使用电源管理

power.conf 文件

/etc 目录下的 power.conf 文件让用户设置管理系统电源的配置。该文件还让用户能设定显示器电源配置;当没有 CDE 或 OpenWindows 桌面时,该显示器便可依循该配置。(要获得在那些窗口环境下管理显示器电源的详情,参见 第 2 章,显示器电源的管理 。)

默认的 /etc/power.conf 文件具有以下内容:


# 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         1800
/dev/mouse       1800
# 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>

逻辑从属部分

/etc/power.conf 文件中,有一些"逻辑从属部分"( Logical Dependent)的条目。每一逻辑从属部分均是物理设备(例如鼠标),它具有与另一设备 (例如整缓冲区)相关的活动,但并未从物理上与其连接。

如果逻辑从属设备处于活动状态,则主设备也被视为处于活动状态。这影响到主设备的闲置时间。