2019/05/23

UbuntuMate 18.04 無法鎖定畫面

開機後突然沒有辦法使用快速鍵「Ctrl + Alt + L」來鎖定畫面,覺得很不對對勁。

網路上看了幾篇文章以後,發現螢幕鎖定和 gnome 的 screen saver 都有關係,由於 UbuntuMate 的預設不是使用 gnome,所以找到的是 mate-screensaver-command:
$ mate-screensaver-command -h
Usage:
  mate-screensaver-command [OPTION…]

Help Options:
  -h, --help                 Show help options

Application Options:
  --exit                     Causes the screensaver to exit gracefully
  -q, --query                Query the state of the screensaver
  -t, --time                 Query the length of time the screensaver has been active
  -l, --lock                 Tells the running screensaver process to lock the screen immediately
  -c, --cycle                If the screensaver is active then switch to another graphics demo
  -a, --activate             Turn the screensaver on (blank the screen)
  -d, --deactivate           If the screensaver is active then deactivate it (un-blank the screen)
  -p, --poke                 Poke the running screensaver to simulate user activity
  -i, --inhibit              Inhibit the screensaver from activating.  Command blocks while inhibit is active.
  -n, --application-name     The calling application that is inhibiting the screensaver
  -r, --reason               The reason for inhibiting the screensaver
  -V, --version              Version of this application


由於之前腦包把 background daemon 關掉,所以螢幕保護服務沒有啟動,不管怎麼下指令都不會有反應。記得「啟動應用程式」中,把「螢幕保護程式」開啟,以免部份功能失效:



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