This video looks at power configuration in Windows 7. This includes how sleep, hibernation, and hybrid sleep work as well as the power plans included with Windows. Power plans allow you to group a number of power settings together and quickly and easily change between the power plans as required. Different power plans can also be configured for laptops when they are running off the battery and when they are plugged into the power.
Power configuration demo 04:40
Sleep Mode
When a computer is put into sleep mode, non essential devices like the hard disk and monitor are switched off. Power is still supplied to the RAM so the computer will continue from where it left off when the computer is woken up from sleep mode. The advantage of sleep mode is that the computer will not take long to spin up the hard disk and switch the other devices back on. The disadvantage with sleep mode is that power is still used. If you are running off of batteries, even in sleep mode the batteries will eventually run out and any unsaved data will be lost.
To start any of the power modes, select the start menu. For the sleep mode, select the additional option sleep under the start menu. Some laptops may also have the power button configured to put the laptop to sleep when it is pressed.
Hibernation Mode
When a computer is put into hibernation mode the contents of the RAM are saved to the hard disk. Once complete the computer is switched off. When the computer starts up again the contents of the RAM are read back into memory. This essentially means the laptop can stay in hibernation mode indefinitely since no power is being used. The disadvantage of hibernation mode is that it can take a while to save all of the RAM to the hard disk, especially if you have a lot of RAM.
Hybrid Sleep
Windows 7 also has another mode called Hybrid Sleep. This mode can only be enabled from inside the advanced settings inside power configuration. When this mode is enabled the computer will save the RAM to the hard disk like hibernation mode. The difference is that the computer will not shut down, but instead will go into sleep mode. While there is power, the computer will quickly return back to where it was just like sleep mode. If power is lost then the contents of RAM will be lost. Just like hibernation mode, when the computer is started up, the contents of RAM are read from the hard disk and the computer is restored back to where it was.
Other power options
To save power, Windows allows devices to be switched off or have their power reduced. For example, the screen could be switched off or dimmed. The basic settings allows you to switch off devices like hard disks. Windows also has more advanced options which can configure power options for devices like network adapters. Once you work out which settings you want these can be saved in a power plan.
Power plan
A power plan allows you to group a number of settings together. This allows you to quickly change between power plans. Windows 7 comes with 3 different power plans that you can customize or use as a template to create a new power plan.
Balanced power plan
This default power plan provides a balance between power consummation and performance. In this plan devices are shutdown when they are idle for too long.
High performance
The high performance plan is designed to give you the most performance out of all the plans. Devices like the hard disk are not shut down even when the system is idle. This means that the system will not be sluggish to respond even when you leave it for a long time.
Power saver
The power saver plan will use the least amount of power, but does give you the worst user experience out of all the power plans. This plan will ensure that if you are using a laptop off of batteries it will last as long as possible.
PowerCFG
A lot of the power configuration can be done in the command line using the PowerCFG command. The commands used in this video are:
PowerCFG --list
PowerCFG --devicequery wake_from_any
PowerCFG --energy
PowerCFG --export (FileName) (Guid)
PowerCFG --delete (Guid)
PowerCFG --import (Fill filename and path)
PowerCFG /?
Group Policy
The group policy settings for power are found under
Computer configuration-Administrative templates-System-Power Management.
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MCTS 70-680: Power Options | |
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| Education | Upload TimePublished on 15 Dec 2011 |
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