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Old 03-09-09, 04:25 PM   #1
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Join Date: Sep 2008
Location: Baltimore MD
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Default How to run multihead without desktop on screens 2 and 3?

I am developing a program that needs two screens in a three screen
multihead (two nvidia 8400 BPUs) system for writing graphics. I use
Xlib and gdm to write to the screens and want the root windows to
otherwise have a uniform background which I set. Currently the root windows have
desktop adornments: a menu bar at the top and a task bar at the bottom,
but they show my chosen background and my graphics as intended. I am
looking for suggestions on how I can prevent the adornments from being
displayed. I assume they are being added by a desktop manager, though
it is not apparent to me where it is informed to handle screens 2 and 3.
I do want a desktop on the console screen.

I am running Ubuntu 8.04 with the metacity window manager and a Gnome
desktop. I get the same treatment of screens 2 and 3 if I boot with gdm
or I come up on a terminal and execute startx. My graphics hardware is
a pair of Nvidia 8400 GPUs, console and second monitor attached to one
and the third monitor on the second gpu.

I'd be glad to provide more information on my system if desired
(nvidia-bug-report, sure, though I don't have a malfunction). I show
below a relevant segment of the output from ps ax.

Many thanks for any help.

5942 tty1 S+ 0:00 /bin/bash /usr/bin/startx
5959 tty1 S+ 0:00 xinit /etc/X11/xinit/xinitrc -- /etc/X11/xinit/xserverrc -auth /tmp/serverauth.DeUITr5949
5960 tty7 SLs+ 3:51 /usr/bin/X11/X -nolisten tcp
5969 tty1 S 0:00 /usr/bin/ck-launch-session /usr/bin/seahorse-agent --execute x-session-manager
5999 ? Ss 0:00 /usr/bin/ssh-agent /usr/bin/ck-launch-session /usr/bin/seahorse-agent --execute x-session-manager
6002 tty1 Sl 0:03 x-session-manager
6050 ? Ss 0:00 /usr/bin/seahorse-agent --execute x-session-manager
6069 tty1 SL 0:00 /usr/bin/gnome-keyring-daemon
6078 ? Ss 0:00 dbus-daemon --fork --print-address 19 --print-pid 21 --session
6081 tty1 Sl 0:02 gnome-settings-daemon
6089 tty1 Sl 0:12 /usr/bin/pulseaudio --log-target=syslog
6092 tty1 S 0:00 /usr/lib/pulseaudio/pulse/gconf-helper
6101 tty1 S 0:26 /usr/bin/metacity --sm-client-id=default0
6104 tty1 S 0:28 gnome-panel --sm-client-id default1
6107 tty1 Sl 0:06 nautilus --no-default-window --sm-client-id default2
6117 ? Ss 0:34 gnome-screensaver
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