Automatically enables hibernation on Ubuntu 24.04 laptops.

enableHibernationUbuntu.sh

#!/bin/bash

# This script configures suspend mode and prepares for hibernation on Ubuntu 24.04
# It ensures swap space is sufficient and configures GRUB for proper resume settings

# Check if the script is run as root or with sudo
if [ "$(id -u)" -ne 0 ]; then
    echo "This script must be run as root or with sudo."
    exit 1
fi

# Function to check and adjust swap size
adjust_swap() {
    local RAM_SIZE=$(free -m | awk '/^Mem:/{print $2}')
    local SWAP_SIZE=$(free -m | awk '/^Swap:/{print $2}')
    local SWAP_FILE="/swapfile"

    echo "RAM size: ${RAM_SIZE}MB"
    echo "Current swap size: ${SWAP_SIZE}MB"

    if [ "$SWAP_SIZE" -lt "$RAM_SIZE" ]; then
        echo "Current swap space is less than RAM size. Adjusting swap space..."
        # Disable and remove current swap file if it exists
        swapoff -a
        [ -f $SWAP_FILE ] && rm -f $SWAP_FILE

        # Create a new swap file with size equal to RAM size
        fallocate -l ${RAM_SIZE}M $SWAP_FILE
        chmod 600 $SWAP_FILE
        mkswap $SWAP_FILE
        swapon $SWAP_FILE

        # Add swap file entry to /etc/fstab if not already present
        if ! grep -q "$SWAP_FILE" /etc/fstab; then
            echo "$SWAP_FILE none swap sw 0 0" | tee -a /etc/fstab
        fi

        echo "Swap space adjusted to ${RAM_SIZE}MB."
    else
        echo "Current swap space is sufficient."
    fi
}

# Function to configure GRUB for hibernation
configure_grub_for_hibernation() {
    local SWAP_UUID=$(blkid -o value -s UUID $(findmnt -no SOURCE --target /swapfile))
    local RESUME_FILE=$(readlink -f /swapfile)
    local RESUME_OFFSET=$(filefrag -v $RESUME_FILE | awk '/^ *0:/{print $4}' | sed 's/\..*//')

    echo "Configuring GRUB for hibernation with resume UUID $SWAP_UUID and offset $RESUME_OFFSET"

    # Add or update GRUB configuration
    sed -i.bak -r "s|^(GRUB_CMDLINE_LINUX_DEFAULT=).*|\1\"quiet splash resume=UUID=$SWAP_UUID resume_offset=$RESUME_OFFSET\"|" /etc/default/grub

    # Update GRUB
    update-grub

    echo "GRUB configuration updated. Please verify the settings and reboot if necessary."
}

# Update and upgrade the system
apt update && apt upgrade -y

# Install necessary packages (if not already installed)
apt install -y pm-utils

# Enable suspend on lid close (for laptops)
gsettings set org.gnome.settings-daemon.plugins.power lid-close-battery-action 'suspend'
gsettings set org.gnome.settings-daemon.plugins.power lid-close-ac-action 'suspend'

# Set suspend timeouts (adjust as necessary)
# Suspend after 15 minutes on battery
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-battery-type 'suspend'
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-battery-timeout 900

# Suspend after 30 minutes on AC power
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type 'suspend'
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout 1800

# Ensure sufficient swap space
adjust_swap

# Configure GRUB for hibernation
configure_grub_for_hibernation

# Optional: Install and configure TLP for additional power management (for laptops)
apt install -y tlp tlp-rdw
systemctl enable tlp
systemctl start tlp

# Confirm changes
echo "Suspend mode and hibernation configuration are complete. Please verify the settings."

# Optional: Reboot to apply changes
# Uncomment the next line if you want to reboot automatically
# sudo reboot

exit 0