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Windows 7: PCIe Link State Power Management - Turn On or Off in Windows



PCIe Link State Power Management - Turn On or Off in Windows

How to Turn On or Off PCIe Link State Power Management in Windows
Published by Arc
07 Jun 2013
Published by
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How to Turn On or Off PCIe Link State Power Management in Windows


information   Information
The Link State Power Management is a part of PCI Express Active State Power Management (ASPM). The link State of a PCIe Device is converted from L0 (on) to L1 (off) when the link is not transferring data. The hardware is automatically converted to L0 again when data is available to transfer across the link.

There are basically 2 levels of power management in the PCI Express options. The difference between these 2 options are the power savings versus the Latency (Time to recover from the Sleep state).

  • If you select Off, there is no power savings, and the current will run regardless of what state the laptop is in. (depending on if your laptop is plugged in or not).
    • On battery: Off = PCI Express will communicate even when using battery power.
    • Plugged in: Off = PCI Express will communicate when plugged in as well.
  • If you select Moderate Power Savings, the power savings are less, but the time to recover from the Sleep state (latency) is much shorter.
  • If you select Maximum Power Savings, the power savings are greater, but the time to recover from the Sleep state (latency) is much longer.

Sometimes this mechanism cause a bit trouble during power transitions, specially during sleep. So it may be wanted to turn the Link State Power Management off, if necessary.



This tutorial will show you how to turn on or off the PCI Express Link State Power Management in Vista, Windows 7, and Windows 8.




How to Do it:


1. Open your advanced power plan settings in Vista/Windows 7 or Windows 8.

2. Scroll down and expand PCI Express and Link State Power Management. (see screenshots under step 5)

3. Do step 4 or 5 for what you would like to do.

4. To Turn Off PCI Express Link State Power Management
A) Under Setting (no battery) or On battery and Plugged in, open the drop down menu, select Off, and click/tap on OK.
5. To Turn On PCI Express Link State Power Management
A) Under Setting (no battery) or On battery and Plugged in, open the drop down menu, select either Moderate power savings or Maximum power savings for what you want, and click/tap on OK.
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07 Jun 2013   #1
Brink
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 

Good tutorial Arc.

My System SpecsSystem Spec
.

07 Jun 2013   #2
koolkat77

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium 64Bit
 
 

My System SpecsSystem Spec
08 Jun 2013   #3
Arc

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium 64 Bit SP 1
 
 

Quote   Quote: Originally Posted by Brink View Post
Good tutorial Arc.
Thanks for everything, Shawn
Quote   Quote: Originally Posted by koolkat77 View Post
And thanks for the inspiration
My System SpecsSystem Spec
12 Jun 2013   #4
Golden

Microsoft Community Contributor Award Recipient

Windows 7 Ult. x64 Windows 8.1 x64 Ubuntu 12.04 LTS Tri-Boot
 
 

Nice work Arc
My System SpecsSystem Spec
12 Jun 2013   #5
Arc

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium 64 Bit SP 1
 
 

Thank you Golden
My System SpecsSystem Spec
22 Jun 2013   #6
x BlueRobot

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x86 Service Pack 1 - Linux Mint Mate 14 x64
 
 

Good Tutorial, I've noticed it now when you posted it in the thread
My System SpecsSystem Spec
11 Jul 2013   #7
Northernsoul55

Microsoft Community Contributor Award Recipient

Windows 7 Professional 64bit
 
 

Nice Tutorial Archie, just came across it now!
My System SpecsSystem Spec
11 Jul 2013   #8
Arc

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium 64 Bit SP 1
 
 

Quote   Quote: Originally Posted by Northernsoul55 View Post
Nice Tutorial Archie, just came across it now!
Thanks Dave

I would be happy if you found it useful anytime
My System SpecsSystem Spec
27 Jul 2013   #9
alikhan

Windows 7 Ultimate x64
 
 

Nice tutorial archie a little more explanation about PCIe Link State Power Management in the information section of the tutorial would help user who are not aware of it, like me.
In my desktop pc it is Moderate power savings so should i change it to maximum cause TDP of my card is 188W. Would it help save energy?
My System SpecsSystem Spec
Comment

 PCIe Link State Power Management - Turn On or Off in Windows




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