how to execute a command after resume from suspend?

Question

I've got a script that is executed in order to have suspending/resuming working in my laptop. Then I have another series of xinput,xkbset and xmodmap commands that are executed when I initiate a session to have two-finger scrolling and keyboard shortcuts set up. When I resume from suspend, two-finger scrolling and my keyboard shortcuts won't work. I need to manually execute the commands in the second file again. How can I add those to the suspend/resume script to have this done automatically? See below:

suspend/resume script

/etc/pm/sleep.d/20_custom-ehci_hcd

#!/bin/sh
#inspired by http://art.ubuntuforums.org/showpost.php?p=9744970&postcount=19
#...and http://thecodecentral.com/2011/01/18/fix-ubuntu-10-10-suspendhibernate-not-working-bug    
# tidied by tqzzaa :)

VERSION=1.1
DEV_LIST=/tmp/usb-dev-list
DRIVERS_DIR=/sys/bus/pci/drivers
DRIVERS="ehci xhci" # ehci_hcd, xhci_hcd
HEX="[[:xdigit:]]"
MAX_BIND_ATTEMPTS=2
BIND_WAIT=0.1

unbindDev() {
  echo -n > $DEV_LIST 2>/dev/null
  for driver in $DRIVERS; do
    DDIR=$DRIVERS_DIR/${driver}_hcd
    for dev in `ls $DDIR 2>/dev/null | egrep "^$HEX+:$HEX+:$HEX"`; do
      echo -n "$dev" > $DDIR/unbind
      echo "$driver $dev" >> $DEV_LIST
    done
  done
}

bindDev() {
  if [ -s $DEV_LIST ]; then
    while read driver dev; do
      DDIR=$DRIVERS_DIR/${driver}_hcd
      while [ $((MAX_BIND_ATTEMPTS)) -gt 0 ]; do
          echo -n "$dev" > $DDIR/bind
          if [ ! -L "$DDIR/$dev" ]; then
            sleep $BIND_WAIT
          else
            break
          fi
          MAX_BIND_ATTEMPTS=$((MAX_BIND_ATTEMPTS-1))
      done  
    done < $DEV_LIST
  fi
  rm $DEV_LIST 2>/dev/null
}

case "$1" in
  hibernate|suspend) unbindDev;;
  resume|thaw)       bindDev;;
esac

touchpad two-finger scrolling and keyboard shortcuts script

xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Two-Finger Scrolling" 8 1
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Scrolling" 8 1 1
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Pressure" 32 10
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Width" 32 8
setxkbmap -layout gb
xkbset m
xkbset exp =m
xmodmap -e "keycode 135 = Pointer_Button2"

Answer 1

You can place your scripts in the /etc/pm/sleep.d directory to have them run after suspend. You will need to add a conditional to make your script run only during resume and not during the suspend process as well. For example, your touchpad script would look like:

case "${1}" in
    resume|thaw)
        DISPLAY=:0.0 ; export DISPLAY
        xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Two-Finger Scrolling" 8 1
        xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Scrolling" 8 1 1
        xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Pressure" 32 10
        xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Width" 32 8
        setxkbmap -layout gb
        xkbset m
        xkbset exp =m
        su $USER -c "sleep 3; /usr/bin/xmodmap -e "keycode 135 = Pointer_Button2"" &
;;
esac

Be sure your script is marked globally executable and change $USER to the corresponding username.

You can find more detailed information in the pm-suspend manpage (man pm-suspend) or by looking at the documentation in /usr/share/doc/pm-utils (particularly /usr/share/doc/pm-utils/HOWTO.hooks.gz).

Answer 2

On Ubuntu 16.04 I had to create service this way:

1. create file

   sudo gedit /etc/systemd/system/somename.service
   

2. put inside

   [Unit]
   Description=Some description
   Before=sleep.target
   StopWhenUnneeded=yes
   
   [Service]
   Type=oneshot
   RemainAfterExit=yes
   ExecStop=-/path/to/your/script.sh
   
   [Install]
   WantedBy=sleep.target
   

3. enable service

   sudo systemctl enable somename
   

4. (optional) if not working after resume from suspend > check for errors with

   journalctl -u somename.service
   

Answer 3

Open this file:

sudo vim /lib/systemd/system-sleep/hdparm

Contents:

#!/bin/sh

case $1 in 
  post)
    /usr/lib/pm-utils/power.d/95hdparm-apm resume
    ## Paste your command to run your script
    ;; esac

Your command will execute with admin privileges.

Answer 4

Here is the version I use to restart my VPN daemon after resume:

#!/bin/sh

case "$1" in
        pre)
                echo "$(date) - $1: Restarting norvpnd" >> /tmp/nordvpn/suspend.txt
                /usr/bin/systemctl restart nordvpnd
                ;;
        post)
                echo "$(date)-  $1: Doing nothing" >> /tmp/nordvpn/suspend.txt
                ;;
esac

This file is put in:

/lib/systemd/system-sleep//00restart_nordvpnd.sh

This works fine in Ubuntu 20.4. The pre part is executed before putting the computer to sleep (suspend) and the post part is executed when it is resumed, as that can be verified by looking at the /tmp/nordvpn/suspend.txt file.

Side note (irrelevant to the subject but worth noting): Regarding the task in this example, it might seem illogical to restart a daemon before putting the computer to sleep, but it's the (only?) way it works.