30.0-0ubuntu3
 Table de version :
 *** 1:2.30.0-0ubuntu3 0
        500 http://fr.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: firefox 3.6.3+nobinonly-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic i686
Architecture: i386
Date: Fri Apr 9 10:24:08 2010
EcryptfsInUse: Yes
FirefoxPackages:
 firefox 3.6.3+nobinonly-0ubuntu1
 firefox-gnome-support 3.6.3+nobinonly-0ubuntu1
 firefox-branding 3.6.3+nobinonly-0ubuntu1
 abroswer N/A
 abrowser-branding N/A
InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
ProcEnviron:
 PATH=(custom, user)
 LANG=fr_FR.utf8
 SHELL=/bin/bash
SourcePackage: firefox

[Sebastien Bacher (seb128)]

the configuration dialog doesn't rely on the VGA naming, I doubt your issue is due to that, did you try to uncheck the mirror box in the configuration tools?

[bersyl91 (choppy-free)]

Yes, of course. This action didn't have any effect. The pink rectangle on the top left stayed the same, as did any other action on this tool.

[bersyl91 (choppy-free)]

Having tweaked her and there, I've made some test calling directly randr on the command line and it did do the stuff.

[Pedro Villavicencio (pedro)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. A new version of GNOME Control Center is available on Maverick and we are wondering if this bug is still an issue for you with that version? Could you please test and comment back? Thanks in advance.

[Launchpad Janitor (janitor)]

[Expired for gnome-control-center (Ubuntu) because there has been no activity for 60 days.]