Microsoft KB Archive/328538

= BUG: 1394 Host Controller Power Management Capabilities Are Incorrectly Reported =

Article ID: 328538

Article Last Modified on 7/22/2004

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APPLIES TO


 * Microsoft Windows XP Driver Development Kit

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This article was previously published under Q328538



SYMPTOMS
In Windows XP, you can set one of the 1394 host controller's Power Management options to Allow this device to bring the computer out of standby. However, if you select this check box, the system can be put in an unreliable state if a 1394 power setting capable node tries to bring the computer out of standby.



CAUSE
Under Windows XP, 1394 Wait/Wake capability is not fully supported by the 1394 host controller drivers OHCI1394.SYS and 1394BUS.SYS. The 1394 host controller's Power Management option to Allow this device to bring the computer out of standby was incorrectly made visible to users.



RESOLUTION
To prevent the system going into an unreliable state, clear the Allow this device to bring the computer out of standby check box. With this option cleared, even if a 1394 power setting capable node is connected to the bus and tries to bring the system out of standby, the 1394 host controller ignores the request.



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

Keywords: kbbug kbnofix KB328538

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