I found that the xrandr features did not work with my NVidia driver in my old laptop.  I had to use the nvidia-settings tool, which worked with shortcomings.  But, my new laptop has an Intel video card.  The xrandr works with it.

Here are the commands that are working for me:

switching to dual monitors

xrandr --output VGA --auto --output LVDS --auto --right-of VGA

What did not work:

  • Leaves a black section on three quarters of the bottom of my laptop LCD panel.
  • only puts the applications menu and application switcher on the external Monitor — I would rather it be on the LCD panel
  • Only displays the monitor at 1024×768 @60hz.  I need it higher than 60hz for the flicker.

switching back to a single monitor

xrandr  --output VGA --off

What did not work:

  • did not move my windows back to the center, may have been because it thought they were on the left screen.

Changes to xorg.conf

I had to add the virtual setting in the Screen section.  Also, I had to add the mode to make the monitor use a 85hz instead of 60hz.

What did not work:

  • I have to start XWindows with the external monitor unplugged.  Otherwise, the laptop uses the 1024×768 setting from the monitor for the laptop screen, which is normally 1440×900.



One Response to “XRandr”

  1. Mike B Says:

    Regarding the position of the toolbars, I found that annoying, too..
    You can use the commands:
    me@sharpie:~$ gconftool -s /apps/panel/toplevels/top_panel_screen0/monitor 1 –type=int
    me@sharpie:~$ gconftool -s /apps/panel/toplevels/top_panel_screen0/monitor 0 –type=int
    to move the panels (applications menu and switcher) between monitors.
    You may have to look in gconf-editor under /apps/panel/toplevels to see the exact names of your Gnome panels – I also have a bottom_panel, too.

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