Bug#597383: gdm3: gdm greeter appears on wrong monitor while using TwinView
Alexandre Kouznetsov
alk at ondore.com
Sun Sep 19 08:04:47 UTC 2010
Package: gdm3
Version: 2.30.2-4
Severity: normal
Tags: squeeze
I have two monitors, using TwinView, configured with help of "nvidia-settings".
My primary monitor is on the left side, and the secondary is on the right side
(as the default).
When GDM starts, the greeter appears on the secondary (right) monitor, while
it's expected to be on the primary (left). Once logged in, the primary monitor
selection behaves fine, all the menus and panels stays on the primary monitor
as expected. A also have found reports of the same problem on ATI cards.
Apparently it has to do with the mouse position when X starts and the way the
greeter chooses the montor on which to show up. As I see it, the greeter is
supposed to appear on the monitor where the mouse cursor is, which happen to be
placed exactly in the middle of two monitors. The option "XineramaScreen" in
/etc/gdm3/custom.conf (as
http://library.gnome.org/users/gdm/stable/configuration.html.en suggests) does
not seem to correct the problem (they removed Xinerama support from GDM3?).
I do not have a solution, but found some workarounds:
1. While X starts, move the mouse to the left. The delay between X starts and
the greeters is showed seemes to give enought time for the cursor to move to
the correct direction. So when the greeter shows, it is placed on the right
(actually, on the left one, sorry) monitor. Can't say it's usable on a regular
basis, but I believe this workaround illustrates well the nature of the
problem.
2. nvidia-settings utility can create a good xorg.conf example. Between other
things, it allows you to specify the respective position of the screens quite
precisely. In my case (two 1280x1024 flat screens), the line is:
Option "MetaModes" "DFP-0: nvidia-auto-select +0+0, DFP-1: nvidia-auto-select
+1280+0"
The workaround is to make the screens to overlap at least one pixel:
Option "MetaModes" "DFP-0: nvidia-auto-select +0+0, DFP-1: nvidia-auto-select
+1279+0"
This brakes the thin balance of the cursor position to the right side (actually
to the left, sorry again) and the GDM greeter behaves correctly.
3. There is a bug report of the same problem in Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/395314
Joerg Friede suggestes another workaround which i have not tested, but i see no
reason why it shouldn't work. Let me quote:
> Another quick workaround (if not already posted somewhere else) that worked
for me:
>
> - install xwit from using apt-install or synaptics
> - add the following line to /etc/gdm/Init/Default or another script that gets
called by gdm prior to login
>
> xwit -root -warp 500 500 #or use any other x/y coordinates that lie within
the range of the primary monitor
>
> Hope this helps
Thank you.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=es_MX.utf8, LC_CTYPE=es_MX.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages gdm3 depends on:
ii adduser 3.112 add and remove users and groups
ii debconf [debconf-2.0] 1.5.35 Debian configuration management sy
ii gconf2 2.28.1-3 GNOME configuration database syste
ii gnome-session [x-sessio 2.30.2-1 The GNOME Session Manager - GNOME
ii gnome-session-bin 2.30.2-1 The GNOME Session Manager - Minima
ii gnome-terminal [x-termi 2.30.2-1 The GNOME terminal emulator applic
ii libart-2.0-2 2.3.21-1 Library of functions for 2D graphi
ii libatk1.0-0 1.30.0-1 The ATK accessibility toolkit
ii libattr1 1:2.4.44-2 Extended attribute shared library
ii libaudit0 1.7.13-1+b2 Dynamic library for security audit
ii libbonobo2-0 2.24.3-1 Bonobo CORBA interfaces library
ii libbonoboui2-0 2.24.3-1 The Bonobo UI library
ii libc6 2.11.2-5 Embedded GNU C Library: Shared lib
ii libcairo2 1.8.10-5 The Cairo 2D vector graphics libra
ii libcanberra-gtk0 0.24-1 Gtk+ helper for playing widget eve
ii libcanberra0 0.24-1 a simple abstract interface for pl
ii libdbus-1-3 1.2.24-3 simple interprocess messaging syst
ii libdbus-glib-1-2 0.88-2 simple interprocess messaging syst
ii libdevkit-power-gobject 1:0.9.5-1+b1 abstraction for power management -
ii libfontconfig1 2.8.0-2.1 generic font configuration library
ii libfreetype6 2.4.2-1 FreeType 2 font engine, shared lib
ii libgconf2-4 2.28.1-3 GNOME configuration database syste
ii libglib2.0-0 2.24.1-1 The GLib library of C routines
ii libgnome2-0 2.30.0-1 The GNOME library - runtime files
ii libgnomecanvas2-0 2.30.1-1 A powerful object-oriented display
ii libgtk2.0-0 2.20.1-1+b1 The GTK+ graphical user interface
ii liborbit2 1:2.14.18-0.1 libraries for ORBit2 - a CORBA ORB
ii libpam-modules 1.1.1-6 Pluggable Authentication Modules f
ii libpam-runtime 1.1.1-6 Runtime support for the PAM librar
ii libpam0g 1.1.1-6 Pluggable Authentication Modules l
ii libpanel-applet2-0 2.30.2-1 library for GNOME Panel applets
ii libpango1.0-0 1.28.1-1 Layout and rendering of internatio
ii libpolkit-gobject-1-0 0.96-2 PolicyKit Authorization API
ii libpolkit-gtk-1-0 0.96-2 PolicyKit GTK+ API
ii libpopt0 1.16-1 lib for parsing cmdline parameters
ii librsvg2-common 2.26.3-1 SAX-based renderer library for SVG
ii libselinux1 2.0.96-1 SELinux runtime shared libraries
ii libwrap0 7.6.q-19 Wietse Venema's TCP wrappers libra
ii libx11-6 2:1.3.3-3 X11 client-side library
ii libxau6 1:1.0.6-1 X11 authorisation library
ii libxdmcp6 1:1.0.3-2 X11 Display Manager Control Protoc
ii libxklavier16 5.0-2 X Keyboard Extension high-level AP
ii libxml2 2.7.7.dfsg-4 GNOME XML library
ii lsb-base 3.2-23.1 Linux Standard Base 3.2 init scrip
ii metacity [x-window-mana 1:2.30.1-2 lightweight GTK+ window manager
ii policykit-1-gnome 0.96-2 GNOME authentication agent for Pol
ii twm [x-window-manager] 1:1.0.4-2 Tab window manager
ii upower 0.9.5-1+b1 abstraction for power management
ii xterm [x-terminal-emula 261-1 X terminal emulator
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime
Versions of packages gdm3 recommends:
ii at-spi 1.30.1-2 Assistive Technology Service Provi
ii gnome-icon-theme 2.30.3-1 GNOME Desktop icon theme
ii gnome-power-manager 2.30.1-1 power management tool for the GNOM
ii gnome-settings-daemon 2.30.2-1 daemon handling the GNOME session
ii xserver-xephyr 2:1.7.7-6 nested X server
ii xserver-xorg 1:7.5+6 the X.Org X server
ii zenity 2.30.0-1 Display graphical dialog boxes fro
Versions of packages gdm3 suggests:
ii gnome-mag 1:0.16.1-2 a screen magnifier for the GNOME d
ii gnome-orca 2.30.2-1 Scriptable screen reader
ii gok 2.30.0-1 GNOME Onscreen Keyboard
ii libpam-gnome-keyring 2.30.3-1 PAM module to unlock the GNOME key
ii metacity 1:2.30.1-2 lightweight GTK+ window manager
-- debconf information:
* shared/default-x-display-manager: gdm3
gdm3/daemon_name: /usr/sbin/gdm3
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