Sony pcv-rx780g 参考手册

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Configuring Your System
17
Changing Power Management Settings
Power Management capability is designed to enable your computer to 
reduce power or shut itself off after being idle for a specified period of 
time.
1
From the Start menu, point to Settings, click Control Panel, then click 
Display.
The Power Options Properties dialog box opens, with the Power 
Schemes tab displayed. 
2
Select the power scheme that is most appropriate for the way you use 
your computer.
To change a power scheme, change the settings for Turn off monitor, 
and Turn off hard disks, System stand by, and System hibernates.