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When you install Microsoft Windows XP on a computer with an AMD Mobile Athlon XP-M 2000+ or later processor, you may not be able to use the AMD PowerNow! Technology power management features. As a result, you may experience decreased battery life, decreased performance, and warmer operating temperatures.
This problem may occur if the generic Processor.sys driver is loaded instead of the Amdk7.sys driver. The CPUID has been changed on AMD Athlon XP-M 2000+ and later processors. For the Amdk7.sys driver to start correctly on these processors, the driver's .inf file must be modified to include the CPUID for the AMD K7 Model 10 processors.The Amdk7.sys driver provides support for AMD PowerNow! Technology on AMD Mobile Athlon processors.
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP service pack
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
The global version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name ----------------------------------------------------- 17-Dec-2002 18:16 5.1.2600.1152 32,512 Amdk7.sys
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.
For additional information about AMD Power Now! Technology and Windows XP, click the following article numbers to view the articles in the Microsoft Knowledge Base:
318891 AMD PowerNow! Technology Support for Windows XP
306458 AMD PowerNow! Functionality May Require a Driver for AMD Mobile Athlon 4 and Duron Processors with Windows XP
815624 How to Enable AMD PowerNow! Functionality for a New Installation of Windows XP
Note If you use Windows Vista, you can visit the following Microsoft Web page for help with power consumption and battery life problems: