Microsoft KB Archive/245563

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PRB: Windows 98 May Fail to Wake from PCI Device Behind Bridge

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Q245563

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The information in this article applies to:


 * Microsoft Windows 98 Driver Development Kit (DDK)

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SYMPTOMS
Windows 98 may fail to wake from a peripheral component interconnect (PCI) device when the device is behind a PCI-to-PCI bridge. Common PCI devices that support wake include modems (wake on Ring) and network cards (wake on LAN).

The User can determine if the PCI device in question is behind a PCI-to-PCI bridge by using the View devices by connection option in Device Manager. Some chipsets, such as the Intel 810, place all PCI slots behind a PCI-to-PCI bridge.

CAUSE
If the PCI-to-PCI bridge does not support PCI power management, Microsoft Windows will not enable PCI devices behind the bridge to wake the system. To support wake, PCI devices (including PCI-to-PCI bridges) must adhere to the PCI Bus Power Management Interface Specification.

RESOLUTION
You may be able to get around this problem by moving the PCI device so that it is not behind the bridge. Again, Device Manager can be used to help determine whether a PCI device is behind a bridge.

STATUS
This behavior is by design.

MORE INFORMATION
The third-party products discussed in this article are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.