Hi，there
Please check if you can enable it in these few ways:
1.Using the systemctl command
In modern Linux systems, you can control power management with the systemctl command. Here are two common suspend modes:
Suspend to RAM (Suspend-to-RAM):
This is a common way to enter deep suspend mode. The system shuts down most hardware, keeping only memory active to allow for quick recovery.
bash
sudo systemctl suspend
Suspend to Disk (Hibernate):
In this mode, the current system state is written to disk and the power is turned off. When resumed, the system loads the data from disk and restores to its previous state. This method usually requires a swap partition or swap file large enough to store the system state.
bash
sudo systemctl hibernate
2.
Configuring Deep Suspend Mode (Hibernate)
If hibernation is not enabled by default on your system, you may need to configure it manually. Ensure that your system has a sufficiently large swap partition or swap file to save the system state.
Check if your system supports hibernation:
bash
sudo cat /sys/power/state
If the output contains hibernate, the system supports hibernation.
Ensure that your swap partition is large enough (typically needs to be equal to or larger than your memory size) and configure it in /etc/fstab.
Enable hibernation:
Edit the /etc/systemd/logind.conf file and ensure the following setting:
ini
HandleLidSwitch=hibernate
Then reload the configuration:
bash
sudo systemctl restart systemd-logind
3.
Using pm-utils or uswsusp (Older Tools)
In some older Linux distributions, pm-utils or uswsusp are common tools used to manage power and suspend.
Suspend to RAM:
bash
sudo pm-suspend
Suspend to Disk:
sudo pm-hibernate
4.
Using TLP Tool for Power Management
TLP is a Linux power management tool that automatically configures many power optimization options. Once installed and configured, TLP will manage deep suspend and other features based on your hardware.
bash
sudo apt install tlp
5.Checking Power Management Services
If your system encounters issues while entering deep suspend, you can check the power management services to diagnose the problem. For example, check the systemd power management logs:
journalctl | grep suspend
