After encrypting a disk on a Microsoft Surface Pro 2 system running Microsoft Windows 8/8.1 booting in UEFI mode, the Touch Cover or Type Cover keyboard becomes inactive upon reboot or after hibernation.
Similar issues were observed on the Surface Pro 1 and have been fixed using Symantec Drive Encryption 10.3.2 and above. Surface Pro 2 systems still have this known issue and is currently being reviewed by Symantec Development to be fixed in a future release.
Connect the keyboard properly with Surface Pro before you turn on your system and before you perform the following procedures:
To activate the Touch Cover or Type Cover keyboard at reboot
To activate the Touch Cover or Type Cover keyboard after Windows hibernation