http://bugzilla.kernel.org/show_bug.cgi?id=5082





------- Additional Comments From [EMAIL PROTECTED]  2006-01-31 21:41 -------

IBM release some BIOS update for TP600X;
http://www-307.ibm.com/pc/support/site.wss/MIGR-4FYS2U.html
What relese do you use?
Current version is 1.11 which is for Windows XP support.

We can show Microsoft's document;
http://download.microsoft.com/download/5/7/7/577a5684-8a83-43ae-9272-ff260a9c20e2/Windows%20Native%20Processor%20Performance%20Control.doc
It define the interface for Windows XP.

The same document also said;
FADT PSTATE_CNT Value
To allow the operating system to assume control of performance state transitions
from the BIOS, provide the proper control value in the PSTATE_CNT field of the
Fixed ACPI Description Table (FADT) at byte offset 55.  As described in the
Intel BIOS WriterÂ’s Guide, this value should be set to 80h to disable the
SpeedStep Applet interface.

It is one of possibilities of this reported platform.


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