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Link State Power Management is a part of the PCI Express Power Management Settings in Power Options that allows users to specify the Active State Power Management (ASPM) policy to use for capable links when the link is idle.

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).

Users can specify the following ASPM policies below:

Off = Turn off ASPM for all links.

Moderate power savings = The system attempts to use the L0 state when the link is idle.

Maximum power savings = The system attempts to use the L1 state when the link is idle.

This tutorial will show you how to add or remove the Link State Power Management setting under PCI Express in Power Options for all users in Windows 7, Windows 8, and Windows 10.

You must be signed in as an administrator to be able to add or remove this setting in Power Options.

EXAMPLE: "Link State Power Management" in Power Options
Name:  Link_State_Power_Management_in_Power_Options.png
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Here's How:
Note   Note
The downloadable .reg files below will modify the DWORD value in the registry key below.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\501a4d13-42af-4429-9fd1-a8218c268e20\ee12f906-d277-404b-b6da-e5fa1a576df5

Attributes DWORD

1 = Remove
2 = Add


1. Do step 2 (add) or step 3 (remove) below for what you would like to do.


 2. To Add "Link State Power Management" to Power Options

NOTE: This is the default setting.

A) Click/tap on the Download button below to download the file below, and go to step 4 below.

Add_Link_State_Power_Management_to_Power_Options.reg

download


 3. To Remove "Link State Power Management" from Power Options

A) Click/tap on the Download button below to download the file below, and go to step 4 below.

Remove_Link_State_Power_Management_from_Power_Options.reg

download

4. Save the .reg file to your desktop.

5. Double click/tap on the downloaded .reg file to merge it.

6. When prompted, click on Run, Yes (UAC), Yes, and OK to approve the merge.

7. You can now delete the downloaded .reg file if you like.


That's it,
Shawn