设置设备的闲置时间

可以指定系统设备（例如屏幕）在开始使用其低电源模式以前闲置时间的长度。要如此行，请改变 /etc/power.conf 文件中的阈值字段。

改变闲置时间的长度

1. 作为超级用户，编辑 /etc/power.conf 文件。 键入：

   example# vi /etc/power.conf

2. 修改需要的条目。

   如下所示，/etc/power.conf 文件中键盘和鼠标设备的闲置阈值已改为 300 秒（5 分钟）。

   ---

   # Power Management Configuration File
   #
   # Putting an entry in this file will only be effective if the 
   # driver for the device supports device power management. 
   # After the file is modified, pmconfig(1M) command must be
   # executed to activate the new change.
   #
   # Fields must be separated by white space or semicolons.
   # Note that physical dependents are automatically considered
   # by the power management framework.
   # Name           Threshold(s)       Logical Dependent(s)
   /dev/kbd         300
   /dev/mouse       300
   # NOTE: The entries below are only used when no window
   # system is running. When running the window system, monitor
   # power management is done by the screen saver functions.
   
   /dev/fb          0 0         /dev/kbd     /dev/mouse
   
   # Auto-Shutdown  Idle(min)  Start/finish(hh:mm)  Behavior
   autoshutdown     30          9:00 9:00           default
   
   statefile        /.CPR>

   ---

3. 将新的设定值通知"电源管理"框架，键入：

   example# /usr/sbin/pmconfig

   运行 pmconfig 即根据目前在 /etc/power.conf 文件中定义的阈值将新的设定值通知了"电源管理"框架。