TPM lockout when the battery is drained in a Windows 8-based Tablet PC

Applies to: Windows 8Windows 8 EnterpriseWindows 8 Pro


Consider the following scenario:
  • You have a Tablet PC that is running Windows 8.
  • You drain the tablet battery completely.
  • You connect the tablet to the charger.
In this scenario, the tablet may try to turn on and turn off on its own multiple times. This can cause Trusted Platform Module (TPM) anti-hammering logic to lock the TPM. Additionally, the tablet goes into Bitlocker lockout state, and after you enter the recovery key, the Bitlocker drive cannot be unlocked.


This issue occurs because after you drain the battery, you connect the tablet to the charger, and then the tablet automatically powers on and begins to startup. When the operating system starts, it determines that the battery is too low to run and shuts down. The tablet continues to cycle in this manner until it hits the Trusted Platform Module (TPM) lockout. This leads to Bitlocker recovery mode. 


After you apply this hotfix, you have to clear the TPM for the update to be in effect.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must be running Windows 8.

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates