XPS 15 9550 - TPM "disappeared".

After receiving my XPS 15 9550 about six weeks ago, I immediately enabled BitLocker w/TPM. Which was working fine until a week or so; I was invited all of a sudden for the recovery BL key after having the laptop off for about 24 hours.

Consecutive restarts kept asking the recovery key. Finally, I tried suspending protection BL. Trying to take it back, I got the error message "no security of the TPM secure mechanism were found on this computer". And of course: TPM has been put as a device "hidden" in Device Manager, try to re - activate it led to the same error message. Also, I was unable to find any mention of TPM in the BIOS.

No hardware changes or upgrades to the BIOS didn't had been played when this problem occurred.

I tried earlier to upgrade the BIOS version 1.2.0 to 1.2.2 (later), but without success - the TPM is still missing from the BIOS. I also tried to restore the settings to factory, but with the same result.

Finally, I got a hold of a Dell technician who was able to understand my problem. I was told to make a laptop computer power cycle: remove the battery, remove the memory sticks and finally press the power button for a good 30 seconds. Then wait 30 seconds before put you everything back together.

In other words, only a full reset CMOS. But it worked! After starting the TPM module, options were "Safe" in the BIOS.

I still wanted to know what caused this in the first place however.

Tags: Dell Laptop

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