Keyboard shortcut to switch monitors?

[pan4b]

I have a laptop running Lubuntu 23.04 connected by HDMI to a TV. I can use Preferences > LXQT Settings > Monitor Settings to switch between the laptop screen and the TV but so far I can’t find a keyboard shortcut that works.

(Super + P does nothing. Same with F4 and F5 on external keyboard, and Fn+F4 and Fn+F5 on laptop keyboard.)

I’ve looked in the manual and online but without luck so far.

[Gavinccc]

hi there, with both connected and making sure it switches manually first to make sure it’s working, copy and paste this lot into a terminal, press enter then let me know if it switches for you, repeat to see if it switches back too:

#Toggles between two screens. Assuming only one external screen is connected

monitors=`xrandr | grep -P ' connected' | grep -o '^[^ ]*'`
set -- "$monitors"
#monArr contains an array of the id's of the connected screens
declare -a monArr=($*)

#onMon holds the id of the *first* on screen found
onMon=`xrandr --listmonitors | head -2 | grep -oP "[a-zA-Z]*-[0-9]$"`

#offMon holds the id of the other monitor, which is not on
if [ "$onMon" = "${monArr[0]}" ]

then
    offMon=${monArr[1]}
else
    offMon=${monArr[0]}
fi

#Switches the on screen off and vice versa
xrandr --output $offMon --auto --output $onMon --off

[pan4b]

@Gavinccc

making sure it switches manually first to make sure it’s working

Thanks for the suggestion But before I try these commands maybe I should mention a problem I have re “switching manually” (if that means using the Monitor Settings app), in case it’s relevant.

When I have Lubuntu outputting to just one screen (either laptop or TV) and I try to use Monitor Settings > Fast options to switch to the other screen, it doesn’t do anything. I first have to change to one of the two-screen options (either Unified or Extended) and only then can I change to just one screen.

E.g. it’s just on the TV (Only second) and I want to change to the laptop screen (Only first). Selecting Only First does nothing, even if I click Apply after. So I click on Unified, get the image on both screens, and then I click on Only first and it changes to just the laptop screen.

[Gavinccc]

thats a bit odd, never tried it but i’ll give it a go when i get time. Back to the original question, keyboard shortcut to switch 2 displays. Well, nothing easy really, there’s quite a few posts around asking the same over the years for lxqt, and it appears a bash script would be needed, then a shortcut assigned for a keyboard combination referencing the script (and if it was me, i’d assign a gesture as well just for the sake of it!)., the bit i posted was a bash script content from a lubuntu thread on a Ubuntu forum.