Unresponsive Trackpad and Keyboard while using BitLocker Encryption on Win10 BootCamp Partition - 12 Second Delay

Goal:

Encryption of Windows 10 Enterprise Bootcamp Partition on Early 2015 13-inch MacBook Pro Retina (Running Sierra) - Wiping macOS from HD (so that Windows is the only OS) would be ok - but didn't seem to resolve the issue.

Problem:

BitLocker Encryption is successful (after disabling TPM Requirement in Group Policy) but leads to rough user experience.

Primary Symptoms:

Built-in Trackpad and Keyboard become virtually unusable on light blue BitLocker Password/Decryption Screen. There is a 12 second window of time where it is unresponsive followed by a ~1 second window where I'm able to enter characters into the password field, this is then followed by another 12 second window... and so the story goes.

Other Symptoms:

If I have a USB Drive with an LED plugged in it starts flashing during the 1 second window.
If I hold option to try to boot from a different partition or external drive it takes a very long time for them to appear and when the screen finally comes up the same 12 second delay occurs

Video of Symptoms:

https://youtu.be/2lRclze_YEw

Any ideas what might be going on here?

Thinking it could have to do with the MBR (Master Boot Record)

Thanks! (Additional Details below)

Things I have tried, but that did not work:

Using a USB Key - Improved user experience as Keyboard input isn't required, but slow startup persists - best option so far
Having File Vault both Enabled and Disabled
Enabling File Vault Before and After Enabling BitLocker
Using the new and legacy Windows BitLocker encryption methods.
Plugging in a USB Keyboard and Mouse - Seems to resolve the unresponsiveness, but isn't a reasonable solution when on the road.
Wiping macOS and installing Windows only.

Other notes:

After removing the BitLocker Encryption - part of the issue persists - keyboard and mouse are responsive but startup is slower - perhaps by 12 seconds
I have had the delayed (by 12 seconds) Keyboard and Mouse issue on the Mac side when BitLocker was enabled and booted into macOS
Issue exists on both El Cap and Sierra

MacBook Pro with Retina display, macOS Sierra (10.12.1), Early 2015

Posted on Nov 30, 2016 10:50 AM

33 replies

Loner T

Level 9

59,536 points

Dec 25, 2016 8:38 AM in response to Laki10

For reference the update is https://support.microsoft.com/en-us/help/4004227/windows-10-update-kb3206632 .

Laki10

Level 1

4 points

Dec 27, 2016 9:54 AM in response to Laki10

Very strange. I had full keyboard and mouse functionality back for a full work session, re-started my computer a dozen times or so with full shutdown and restarts, and everything seemed fine, hence the above comment. I disabled Windows updates entirely just to make sure the issue doesn't come back, and put my computer to sleep after I was done working. Fast forward 12 hours, and the same problem is back. no keyboard or mouse on startup, and only getting them back every 1/20 reboot attempts. So apparently KB3206632 was not the real culprit. Back to square one. 😟

funk0ff

Level 1

0 points

Dec 29, 2016 2:25 PM in response to Laki10

Thank you for all the troubleshooting you've been doing Laki10! I'm experiencing the same. I believe this is not 100% Windows related though. Why do I say this? After trying to reset NVRAM/PRAM and SMC, the macbook pro booted me back to MAC OS. So I restarted, hit the Option button waiting for MBP to ask me to choose between operating systems. This took forever, once the choices came up though while pressing the arrow keys in the MBP itself, I experienced the same delay as you would in the Bitlocker screen. I plugged in a USB keyboard, and was breezing through the options, pressing right and left arrows, tried with MBP's built-in keyboard, delayed... I don't know if this is due to installing Windows 10 via Bootcamp. Anyway, my 2 cents, hope it is helpful.

Edited for clarification.

Edit#2 see this post for similar issue:

Slow preboot sequence on late 2013 rMBP13

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Unresponsive Trackpad and Keyboard while using BitLocker Encryption on Win10 BootCamp Partition - 12 Second Delay