Configuring TPM to run in between Windows 8 -- Thinkpad General

[#1]

Symptoms

Consider the following scenario where you try to install Windows 8 in a dual boot setting with Windows 7(With TPM enabled) .You may encounter with the follwing error message in the event log.

Title: BitLocker Drive Encryption

Headline: BitLocker could not be enabled.

Message: The BitLocker encryption key cannot be obtained from the Trusted Platform Module (TPM). C: was not encrypted.

In the System event log, you may see  the following events logged for this problem from BitLocker-Driver:

Event ID 24636: Bootmgr failed to obtain the BitLocker volume master key from the TPM.

Event ID 24641: An unexpected error was encountered attempting to retrieve the BitLocker volume master key during restart.

Event ID 24609: A key was not available from required sources during restart.

Diagnosis

Thinkpad X220's running Preloaded Windows 7 with TPM enabled 

Solution

If you encounter the above said scenario,the BIOS update should fix the issue.

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/8duj13us.exe
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/8duj13us.txt
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/8duj13uc.iso
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/8duj13uc.txt