I followed this thread and created some scripts that work for a fresh install of ubuntu 22.04.
I couldn't figure out how to get awk's match function to work, so I just used code from @meuh and @JinnKo to create a non-awk version that disables/toggles multiple devices given a keyword.
First, make sure evtest is installed:
sudo apt install evtest
I have two files, one that toggles the touchscreen on and off, and one that always disables it when booting up.
Toggle Touchscreen:
#!/bin/bash
# This toggles my touchscreen
#search for "Touchscreen" or something like that in /proc/bus/input/devices to make sure you're disabling what you want to disable.
path_for_temp_files="/ANY_PATH_YOU_WANT_TO_STORE_SOME_PID_FILES/"
regex='event([0-9]+)'
DEVICE="Touchscreen"
if [ -r "${path_for_temp_files}touchscreen-evtest0.pid" ]; then
kill_these_files=("${path_for_temp_files}"touchscreen-evtest*)
for i in "${kill_these_files[@]}"; do
echo "kill" $(cat "${i}")
sudo kill $(cat "${i}")
sudo rm "${i}"
done
else
filename='/proc/bus/input/devices'
inside=0
events=()
while read line; do
if [[ $line =~ $DEVICE ]]; then
inside=1
fi
if [[ $line =~ $regex ]]; then
if [[ "$inside" -eq 1 ]]; then
events+=("${BASH_REMATCH[1]}")
fi
inside=0
fi
done < $filename
numevents=${#events[@]}
for (( i=0; i<${numevents}; i++ )); do
sudo evtest --grab "/dev/input/event${events[$i]}" > /dev/null &
pid=$!
echo $pid > "${path_for_temp_files}touchscreen-evtest${i}.pid"
echo "/dev/input/event${events[$i]} running on pid ${pid}"
done
fi
Disable Touchscreen to run at boot:
#!/bin/bash
# This disables my touchscreen
#search for "Touchscreen" or something like that in /proc/bus/input/devices to make sure you're disabling what you want to disable.
path_for_temp_files="/ANY_PATH_YOU_WANT_TO_STORE_SOME_PID_FILES/"
regex='event([0-9]+)'
DEVICE="Touchscreen"
if [ -r "${path_for_temp_files}touchscreen-evtest0.pid" ]; then
kill_these_files=("${path_for_temp_files}"touchscreen-evtest*)
for i in "${kill_these_files[@]}"; do
echo "kill" $(cat "${i}")
sudo kill $(cat "${i}")
sudo rm "${i}"
done
fi
filename='/proc/bus/input/devices'
inside=0
events=()
while read line; do
if [[ $line =~ $DEVICE ]]; then
inside=1
fi
if [[ $line =~ $regex ]]; then
if [[ "$inside" -eq 1 ]]; then
events+=("${BASH_REMATCH[1]}")
fi
inside=0
fi
done < $filename
numevents=${#events[@]}
for (( i=0; i<${numevents}; i++ )); do
sudo evtest --grab "/dev/input/event${events[$i]}" > /dev/null &
pid=$!
echo $pid > "${path_for_temp_files}touchscreen-evtest${i}.pid"
echo "/dev/input/event${events[$i]} running on pid ${pid}"
done
Then I followed this answer to run as root at startup
