桌機換成 Xubuntu 22.04 後會遇到手動鎖定螢幕時，螢幕不會進入省電模式，遇到的情況有點像是「DPMS Suspend on Screen Lock」這邊提到的情境。
這類問題如果用 search engine 一時間沒有找到解法的話，最好的方法都是直接去讀 source code，然後就發現透過 Ctrl+Alt+L 觸發的 /usr/bin/xflock4 其實是個 shell script，從 code 讀可以發現裡面只負責 lock 的部分，本來就跟 DPMS 無關。
我在下面提供的方案就是自己處理螢幕的部分，也就是自己先跑 DPMS 指令，然後再回頭呼叫 /usr/bin/xflock4：
#!/bin/sh
/usr/bin/xset dpms force off
exec /usr/bin/xflock4
把 Ctrl+Alt+L 的觸發程式掛上來，這樣就會正常處理了…
ufabet
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