Microsoft KB Archive/271717

= IBM ThinkPad Laptop CPI Fan Does Not Turn on After Computer Switches from Passive Mode to Active Mode =

Article ID: 271717

Article Last Modified on 2/20/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q271717



SYMPTOMS
When your IBM ThinkPad laptop computer is using battery power (Passive mode) and the temperature of the computer is sufficiently high to trip one of the _ACx trip points, fans that are defined in the _ALx may not be turned on. This behavior is designed to conserve battery power. However, the fan may stay off even after you plug your computer into an AC power supply (Active mode).



CAUSE
This problem can occur if Windows does not properly start the fan or fans even though the computer is in Active mode.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

WARNING: When you restart your computer after you apply this hotfix, your computer may stop responding (hang). To prevent this problem, run the hotfix with the /z switch, and then shut down the computer normally. For example, the command would appear like this:

q271717_w2k_sp2_x86_en.exe /z

The English version of this fix should have the following file attributes or later:

  Date        Time    Version        Size       File name --  08/18/00    4:17PM  5.0.2195.2103  1,678,464  Ntkrnlmp.exe 08/18/00   4:18PM  5.0.2195.2103  1,678,464  Ntkrnlpa.exe 08/18/00   4:17PM  5.0.2195.2103  1,699,008  Ntkrpamp.exe 08/18/00   4:18PM  5.0.2195.2103  1,656,384  Ntoskrnl.exe



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 2.



MORE INFORMATION
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Keywords: kbhotfixserver kbqfe kbbug kbenv kbfix kbhardware KB271717

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