How to Prevent a Linux Laptop from Entering Sleep Mode When the Lid is Closed
Initially, I thought it would be a simple setting adjustment, so I casually Googled it. Sure enough, there was a unanimous solution: modify /etc/systemd/logind.conf
, change HandleLidSwitch
to ignore
or lock
, and then restart logind
or reboot.
I tried this, but it didn’t work at all on my Thinkpad X230. I then tried changing some other options in the aforementioned file, but none worked, and surprisingly, Ubuntu
even reported errors.
So, I reinstalled the more preferred Debian
. Tried again, and it still didn’t work. Finally, I found a more brutal method.
systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target
This directly points these units to /dev/null…
To revert, simply use:
systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target
It’s simple and effective.
Update:
If you only mask them, the CPU usage of systemd-logind will be very high because it continuously attempts to sleep. Therefore, you also need to change HandleLidSwitch
and others to ignore
. As follows:
HandleSuspendKey=ignore
HandleHibernateKey=ignore
HandleLidSwitch=ignore
HandleLidSwitchExternalPower=ignore
HandleLidSwitchDocked=ignore
Then, execute systemctl restart systemd-logind
. For more details, refer to this: SystemD-LoginD High CPU Usage.