ubuntu 点亮屏幕命令

装了个ubuntu touch ，发现息屏状态下程序跑起来很慢，点亮就快，怀疑是节省能源的逻辑在降低CPU 的频率，所以希望点亮屏幕再执行脚本，执行完再关闭

powerd-cli display

帮助文档：

Usage: powerd-cli <command>
Available commands: 
  display [on]: keep display on until program is terminated
  active: inhibit device suspend until program is terminated
  settings inactivity <power_action> <power_supply> <timeout>
  settings lid <power_action> <power-supply>
  settings critical-power <power_action>

<power_action>: none, display-off, suspend, power-off
<power_supply>: battery, line-power