Add-On script for AntergrosPrime and to be used with Configurable Button https://store.kde.org/p/1297839.

gpu_switch.sh

#! /bin/sh

#:
#: AntergosPrime/Configurable Button GPU Switch Script
#:
#: Small script to automate the process of switching gpu in KDE. This
#: is ment to be used with AntergrosPrime, and a widget called
#: Configurable button.
#:
#: This script has three functions:
#: 1. Activate "prime-select" to switch to either nvida or intel GPUs
#: 2. Logout the user, or restart the laptop to complete the process.
#: 3. Keep track of which GPU is in use for the Configurable Button.
#:
#: Usage: ./gpu_switch.sh [Option]
#:
#: Options:
#:    --help              Show this message and exit.
#:    --intel             Selects intel and complets changes.
#:    --nvidia            Selects nvidia and complets changes.
#:    --status            Checks status of which GPU it's using.
#: 
#: By default, the script will log the user out when changing to intel. It will
#: reboot if changing to nvidia. Change variables in the script if you want a
#: result. Also it's recomended to have the status part of the Configurable buttons
#: to refresh every few seconds incase you cancel it when it ask for your
#: sudo password.
#:
#: License: CC-0/Public-Domain/WTFPL (http://www.wtfpl.net/) license
#:

### User Configuration

## Logout or Shutdown?
# For my case intel is okay by logging out and in. On the other hand
# my Nvidia card breaks my display server so I need to reboot the Laptop.
# Complete change to intel by logging out. If false, the PC will reboot.
logout_intel=true
# Complete change to nvidia by logging out. If false, the PC will reboot.
logout_nvidia=false

# No need to make any changes below unless you know what you are doing.
#######################################################################
## Activate Prime-Select

check=false

select_intel(){
  notify-send "GPU Switch" "WARNING: Close all programs and save before proceeding."
  kdesu --noignorebutton -n prime-select intel
  check=true
  gpu_status
  if [ $status = 1 ] ; then
    notify-send "GPU Switch" "ACTION CANCELED: Staying on Nvidia"
    exit 0
  else
    if [ $logout_intel = true ]; then
      logout=true
    else
      logout=false
    fi
    complete_change
  fi
}

select_nvidia(){
  notify-send "GPU Switch" "WARNING: Close all programs and save files before proceeding."
  kdesu --noignorebutton -n prime-select nvidia
  check=true
  gpu_status
  if [ $status = 0 ]; then
    notify-send "GPU Switch" "ACTION CANCELED: Staying on Intel"
    exit 0
  else
    if [ $logout_nvidia = true ]; then
      logout=true
    else
      logout=false
    fi
    complete_change
  fi
}

## Logout/Shutdown to complet change

complete_change(){    

  notify-send "GPU Swtich" "Completing Changes"
  if [ $logout = true ]; then
    qdbus org.kde.ksmserver /KSMServer logout 0 3 3
  else
    reboot
  fi
}

gpu_status(){
  status=$(type -p nvidia-smi | grep -c nvidia)
  if [ $status = 1 ]; then
    echo "Running Nvidia"
    if [ $check = false ]; then
      exit 1
    fi
  else 
    echo "Running Intel"
    if [ $check = false ]; then
      exit 0
    fi
  fi
}

# Error Message
run_help(){
  grep '^#:' $0 | cut -d ':' -f 2-50
  exit 0
}

## Commandline Processing
case "$1" in
  --help)
    run_help
    ;;
  --intel)
    select_intel
    ;;
  --nvidia)
    select_nvidia
    ;;
  --status)
    gpu_status
    ;;
  *)
    run_help
    ;;
esac