Microsoft KB Archive/285882

= Windows Me Hangs When You Try to Enter Standby Mode with Multiple MS-DOS Prompt Sessions Running =

Article ID: 285882

Article Last Modified on 10/18/2005

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APPLIES TO


 * Microsoft Windows Millennium Edition

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This article was previously published under Q285882



SYMPTOMS
If both of the following conditions exist, Windows Millennium Edition (Me) may stop responding (hang) when you try to enter Standby mode:
 * More than one MS-DOS Prompt session is running.
 * Your computer has more than one hard disk.



CAUSE
This problem can occur because Windows Me locks all volumes on hard disks before a computer enters Standby mode. For drives that do not contain the swap file, volume locking occurs relatively early in the standby process. Locking a volume causes the Virtual Machine Manager (VMM) critical section to be entered.

As required by the PCI Power Management specification, the PCI bus driver delays execution of the current thread for 10 milliseconds during the suspend process if it transitions a PCI device from the D0 power state to the D3 power state.

Resuming a thread after this delay requires the use of a VMM restricted event. Restricted events cannot be processed if the VMM critical section is currently owned by a thread other than the one that is currently running, and the current thread is not part of the System Virtual Machine (VM). If all threads go idle during the delay, only the two most-recently created VMs are scheduled by the VMM scheduler. If more than one MS-DOS Prompt sessions is running, only DOS Virtual Machines (VM) are scheduled instead of the System VM, and this prevents the restricted event from executing.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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

  Date        Time     Version    Size    File name -  02/05/2001  08:22am  4.90.3003  70,539  Pci.vxd



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



MORE INFORMATION
For additional information about Windows Me hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

295413 General Information About Windows Millennium Edition Hotfixes

Additional query words: msdos

Keywords: kbhotfixserver kbqfe kbbug kbenv kbfix kbhardware kbpowerman kbqfe KB285882

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