Runtime Power Management, v 1.0

Advantages of using EIST/Cool’n’Quiet

Enabling EIST/Cool’n’Quiet provides the following benefits:

• Increased power savings.

• Lower operating costs.

• Less heat production.

• Potential for less noise from slow fan speeds.

Disadvantages of using EIST/Cool’n’Quiet

There are no known disadvantages to using EIST/Cool’n’Quiet if you use the latest HP BIOS and/or the

latest service packs for Microsoft operating systems.

Known Issues

• There are known EIST compatibility issues for i915/i945 systems using older Intel processors, older

HP BIOS, and older Windows XP service packs. These problems may include both Windows blue

screens and operating system hangs/delays. These issues have been fixed in the following:

• HP BIOS for DDR i915 systems - 786C1 v2.14 or later

• HP BIOS for DDR2 i915 systems - 786C2 v1.06 or later

• Windows XP Service Pack 2

• Windows Server 2003 Service Pack 1

Systems running Windows XP Service Pack 2 with older Intel processors that only support TM2 do not

provide RTPM capability. Windows XP Service Pack 2 supports RTPM for only EIST processors.

• Windows XP may report inaccurate processor speed. For more information about this issue, as well

as information about determining processor speed, see the following Microsoft Knowledge Base arti-

cles:

http://support.microsoft.com/default.aspx?scid=kb;en-us;316965&Product=winxp

http://support.microsoft.com/default.aspx?scid=kb;en-us;888282

• Windows XP on portable computers may display the following message: STOP 0x000000D1. For

more information about this error message, see the following Microsoft Knowledge Base article:

http://support.microsoft.com/default.aspx?scid=kb;en-us;888399