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

How to Turn On or Off PCIe Link State Power Management in Windows​


   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.
Advanced_Power_Options.jpg Advanced_Power_Options-2.jpg






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Click to expand...
Good tutorial Arc. :)
 

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:ditto: :thumbsup:
 

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Nice work Arc
 

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Thank you Golden :)
 

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Nice Tutorial Archie, just came across it now! :o :p
 

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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?
 

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alikhan said:
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?
Click to expand...


Hello Ali,

I added more info in the tutorial for PCIe Link State Power Management to help answer your question. :)
 
Last edited:

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  • Like
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Great info, Shawn :) Thanks a lot for adding it :)
 

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You're most welcome Arc. :)
 

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Nice tutorial Arc,

But when i Run a Power Efficiency Diagnostics Report and see the results, it says the PCIe Link State Power Management (ASPM) is already disabled by the operating system and the OS has a well known incompatibility, might be because a GPU card is installed.

Whenever i disable/enable in my Power Plan settings, it has no effect!:(
 

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Last edited:

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Hello NoN,

You might check your BIOS settings to see if it may have an option to disable the PCIe link state as well. If it does, it will override the power settings in Windows.

Hope this helps. :)
 

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Thanks!

I'll check that tomorrow & edit...getting late around here!

EDIT:
I'm using iGPU with Lucidlogix Virtu MVP, for iGPU & dGPU Virtualization.

I Think i"ll have to disable the Intel Technology Render Standby in Bios Settings, then in my Power Plan Settings disable the PCIe Link State Power Management.

But at the moment i do not know surely if that is any kind of a benefit for that Link state Power Management. It should mean both are running constantly.
 
Last edited:

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Can't find PCI Express and Link State Power Management

hello,

following your instructions i can't find the entry for Link State Power Management inside the pci category.

(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)

i looked already in my ami bios of my asrock P67 Pro3 motherboard and saw that everything seems to be enabled.

any idea what to do?
the energy report claims the Link State Power Management still as a failure.


thanks
harald
 

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Let us see a screenshot of Power options Advanced settings, with PCIe expanded?
 

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Screenshot

It's in german and should mean something like:

Connection Status Energy Management


Thanks
Harald
 

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Unfortunately I dont know German, but if you click here ....

2013-11-07_202235.jpg

You will get the options to change it.
 

My Computer

Computer type
PC/Desktop
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Gigabyte Technology Co., Ltd. B85M-D3H
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Corsair Vengence 4GB x2 (8.00GB Dual-Channel DDR3 @ 798MHz)
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2047MB GeForce GTS 450 (ZOTAC International)
Sound Card
Onboard (Realtek High Definition Audio)
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LG Flatron E2040T
Screen Resolution
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Hard Drives
Western Digital 1 TB
Seagate 500 GB
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