Keep the PC in low power, but not sleeping, disable sleep, disable suspend, disable lid close, disable monitor sleep

If you don't want the laptop went to sleep or if you closed the lid, or low-power mode for continuous operation of clients or servers.

You can try the following.

These are separate alternatives for solving the problem.

They can be used individually or in combination.

1. /etc/systemd/logind.conf

Edit and uncomment this lines in /etc/systemd/logind.conf

``` HandleLidSwitch=ignore HandleLidSwitchExternalPower=ignore HandleLidSwitchDocked=ignore ``` 

Restart with :

systemctl restart systemd-logind

2. cpufrequtils

Install and run cpufrequtils

`apt install cpufrequtils` 

Set the CPU governor to powersave

`cpufreq-set -r -g powersave` 

• How to use cpufrequtils
• cpufreq-info(1)

3. systemctl

Disable suspend with systemctl

• How do I disable my system from going to sleep?

4. linux-tools-generic

Use cpupower from the linux-tools-generic

``` apt install linux-tools-generic cpupower frequency-set -g powersave cpupower frequency-set -d <min_frequency> ``` 

• cpupower - Shows and sets processor power related values
• How to install cpupower on Ubuntu 20.04 with kernel 5.17+
• How to install cpupower on Ubuntu 14.04 (kernel 4.6.0)

Do a reboot after you change it.

5. With Systemd:

Disable sleep settings with:

sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

Reboot your system

• How to permanently disable sleep/suspend?

6. Try over UPower

Edit /etc/UPower/UPower.conf and set:

IgnoreLid=true IdleAction=none 

Restart with:

systemctl restart upower

• Stop laptop from suspending when closing lid in lightdm

7. More Sources and Solutions:

• How do I stop my Ubuntu desktop computer from "sleeping" when nobody is logged in?
• Ubuntu 22.04 is sleeping even though I changed the power settings so it shouldn't sleep
• How To: Disable Sleep And Hibernation on Ubuntu Server
• How to Prevent Ubuntu from Going into Sleep Mode
• Disable Suspend and Hibernation Modes In Linux
• Screen doesn't turn on after closing laptop lid

8. Blacklisting ideapad_laptop module

For some devices, you need to make changes and use kernel modules and GRUB settings.

Blacklisting ideapad_laptop module solves the problem completely. I did it by editing a line in /etc/default/grub to be GRUB_CMDLINE_LINUX_DEFAULT='quiet splash module_blacklist=ideapad_laptop'. Will this affect the Windows system? Also, where does the ideapad_laptop module come from (e.g. BIOS)?

This change normally won't affect your windows system because the GRUB bootloader configuration and the blacklisted module only apply to your Linux environment. The ideapad_laptop module is part of the Linux kernel, and Windows doesn't interact with it.

The module it is included in the Linux kernel for handling certain power and hardware management features specific to Lenovo Ideapad models.

Laptop suddenly shuts down when opening or closing lid during sleep

9. setterm --blank force

One way to turn off the screen manually, with physical or remote access to the device.

Here, the settings are applied only via SSH, turning the screen on and off, as in this example.

Without SSH, I can only reactivate the screen display with a hard reboot if i use setterm --blank force with physical access to the device, I also couldn't switch to a console TTY*.

How can I turn the screen back on using setterm or another command, only with the core utilities over ssh?