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Thread: [HOWTO] Automatically disable touchpad when external mouse connected

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  1. #1
    Join Date
    Mar 2007
    TN, US

    [HOWTO] Automatically disable touchpad when external mouse connected

    If you're like me, you hate using your touchpad when you could be using an external mouse. If you're like me you also have a habit of disabling your touchpad when using a mouse, and forgetting to re-enable it until after you unplug your mouse. If you're like me, this tutorial is exactly what you need.

    What you need to get started:
    You will need to make sure that you have xinput and halevt installed. You almost certainly already have xinput, but the following command will make sure you have what you need:
    sudo apt-get install xinput halevt
    I also recommend that you create a folder for scripts (if you haven't already), and add it to your $PATH. I created a "bin" folder in my home directory for this. Create the folder with:
    mkdir ~/bin
    and add it to your path by issuing the following commands:
    echo "PATH=\$PATH:~/bin" >> ~/.bashrc
    echo "export PATH" >> ~/.bashrc
    Configure the script:
    First we need to create and configure the script which will actually toggle the touchpad:
    cd ~/bin
    touch toggleTouchpad
    gedit toggleTouchpad
    The script should now be open in gedit (feel free to replace gedit with your favorite text editor). Paste the following into the script:
    # toggleTouchpad by Brendon Dugan
    # Toggles a touchpad on or off depending on it's current state or CLI argument
    # To configure, run the command 'xinput list' in terminal and identify your touch pad.
    # Using the output of the above command, change the touchpadString variable to a substring
    # of your touchpad's description that is unique to that device.
    # To run, simply type 'toggleTouchpad' to toggle your touchpad on or off, or
    # 'toggleTouchpad on' to explicitly turn your touchpad on, or
    # 'toggleTouchpad off' to explicitly turn it off.
    # Enjoy!
    # A function for logging
    safemk () {
    if [ ! -d $1 ]; 
      then mkdir $1; 
      chmod +rw $1; 
    touchpadID=$(xinput list | grep $touchpadString | awk -F " " '{print $6}' | awk -F "=" '{print $2}')
    touchpadEnabled=$(xinput list-props $touchpadID | grep "Device Enabled" | awk -F ":" '{print $2}')
    # Create the logging directory
    safemk $logdir
    touch $logdir/errorLog.txt
    # Check for arguments on the command line
    if test $# -eq 1
    	# Change the argument to lowercase
    	arg1=$(echo $1 | tr [:upper:] [:lower:])
    	# There is no argument.
    if [ $cliArg -eq 1 ]
    	# If there's an argument, check to see whether it is on, off, or junk
    	if [ $arg1 = 'on' ]
    		# The argument was 'on', so turn the touchpad on
    		xinput --set-prop $touchpadID "Device Enabled" 1
    		if [ $(xinput list-props $touchpadID | grep "Device Enabled" | awk -F ":" '{print $2}') -eq 0 ]
    			echo "Something went wrong\n" >> $logdir/errorLog.txt
    	elif [ $arg1 = 'off' ]
    		# Sleep for a short time to fix a bug that re-enabled the touchpad immediately after disabling it
    		sleep $sleeptime
    		# The argument was 'off', so turn the touchpad off 
    		xinput --set-prop $touchpadID "Device Enabled" 0
    		if [ $(xinput list-props $touchpadID | grep "Device Enabled" | awk -F ":" '{print $2}') -eq 1 ]
    			echo "Something went wrong, perhaps \$sleeptime needs to be greater than $sleeptime ?\n" >> $logdir/errorLog.txt
    		# The argument was junk, so log the error and go on 
    		echo "Invalid argument \""$arg1"\" was supplied\n" >> $logdir/errorLog.txt
    	# There was no argument, so just toggle the touchpad to the opposite
    	# of the state it has now.
    	if [ $touchpadEnabled -eq 1 ]
    		xinput --set-prop $touchpadID "Device Enabled" 0
    		xinput --set-prop $touchpadID "Device Enabled" 1
    Now make the script executable by running:
     chmod +x ~/bin/toggleTouchpad
    Ok, we're almost configured. We need to make sure that your touchpad will be affected by the script. Run the following command to get a list of all current input devices:
    xinput -list
    It should have an output something like this:
    brendon@brendon-lappy-linux:~$ xinput -list
    ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
    ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
    ⎜   ↳ Logitech Logitech BT Mini-Receiver      	id=15	[slave  pointer  (2)]
    ⎜   ↳ SynPS/2 Synaptics TouchPad              	id=12	[slave  pointer  (2)]
    ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
        ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
        ↳ Power Button                            	id=6	[slave  keyboard (3)]
        ↳ Video Bus                               	id=7	[slave  keyboard (3)]
        ↳ Power Button                            	id=8	[slave  keyboard (3)]
        ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
        ↳ Laptop_Integrated_Webcam_2M             	id=10	[slave  keyboard (3)]
        ↳ AT Translated Set 2 keyboard            	id=11	[slave  keyboard (3)]
        ↳ Dell WMI hotkeys                        	id=13	[slave  keyboard (3)]
        ↳ Logitech Logitech BT Mini-Receiver      	id=14	[slave  keyboard (3)]
    If your touchpad has the word "TouchPad" (case sensitive) in it, the script is ready to go. If it doesn't, edit the variable "touchpadString" in the script to match your touchpad... but remember everything is case sensitive. For now, your script is configured. Next step is testing.

