If you can’t see your AHCI Link Power Management from the Power Options, there is a way to add it. Always backup your computer before modifying the registry.
You can add the GUID to the registry by going opening the registry (regedit) and creating a key under the following key -0012ee47-9041-4b5d-9b77-535fba8b1442
The easiest way is to copy the information in italics to notepad or notepad++ and save as AHCI.reg.
After saving this, double click on the .reg file and reboot.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\0012ee47-9041-4b5d-9b77-535fba8b1442\0b2d69d7-a2a1-449c-9680-f91c70521c60]
“Attributes”=dword:00000002
So what are the settings used for? Using DIPM can add 7% to 8% more battery time according to some articles.
| Index | Name | Description |
|---|---|---|
| 0 | Active | Link power management is not used. |
| 1 | HIPM | Host-Initiated Power Management (HIPM) is used. |
| 2 | HIPM and DIPM | HIPM and Device-Initiated Power Management (DIPM) are used. |
TCAT Shelbyville - ITIM 
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