Article ID: 279491 - Last Review: February 20, 2007 - Revision: 5.2 Multiple CardBus Devices Cannot Share IRQsThis article was previously published under Q279491 IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base: 256986
(http://support.microsoft.com/kb/256986/EN-US/
)
Description of the Microsoft Windows Registry SYMPTOMS
A registry key was added in Windows 2000 Service Pack 1 (SP1) to change IRQ-routing settings for 16-bit CardBus controllers, and this registry key affects all CardBus controllers in a computer. Because some types of hardware may include multiple CardBus controllers, problems may occur if the multiple CardBus controllers try to share the same IRQ.
RESOLUTIONTo 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
(http://support.microsoft.com/kb/260910/EN-US/
)
How to Obtain the Latest Windows 2000 Service Pack
The English version of this fix should have the following file attributes or later:
Date Time Version Size File name Platform ------------------------------------------------------------------ 5/28/2001 09:24p - 34,756 Ntdetect.com Intel 5/29/2001 09:28a 5.0.2195.3649 58,992 Pci.sys Intel 5/29/2001 09:28a 5.0.2195.3649 109,136 Pcmcia.sys Intel NOTE: To view the file version, right-click the file in Windows Explorer, click Properties, and then click the Version tab. STATUSMicrosoft 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 3. MORE INFORMATIONFor additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below
to view the article in the Microsoft Knowledge Base:
265173
(http://support.microsoft.com/kb/265173/EN-US/
)
The Datacenter Program and Windows 2000 Datacenter Server Product
For additional information about how to install multiple hotfixes with only one reboot, click the article number below
to view the article in the Microsoft Knowledge Base:
296861
(http://support.microsoft.com/kb/296861/EN-US/
)
Use QChain.exe to Install Multiple Hotfixes with One Reboot
This hotfix allows the use of multiple CardBus controllers in a single computer by sharing IRQs.
This hotfix allows the use of multiple CardBus controllers in a single computer by sharing IRQs. To use the hotfix with Windows 2000 SP3, you must change the registry to allow IRQ Routing. By default, IRQ routing is turned off in Windows 2000 SP3 to avoid any issues on computers that do not require this hotfix. To allow IRQ routing, follow these steps. WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
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