enmyj/suspend-then-hibernate-cachy.md

## suspend-then-hibernate-cachy.md

      
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              suspend-then-hibernate-cachy.md
            
          
    Suspend-Then-Hibernate Setup for Framework Laptop (CachyOS)

This guide configures suspend-then-hibernate on CachyOS with btrfs, GRUB, and zram. The system will suspend to RAM when you close the lid, then automatically hibernate to disk after 2 hours.
System specs: 32GB RAM, btrfs filesystem, GRUB bootloader, existing zram

Step 1: Create Swap File

Create a 38GB swap file for hibernation (RAM + sqrt(RAM)):
# Create swap directory if it doesn't exist
sudo mkdir -p /swap

# Create swap file on btrfs
sudo btrfs filesystem mkswapfile --size 38G /swap/swapfile

# If the above command doesn't work (older btrfs-progs), use this method:
sudo truncate -s 0 /swap/swapfile
sudo chattr +C /swap/swapfile
sudo fallocate -l 38G /swap/swapfile
sudo chmod 600 /swap/swapfile
sudo mkswap /swap/swapfile
Step 2: Enable Swap File

# Enable the swap file
sudo swapon /swap/swapfile

# Add to fstab for automatic mounting at boot
echo '/swap/swapfile none swap defaults 0 0' | sudo tee -a /etc/fstab

# Verify swap is active
swapon --show
Step 3: Get Resume Parameters

You need two values for GRUB configuration:
# Get the UUID of your root partition
sudo findmnt -no UUID -T /swap/swapfile

# Get the physical offset of the swap file
sudo btrfs inspect-internal map-swapfile -r /swap/swapfile
Write down both values - you'll need them in the next step.
Step 4: Configure GRUB

# Edit GRUB configuration
sudo vim /etc/default/grub
Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT and add the resume parameters (replace with your actual UUID and offset):
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=your-uuid-here resume_offset=your-offset-here"

Example:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=12345678-1234-1234-1234-123456789abc resume_offset=123456"

Regenerate GRUB configuration:
sudo grub-mkconfig -o /boot/grub/grub.cfg
Step 5: Configure initramfs

# Edit mkinitcpio configuration
sudo vim /etc/mkinitcpio.conf
Find the HOOKS line and add sd-resume before filesystems. Your HOOKS line should look like:
HOOKS=(base systemd autodetect microcode kms modconf block keyboard sd-vconsole plymouth sd-resume filesystems)

Regenerate initramfs:
sudo mkinitcpio -P
Step 6: Configure Sleep Delay

Create systemd sleep configuration to set the 2-hour delay:
sudo vim /etc/systemd/sleep.conf
Add these lines:
[Sleep]
HibernateDelaySec=2h
Step 7: Configure Lid Switch Behavior

# Edit logind configuration
sudo vim /etc/systemd/logind.conf
Find and uncomment (remove #) these lines, or add them if they don't exist:
HandleLidSwitch=suspend-then-hibernate
HandleLidSwitchExternalPower=suspend-then-hibernate
Step 8: Apply Changes

# Restart logind service
sudo systemctl restart systemd-logind

# Reboot to apply all changes
sudo reboot
Step 9: Test Your Setup

After rebooting, verify everything works:
# Verify resume parameters are loaded
cat /proc/cmdline | grep resume

# Check swap is active
swapon --show

# Test hibernation manually
sudo systemctl hibernate
After confirming hibernation works, test suspend-then-hibernate:
sudo systemctl suspend-then-hibernate
Finally, test by closing your laptop lid and leaving it for 2+ hours.

Troubleshooting

Check system logs

journalctl -b -u systemd-suspend-then-hibernate
journalctl -b | grep -i hibernate
Verify resume parameters

cat /proc/cmdline
Should show resume=UUID=... and resume_offset=...
Check swap priority

cat /proc/swaps
Your zram and swap file should both be listed.

Notes


zram compatibility: Your existing zram will continue working. The kernel uses zram for regular swapping and the swap file specifically for hibernation.
Battery drain: During the first 2 hours, the system uses suspend-to-RAM (very low power). After 2 hours, it hibernates to disk (zero power).
Wake behavior: Opening the lid before 2 hours wakes instantly from RAM. After 2 hours, it resumes from disk (slightly slower but still quick).


Reverting Changes

If you need to undo this setup:
# Disable swap file
sudo swapoff /swap/swapfile

# Remove from fstab
sudo vim /etc/fstab  # Delete the /swap/swapfile line

# Remove swap file
sudo rm /swap/swapfile

# Restore logind settings
sudo vim /etc/systemd/logind.conf  # Change back to suspend

# Remove sleep configuration
sudo rm /etc/systemd/sleep.conf

# Remove resume from GRUB
sudo vim /etc/default/grub  # Remove resume parameters
sudo grub-mkconfig -o /boot/grub/grub.cfg

# Remove sd-resume hook
sudo vim /etc/mkinitcpio.conf  # Remove sd-resume
sudo mkinitcpio -P

# Reboot
sudo reboot

  
## suspend-then-hibernate-fedora.md

      
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              suspend-then-hibernate-fedora.md
            
          
    Suspend-Then-Hibernate Setup for Fedora 42

This guide configures suspend-then-hibernate on Fedora 42 with btrfs, GRUB, dracut, and zram. The system will suspend to RAM when you close the lid, then automatically hibernate to disk after 2 hours.
System specs: 32GB RAM, btrfs filesystem, GRUB bootloader, dracut initramfs, existing zram

