Suspend or sleep mode

확인 

root@guest:~# systemctl status sleep.target suspend.target hibernate.target hybrid-sleep.target
● sleep.target - Sleep
     Loaded: loaded (/lib/systemd/system/sleep.target; static; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:systemd.special(7)

● suspend.target - Suspend
     Loaded: loaded (/lib/systemd/system/suspend.target; static; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:systemd.special(7)

● hibernate.target - Hibernate
     Loaded: loaded (/lib/systemd/system/hibernate.target; static; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:systemd.special(7)

● hybrid-sleep.target - Hybrid Suspend+Hibernate
     Loaded: loaded (/lib/systemd/system/hybrid-sleep.target; static; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:systemd.special(7)
root@guest:~# 



기능 off 


root@guest:~# systemctl mask  sleep.target suspend.target hibernate.target hybrid-sleep.target           
Created symlink /etc/systemd/system/sleep.target → /dev/null.
Created symlink /etc/systemd/system/suspend.target → /dev/null.
Created symlink /etc/systemd/system/hibernate.target → /dev/null.
Created symlink /etc/systemd/system/hybrid-sleep.target → /dev/null.
root@guest:~# 
root@guest:~# 
root@guest:~# systemctl status sleep.target suspend.target hibernate.target hybrid-sleep.target
● sleep.target
     Loaded: masked (Reason: Unit sleep.target is masked.)
     Active: inactive (dead)

● suspend.target
     Loaded: masked (Reason: Unit suspend.target is masked.)
     Active: inactive (dead)

● hibernate.target
     Loaded: masked (Reason: Unit hibernate.target is masked.)
     Active: inactive (dead)

● hybrid-sleep.target
     Loaded: masked (Reason: Unit hybrid-sleep.target is masked.)
     Active: inactive (dead)
root@guest:~#