Skip to content

Instantly share code, notes, and snippets.

@hpsaturn
Last active May 5, 2023 21:32
  • Star 3 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save hpsaturn/7b6d15f149eb5bb9bdb19b94b1b34c42 to your computer and use it in GitHub Desktop.
Virtual Screen handler for expand your desktop to old laptops or Tablets. More info: https://hpsaturn.com/old-laptop-like-second-monitor/
#!/bin/bash
# Secondary display resolution
W=1920 # Virtual display width
H=1080 # Virtual display height
# Primary display config
P="HDMI-A-0" #is the main screen, it can be calle eDP-1 or eDP1 depending on the driver
O="DisplayPort-0" #can be a virtual (recommended if possible) or real output accepted by the xog driver.
#more info: https://wiki.archlinux.org/title/Extreme_Multihead#VNC
############# END SETUP ##############################################################
PW=`xrandr --current | egrep '\*' | awk '{print $1;}' | cut -d x -f 1 | head -n 1`
# Create the virtual display
gtf $W $H 120 | sed '3q;d' | sed 's/Modeline//g' | xargs xrandr --newmode
gtf $W $H 120 | sed '3q;d' | sed 's/Modeline//g' | awk '{print $1;}' | sed 's/^.\(.*\).$/\1/' | xargs xrandr --addmode $O
gtf $W $H 120 | sed '3q;d' | sed 's/Modeline//g' | awk '{print $1;}' | sed 's/^.\(.*\).$/\1/' | xargs xrandr --output $O --right-of $P --mode
sleep 1
# Android device init
# Forward the VNC port to your device and start a VNC session
# adb reverse tcp:5900 tcp:5900 # uncomment for Android secondary display
echo "Starting VNC server"
x11vnc -display :0 -clip ${W}x${H}+${PW}+0 -repeat -forever -nonap -multiptr -noxfixes
# When cancel this script, turn off the virtual display
xrandr --output ${O} --off
# On the old laptop please run:
# vncviewer -shared -ViewOnly -Fullscreen <host ip>
@hpsaturn
Copy link
Author

It's a variant of the Android Display Script script from @8bitbuddhist

This script is workaround to NVIDIA issue with "virtual setup" on X Org for old laptops (the original script was for Android). And also fix some issues in the detection of primary device resolution.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment