AMD Adaptive S4 ACPI device driver distribution list
Version 1.1.0.0022, 05/19/2015

Supported chipsets
N/A

Supported OS
Win8, Win8.1 & Win10 x86/64

Introduction
AMD Adaptive S4 ACPI driver is a communication vehicle between the App and the BIOS’ adaptive S4 related ACPI objects.
There are one main functions for the filter driver. 
1.	Get AdaptiveTimers from ACPI objects and transfer AdaptiveTimers setting to ACPI objects.

System Requirements
Ensure that you are using a supported operating system and have the adaptive S4 related ACPI objects which is defined in BIOS.

Included Files
The following files are included in driver package.
File			Description
x86\AmdAS4.sys     	32-bit Adaptive S4 ACPI device driver
x64\AmdAS4.sys	64-bit Adaptive S4 ACPI device driver
AmdAS4.inf         	Installation setup script
AmdAS4.cat         	Digital signature (only if the driver is certified)

Installation Notes

These instructions explain how to install/uninstall the AmdAS4 driver:
Note:  For driver installation, you must log in as administrator or have administrator rights for your domain login.

The driver can be installed either by running the CIM installer or by Device Manager install.
Install/Uninstall Using INF File
To install
a. Run Device Manager, select device item which Device Id equal ASD0001.
b. Right-click the device item, and then chose Update driver software, and then follow the instruction step by step. 
c. After installation is complete, reboot the computer.
To uninstall
a. Run Device Manager, select device item which Device Id equal ASD0001.
b. Right-click the device item, and then chose Uninstall, and then chose delete driver software from device. Then follow the instruction step by step. 
c. After uninstall is complete, reboot the computer.

Using Catalyst Install Manager
You can install/uninstall the driver by running the CIM installer. This method will correctly show the driver as WHQL certified in the Device Manager.

Implementation Notes

Revision History

Version  1.1.0.0022 (05/19/2015)
      -   Win10 Support added   

Version  1.1.0.0022 (10/24/2013)
      -   support AS4 2.0   

Version 1.1.0.0017 (02/07/2013)
      -   Restrict to only support Win8 OS and fix issue with CIM cannot uninstall
                                                                                            
Version 1.1.0.0012 (11/06/2012)                                                   
      -   Disable AS4 timer when ACPI driver detects the target system state is S5
      
Version 1.1.0.0011 (10/24/2012)
      -   Initial release
          support internal and public release.Only Win 8.