View Full Version : [kubuntu] multiple monitors

November 6th, 2009, 05:43 AM
Can somebody explain how to make a multiple-monitor setup (where my screen is spread across several monitors)?

I tried to play with xrandr:

xrandr --output VGA-0 --left-of LVDS
xrandr: screen cannot be larger than 1440x1440 (desired size 2048x768)

Indeed, xrandr -q reports:

Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1440 x 1440
VGA-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0*+ 85.0 75.0 70.1 60.0*
1400x1050 60.0
1280x1024 75.0 60.0
1440x900 59.9
1280x960 60.0
1280x800 59.8
1152x864 75.0 70.0
1280x720 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 66.7 59.9
720x400 70.1
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 304mm x 228mm panning 1024x768+0+0
1024x768 61.3*+
800x600 59.9
640x480 59.4
S-video disconnected (normal left inverted right x axis y axis)

So from the first line it seems that my screen is limited to 1440x1440 max. Why? How can I make it larger?

In KDE's System Settings/Display/Multiple monitors I have an error message:
This module is only for configuring systems with a single desktop spread across multiple monitors. You do not appear to have this configuration.
So how can I have this configuration?

I have libxinerama1 installed. Should it be specifically enabled? Where?
Here somebody is saying that xinerama is deprecated:
Are xrandr and xinerama two exclusive tools, or they complete each other?

Some people suggest that I should edit xorg.conf, adding a 'Virtual' line to the screen section, however, I would like to avoid this (by the way I don't even find the /etx/X11/xorg.conf, X seems to be using an automatic dynamic configuration...).

Total confusion.
Any help is appreciated. Thanks

December 1st, 2009, 04:39 AM
What graphics card are you using?
You should be able to do the whole thing by editing your xorg.conf file
try "sudo gedit /etc/X11/xorg.conf"

January 23rd, 2010, 03:06 PM
Same problem here. Could find no useable workarounds. I have a HP flaptop with intel graphics, a second monitor to my VGA out, registered as VGA1 in the settings. The dual display setup screen reports "You do not appear to have this config". My system does not use NVIDIA, nor is there a /etc/X11/xorg.conf file to edit.

Finally, I typed this:

# xrandr --output LVDS1 --mode 1280x800
# xrandr --output VGA1 --mode 1280x1024
# xrandr --output VGA1 --pos 1280x0

Which works.

Edit: until the next time you login. Perhaps I should add these lines to the boot sequence.