Step 1: Create Swap File

Create a 38GB swap file for hibernation (RAM + sqrt(RAM)):
# Create swap subvolume
sudo btrfs subvolume create /var/swap

# Create swap file on btrfs
sudo btrfs filesystem mkswapfile --size 38G --uuid clear /var/swap/swapfile

# If the above command doesn't work (older btrfs-progs), use this method:
sudo truncate -s 0 /var/swap/swapfile
sudo chattr +C /var/swap/swapfile
sudo fallocate -l 38G /var/swap/swapfile
sudo chmod 600 /var/swap/swapfile
sudo mkswap /var/swap/swapfile
Step 2: Enable the Swap File

# Enable swap
sudo swapon /var/swap/swapfile

# Add to fstab for automatic mounting at boot
echo '/var/swap/swapfile none swap defaults 0 0' | sudo tee -a /etc/fstab

# Verify swap is active
swapon --show
Step 3: Configure SELinux (Fedora-specific)

Fedora uses SELinux, which needs to know about the swap file:
# Set correct SELinux context for swap file
sudo semanage fcontext --add --type swapfile_t /var/swap/swapfile
sudo restorecon -RF /var/swap
Step 4: Get Resume Parameters

You need two values for GRUB configuration:
# Get the UUID of your root partition
sudo findmnt -no UUID -T /var/swap/swapfile

# Get the physical offset of the swap file
sudo btrfs inspect-internal map-swapfile -r /var/swap/swapfile
Write down both values - you'll need them in the next step.
Step 5: Configure GRUB

Fedora uses grubby to manage kernel parameters. Add resume parameters (replace with your actual UUID and offset):
# Add resume parameters to all kernels
sudo grubby --args="resume=UUID=your-uuid-here resume_offset=your-offset-here" --update-kernel=ALL

# Verify the parameters were added
sudo grubby --info=ALL | grep args
Example:
sudo grubby --args="resume=UUID=12345678-1234-1234-1234-123456789abc resume_offset=123456" --update-kernel=ALL
Step 6: Configure Dracut (initramfs)

Add the resume module to dracut:
# Create dracut configuration for resume
echo 'add_dracutmodules+=" resume "' | sudo tee /etc/dracut.conf.d/resume.conf
Regenerate initramfs for all kernels:
sudo dracut --regenerate-all --force
Step 7: Configure Sleep Delay

Create systemd sleep configuration to set the 2-hour delay:
sudo vim /etc/systemd/sleep.conf
Add these lines:
[Sleep]
HibernateDelaySec=2h
Step 8: Configure Lid Switch Behavior

# Edit logind configuration
sudo vim /etc/systemd/logind.conf
Find and uncomment (remove #) these lines, or add them if they don't exist:
HandleLidSwitch=suspend-then-hibernate
HandleLidSwitchExternalPower=suspend-then-hibernate
Step 9: Apply Changes

# Restart logind service
sudo systemctl restart systemd-logind

# Reboot to apply all changes
sudo reboot
Step 10: Test Your Setup

After rebooting, verify everything works:
# Verify resume parameters are loaded
cat /proc/cmdline | grep resume

# Check swap is active
swapon --show

# Verify dracut has resume module
sudo lsinitrd -m | grep resume

# Test hibernation manually
sudo systemctl hibernate
After confirming hibernation works, test suspend-then-hibernate:
sudo systemctl suspend-then-hibernate
Finally, test by closing your laptop lid and leaving it for 2+ hours.

Troubleshooting

Check system logs

journalctl -b -u systemd-suspend-then-hibernate
journalctl -b | grep -i hibernate
Verify resume parameters

cat /proc/cmdline
Should show resume=UUID=... and resume_offset=...
Check swap priority

cat /proc/swaps
Your zram and swap file should both be listed.
SELinux issues

If hibernate fails with "Access denied", check SELinux:
sudo ausearch -m avc -ts recent
sudo audit2allow -a
Verify dracut module

sudo lsinitrd -m | grep resume
Should show resume in the module list.

Notes


zram compatibility: Your existing zram will continue working. The kernel uses zram for regular swapping and the swap file specifically for hibernation.
Battery drain: During the first 2 hours, the system uses suspend-to-RAM (very low power). After 2 hours, it hibernates to disk (zero power).
Wake behavior: Opening the lid before 2 hours wakes instantly from RAM. After 2 hours, it resumes from disk (slightly slower but still quick).
Secure Boot: Hibernation works with Secure Boot on modern Fedora versions that support hibernation resume verification.


Reverting Changes

If you need to undo this setup:
# Disable swap file
sudo swapoff /var/swap/swapfile

# Remove from fstab
sudo vim /etc/fstab  # Delete the /var/swap/swapfile line

# Remove swap file and subvolume
sudo rm /var/swap/swapfile
sudo btrfs subvolume delete /var/swap

# Restore logind settings
sudo vim /etc/systemd/logind.conf  # Change back to suspend

# Remove sleep configuration
sudo rm /etc/systemd/sleep.conf

# Remove resume from GRUB
sudo grubby --remove-args="resume resume_offset" --update-kernel=ALL

# Remove dracut resume module
sudo rm /etc/dracut.conf.d/resume.conf
sudo dracut --regenerate-all --force

# Reboot
sudo reboot
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