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IBM ThinkPad Laptop CPI Fan Does Not Turn on After Computer Switches from Passive Mode to Active Mode
Article ID: 271717 - View products that this article applies to.
This article was previously published under Q271717
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).
This problem can occur if Windows does not properly start the fan or fans even though the computer is in Active mode.
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:
260910WARNING: 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:
(http://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
q271717_w2k_sp2_x86_en.exe /zThe 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
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.
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:
(http://support.microsoft.com/kb/249149/EN-US/ )Installing Microsoft Windows 2000 and Windows 2000 Hotfixes