    Test the script:
    Make sure your touchpad is working, and then open a new terminal window. We are going to do four tests. Before and after each test, try your touchpad.

    Test 1:
    Did your touchpad stop working? Good!

    Test 2:
    Did your touchpad start working again? Good!

    Test 3:
    toggleTouchpad off
    Wait at least one second...
    Did your touchpad stop working? Good!

    Test 4:
    toggleTouchpad on
    Wait at least one second...
    Did your touchpad start working again? Good!

    Making the magic happen automatically:
    We're almost there! Now we need to set the script to run automatically when your mouse is plugged in. Making sure your mouse is unplugged, run the following command:
    halevt -i >>~/connectedDevices.txt
    While the command is running, plug in your mouse, and then unplug it. Now press Ctrl +c to kill the process. Open ~/connectedDevices.txt, and you should see something that looks like:
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_b02_noserial
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_b02_noserial_if0
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023_if0
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023_if0_logicaldev_input
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_c70a_00076142E023
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_c70a_00076142E023_if0
    New Device: /org/freedesktop/Hal/devices/usb_device_46d_c70a_00076142E023_if0_logicaldev_input
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023_if0_logicaldev_input
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023_if0
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_c70a_00076142E023_if0_logicaldev_input
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_b02_noserial_if0
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_c70a_00076142E023_if0
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_c70a_00076142E023
    Device removed: /org/freedesktop/Hal/devices/usb_device_46d_b02_noserial
    All of those devices are your mouse. Since each of those events will trigger every time you plug in your mouse, we only need to handle one of them. Pick one that ends in seemingly random numbers, and copy and paste everything after the ":" into a text file. We will be using it in a moment. Now, let's create our halevt config file:
    touch ~/.halevt.xml && gedit ~/.halevt.xml
    Paste the following into the file:
    <?xml version="1.0" encoding="UTF-8"?>
    <halevt:Configuration version="0.1" xmlns:halevt="">
    	<halevt:Device match=" = /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023">
    		<halevt:Insertion exec="toggleTouchpad off"/>
    		<halevt:Removal exec="toggleTouchpad on"/>
    We are almost done! Remember the bit I had you paste into another file?? We are going to use that to identify your device. In the config file, change the line that says:
    <halevt:Device match=" = /org/freedesktop/Hal/devices/usb_device_46d_c70e_00076142E023">
    to say :
    <halevt:Device match=" = /org/freedesktop/Hal/devices/the_rest_of_what_you_copied_into_the_file">
    Theoretically, we're done!

    Test the Magic:
    From terminal run:
    sudo killall halevt
    halevt -c ~/.halevt.xml
    Now, connect your mouse. If all is going well, about ~1.5 seconds after you plug in your mouse your touchpad should stop working. Now, disconnect your mouse. Your touchpad should start working again.

    Making it permanent:
    If all went well in the tests, you will want to make this happen automatically forever. Go to "System->Preferences->Startup Applications", and add a new startup program. Name it something you will remember, and for the command put "halevt -c ~/.halevt.xml". You're done!!

    Didn't work? Undo it!:
    Undoing this configuration is fairly straightforward. Start out by going to "System->Preferences->Startup Applications" and removing the entry we added in the step above. Now let's remove halevt and the files we created:
    sudo apt-get remove halevt
    rm ~/.halevt.xml ~/bin/toggleTouchpad
    Optionally you can also remove the ~/bin folder (it's still a good idea to have in my opinion) and the configuration for it:
    rmdir ~/bin
    gedit ~/.bashrc
    and remove the lines
    export PATH
    from the end. You should be set back to your normal state!

    Special Thanks:
    While writing this script I received a great deal of help from the user Arndt, so you should go leave him lots of love and thanks.
    Last edited by brennydoogles; November 26th, 2010 at 09:52 PM. Reason: Changed all aptitude references to apt-get, added a section for reverting changes, changed rm ~/bin to rmdir ~/bin.
    Registered Linux user 446122 , Registered Machine 352936.

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