I have a laptop that I usually connect to an external monitor. I use Ubuntu 16.04 and Gnome 3.18.5. When I do connect to the external monitor, I like to turn the laptop screen off. I can do that by going to System Settings, Screen Display, selecting the built-in display and then clicking "off". I'd like to automate the process. I found a script that claimed to do that at startup. It's as follows:


sleep 15


xrandr |grep $EXTERNAL_OUTPUT | grep " connected "
if [ $? -eq 0 ]; then
    xrandr --output $INTERNAL_OUTPUT --off --output $EXTERNAL_OUTPUT --auto
    xrandr --output $INTERNAL_OUTPUT --auto --output $EXTERNAL_OUTPUT --off

I made the script a startup application.

It works as advertised when the external monitor is connected. However, when the external monitor is not connected, I first see my desktop on the laptop screen as I would like it. Then, when the script wakes up and runs, the bottom panel on my desktop suddenly jumps to the top of the screen and comes to rest immediately below the top panel. I can't find any reports of this happening to anyone else.

If anyone could explain to me why the script is causing this behavior and tell me how to correct it, I'd be very grateful.




Leslie Katz

email: lesliek [at] mymts [dot] net

Please visit http://ssrn.com/author=1164057 to find hyperlinks

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