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To display detailed help for powercfg.exe, type powercfg / at a command
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To list the available power plans (called power schemes) in Powercfg .exe:
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C:\Windows\system32\>powercfg -L Existing Power Schemes (* Active) ----------------------------------Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a (Balanced) (High performance) * (Power saver)
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Listing power schemes lets you determine the GUID for each scheme . The asterisk beside the High Performance scheme indicates that it is the active power plan . You can also determine the active power scheme quickly as follows .
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C:\Windows\system32\>powercfg -getactivescheme Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c (High performance)
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To display detailed information concerning the High Performance power scheme in the preceding example, see the code here (the output has been truncated) .
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C:\Windows\system32\>powercfg -q 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c Subgroup GUID: fea3413e-7e05-4911-9a71-700331f1c294 subgroup)
(High performance) (Settings belonging to no (Require a password on
Power Setting GUID: 0e796bdb-100d-47d6-a2d5-f7d2daa51f51 wakeup) Possible Setting Index: 000 Possible Setting Friendly Name: No Possible Setting Index: 001 Possible Setting Friendly Name: Yes Current AC Power Setting Index: 0x00000001 Current DC Power Setting Index: 0x00000001 Subgroup GUID: 0012ee47-9041-4b5d-9b77-535fba8b1442 Minimum Possible Setting: 0x00000000 Maximum Possible Setting: 0xffffffff Possible Settings increment: 0x00000001 Possible Settings units: Seconds Current AC Power Setting Index: 0x000004b0 Current DC Power Setting Index: 0x000004b0 Subgroup GUID: 0d7dbae2-4294-402a-ba8e-26777e8488cd Possible Setting Index: 000 Possible Setting Friendly Name: Available Possible Setting Index: 001 Possible Setting Friendly Name: Paused Current AC Power Setting Index: 0x00000000 Current DC Power Setting Index: 0x00000000 Subgroup GUID: 19cbb8fa-5279-450e-9fac-8a3d5fedd0c1 Possible Setting Index: 000 Possible Setting Friendly Name: Maximum Performance Possible Setting Index: 001 Possible Setting Friendly Name: Low Power Saving Possible Setting Index: 002 Possible Setting Friendly Name: Medium Power Saving Possible Setting Index: 003 Possible Setting Friendly Name: Maximum Power Saving Current AC Power Setting Index: 0x00000000 Current DC Power Setting Index: 0x00000000...
(Hard disk) (Turn off hard disk after)
Power Setting GUID: 6738e2c4-e8a5-4a42-b16a-e040e769756e
(Desktop background settings) (Slide show)
Power Setting GUID: 309dce9b-bef4-4119-9921-a851fb12f0f4
(Wireless Adapter Settings) (Power Saving Mode)
Power Setting GUID: 12bbebe6-58d6-4636-95bb-3217ef867c1a
The following code changes the active power scheme to Balanced in the preceding example .
Understanding Power Management CHapTER 17
C:\Windows\system32\>powercfg setactive SCHEME_BALANCED
Verify the result as follows .
C:\Windows\system32\>powercfg -L Existing Power Schemes (* Active) ----------------------------------Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a (Balanced) * (High performance) (Power saver)
The following code determines the available Sleep states supported by the system .
C:\Windows\system32\>powercfg -a The following sleep states are available on this system: Standby ( S1 S3 ) Hibernate Hybrid Sleep The following sleep states are not available on this system: Standby (S2) The system firmware does not support this standby state.
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For information concerning the differences between these different Sleep
states, see http://msdn2.microsoft.com/en-gb/library/ms798270.aspx.
The following code displays the source that has awakened the system from sleep .
C:\Windows\system32\>powercfg -lastwake Wake History Count - 1 Wake History [0] Wake Source Count - 1 Wake Source [0] Type: Device Instance Path: ACPI\PNP0C0C\2&daba3ff&1 Friendly Name: Description: ACPI Power Button Manufacturer: (Standard system devices)
The following code changes the monitor time-out when running on AC power for the active power scheme to 30 minutes .
C:\Windows\system32\>powercfg -setacvalueindex SCHEME_CURRENT SUB_VIDEO VIDEOIDLE 1800 C:\Windows\system32\>powercfg setactive SCHEME_CURRENT
The following code exports a power scheme to a .pow file (proprietary binary format) .
C:\Windows\system32\>powercfg -export C:\newscheme.pow 8c5e7fda-e8bf-4a96-9a85a6e23a8c635c
Use the import switch to import a .pow file .
CHapTER 17
Managing Devices and Services
The following code disables hibernation on the computer .
C:\Windows\system32\>powercfg h off
To evaluate the energy efficiency of the computer, first close all applications and documents, let the system remain idle for 10 minutes, and then run the following command .
C:\Windows\system32>powercfg energy Enabling tracing for 60 seconds... Observing system behavior... Analyzing trace data... Analysis complete. Energy efficiency problems were found. 7 Errors 1 Warnings 11 Informational See C:\Windows\system32\energy-report.html for more details.
Opening the Hypertext Markup Language (HTML) file generated by the command displays a Power Efficiency Diagnostic Report with errors, warnings, and informational issues . Figure 17-10 shows the error section of a report run on an older system that is not configured for optimal energy efficiency .
FIgURE 17-10 Part of a Power Efficiency Diagnostic Report generated using powercfg energy
Understanding Power Management CHapTER 17
Configuring power Management Settings Using the power WMI provider
Windows 7 now includes a WMI provider that lets you configure power policy through the standard WMI interface . Using this provider, you can script actions such as:
Changing power setting values by using the Win32_PowerSetting class . Activating a specific power plan by using the Win32_Plan.Activate() method .
See MSDN for more information on using WMI to manage power settings in
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Windows 7.
Understanding Services
Services are long-running applications that run in the background, typically start up on boot, and run independently of users who log on . Services handle low-level tasks such as managing authentication and networking and other tasks that need little or no user interaction to function . Third-party services, such as firewalls and antivirus software, can also run on Windows . Services are implemented using the Services API and are managed by the Service Control Manager (SCM) . SCM maintains a database of information concerning the services installed on the system and exposes these services to management using both UI and command-line tools . Using these tools, administrators can:
Configure a service to start automatically on system startup, to start the service manually on demand, or to disable the service . Start, stop, pause, and resume a service (depending on whether it is currently running) . Specify a security context under which the service runs typically one of the following: LocalSystem; a lower-privileged identity such as LocalService or NetworkService; or a custom user account created specifically for the service . Specify recovery actions to be taken when the service fails . View the dependencies of a service on other services .
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