Changing display with xfconf-query

[Boris Hollas]

Ok, I can switch between internal and external screen with

~$ xfconf-query -c displays -p /Default/DVI-0/Active -t bool -s 'true'
~$ xfconf-query -c displays -p /Default/LVDS/Active -t bool -s 'false'
~$ xfconf-query --create -c displays -p /Schemes/Apply -t string -s 
'Default'
~$
~$ xfconf-query -c displays -p /Default/DVI-0/Active -t bool -s 'false'
~$ xfconf-query -c displays -p /Default/LVDS/Active -t bool -s 'true'
~$ xfconf-query --create -c displays -p /Schemes/Apply -t string -s 
'Default'

However, after the last command, my panel was lost. Also, when I used 
xfce-display-settings -m to switch back to DVI-0, both screens were 
blank. I blindly typed "disp", which runs

#!/bin/sh
LVDS=LVDS
VGA=VGA-0
DVI=DVI-0

xrandr | grep -q "$DVI connected" && DVI_ON=1 || DVI_ON=0
xrandr | grep -q "$VGA connected" && VGA_ON=1 || VGA_ON=0

if [ $DVI_ON -eq 1 ]; then
     xrandr --output $LVDS --off --output $DVI --mode 1920x1200
elif [ $VGA_ON -eq 1 ]; then
     xrandr --output $VGA --auto --output $LVDS --mode 1024x768 
--same-as $VGA
else
    xrandr --output $LVDS --mode 1680x1050
fi


but to no avail. I got my screen back after I switched to the console 
and back to X11. No I have my panel and my screen back.

While I can use xfce-display-settings -m to dock, undock and connect a 
beamer, I need a fail-safe solution to bring my internal LCD back in 
case I forgot to call xfce-display-settings -m before undocking (in 
whcih case my internal LCD is blank and therefore I can't click any 
menus). Unfortunately, my disp script doesn't always work and sometimes 
the panel isn't visible (see my mail from 20.11.)


Best regards,
Boris