A script to turn off the touchscreen on your Steam Deck while using Mod Organizer 2 so it doesn't crash to desktop

no-touch.sh

# version 1.0
# This is intended to turn off the Steam Deck's touchscreen in desktop mode when you launch Mod Organizer 2 as installed
# by modorganizer2-linux-installer (haven't tested on a SteamTinkerLaunch install). In desktop mode only, any input from the
# touchscreen causes my MO2 to crash. And I haven't tested this under a SteamTinkerLaunch install yet.

# 1. save this to /home/deck/bin/no-touch.sh (and run `chmod u+x` on it)
# 2. update sudoers (use `sudo visudo`) to let the script turn the touchscreen off. Add the line:
#        deck ALL=(ALL) NOPASSWD: /usr/bin/libinput list-devices, /usr/bin/tee /sys/class/input/*/device/inhibited
#    This allows programs on your computer to read extra hardware info and write to certain admin files named "inhibited"
# 3. update your Steam launch options to:
#        ~/bin/no-touch.sh ; %command% ; ~/bin/no-touch.sh reset
#    If you would put something else in launch options, it goes between the semicolons

TOUCH_DEVICE='FTS3528'
[ "$1" = "reset" ] && RESET=true
[ -z "$KDE_FULL_SESSION" ] && GAMING=true
# in desktop mode, turn the touchscreen off when starting, on when done
# in gaming mode, force the touchscreen on when starting, in case of prior failure
if [ -z "$GAMING" ]; then
  [ -z "$RESET" ] && TOUCHOFF=true
  [ -n "$RESET" ] && TOUCHON=true
else
  [ -z "$RESET" ] && TOUCHON=true
fi

if [ -n "$TOUCHON" ] || [ -n "$TOUCHOFF" ]; then
  # Finds the matching entry in libinput list-devies with the touch capability
  # to select just the one touchscreen, replace the awk part of the pipeline with this:
  #	| awk 'BEGIN{RS="";FS="\n"} /^Device:\s+'$TOUCH_DEVICE_NAME'/ && /\nCapabilities:.*\stouch(\s|$)/' \
  TOUCH_EVENT="$( sudo libinput list-devices \
    | awk 'BEGIN{RS="";FS="\n"} /^Device:\s+'$TOUCH_DEVICE'/ && /\nCapabilities:.*\stouch(\s|$)/' \
    | sed -En 's/Kernel:\s*(.*)/\1/p' )"
  [ -n "$TOUCH_EVENT" ] && INHIBIT_FLAG="/sys/class/input/$(basename $TOUCH_EVENT)/device/inhibited"
  [ -n "$INHIBIT_FLAG" ] && ( [ -n "$TOUCHON" ]; echo $? | sudo tee $INHIBIT_FLAG >/dev/null)
fi

This would be convenient as an mo2 python plugin so it doesn't need any changes to Steam launch options, but Proton has a hardened wine environment and I'd need a bridge mechanism to run the linux commands from within mo2.

Looks like SteamTinkerLaunch could be used trigger the script if you don't want to add more to your launch options.