Disable: 'Enable use of BitLocker authentication requiring preboot keyboard input on slates' This policy setting allows users to enable authentication options that require user input from the pre-boot environment even if the platform indicates lack of pre-boot input capability. The Windows on-screen touch keyboard (such as used by slates) is not available in the pre-boot environment where BitLocker requires additional information such as a PIN or Password. It is recommended that administrators enable this policy only for devices that are verified to have an alternative means of pre-boot input (such as by attaching a USB keyboard). Note that if this option is not enabled, options in the "Require additional authentication at startup" policy may not be available on such devices. These options include: - Configure TPM startup PIN: Required/Allowed - Configure TPM startup key and PIN: Required/Allowed - Configure use of passwords for operating system drives. Counter Measure: Enable this policy setting for computers that support alternative means of pre-boot input. Potential Impact: Users will be required to authenticate in order to boot computers that rely primarily on touch keyboards, if they do not have access to a USB keyboard or other alternative means to enter their PIN or password they will be unable to boot the system.

[enable/disable]

(1) GPO: Computer ConfigurationAdministrative TemplatesWindows ComponentsBitLocker Drive EncryptionOperating System DrivesEnable use of BitLocker authentication requiring preboot keyboard input on slates (2) REG: HKEY_LOCAL_MACHINESoftwarePoliciesMicrosoftFVEOSEnablePrebootInputProtectorsOnSlates