關閉Debian 11的睡眠、休眠等模式

最近安裝好的Debian 11 Bulleye開機一陣子就會睡著，睡著的狀態是電源燈會閃爍，硬碟燈全暗且螢幕沒有任何畫面。 推測睡著和系統設定有關。使用下面的指令來確認：

• systemctl status sleep.target suspend.target hibernate.target hybrid-sleep.target

若有看到下面的字樣，則代表系統有五花八門睡著的方式：

loaded (/lib/systemd/system/sleep.target; static)
loaded (/lib/systemd/system/suspend.target; static)
loaded (/lib/systemd/system/hibernate.target; static)
loaded (/lib/systemd/system/hybrid-sleep.target; static)

解決方法則是用下面指令關閉systemd上面會導致睡著的設定：

1. systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target
2. systemctl status sleep.target suspend.target hibernate.target hybrid-sleep.target

看到下面的字樣則代表成功關閉暫停、睡眠、休眠等狀態：

masked (Reason: Unit sleep.target is masked.)
masked (Reason: Unit suspend.target is masked.)
masked (Reason: Unit hibernate.target is masked.)
masked (Reason: Unit hybrid-sleep.target is masked.)

未來若要重新啟動休眠，則是使用下面指令

1. systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target

參考資料

• How to Disable Suspend and Hibernation Modes In Linux
• Normal suspend, suspend to RAM
  關掉大部分零件的電源，但保留記憶體的電源，這樣恢復的時間會比較短但還是會稍微吃一些電
• Hibernate, suspend to Disk
  完全關掉電源，整台系統的狀態都會塞到硬碟swap裡面，待回復的時候再轉出來，需要較長的時間
• Hybrid suspend, suspend to both
• How To: Disable Sleep And Hibernation on Ubuntu Server
• Correct way to execute a script on resume from suspend
• 如何在Linux中禁用和挂起休眠
• Understanding Suspend：Ubuntu系統進入suspend會做的動作

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