How to Disable Advanced Power Management for PC Card Modems

ID: Q199209

The information in this article applies to:
IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SUMMARY

This article describes how to disable Advanced Power Management (APM) for PC card modems.


MORE INFORMATION

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).
Under some circumstances, such as when you use an Integrated Services Digital Network (ISDN) PC card modem, it may be necessary for a PC card modem to remain in a power-on state when APM is enabled.

To disable APM for PC card modems, change the EnablePowerManagement DWORD value from 01 00 00 00 to 00 00 00 00 in the following registry key:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\VCOMM
This issue has been reported on an IBM ThinkPad 365 computer. To resolve this issue, make sure the EnablePowerManagement DWORD value is set to 01 00 00 00.

Additional query words: pcmcia 


Keywords          : win98 winapm 
Version           : WINDOWS:
Platform          : WINDOWS 
Issue type        : kbinfo

Last Reviewed: June 16, 1999