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System becomes unresponsive on a Lenovo Helix Tablet at preboot after enabling USB 3.0 Mode (Emulation) in the UEFI Firmware
Technical Articles ID:   KB78632
Last Modified:  11/7/2017
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Environment

McAfee Drive Encryption (DE) 7.1
McAfee Endpoint Encryption for PC (EEPC) 7.0 Patch 1 (7.0.1) and later
Lenovo Helix Tablet UEFI BIOS version 1.14
Microsoft Windows 8 Professional

For details of DE 7.1.x supported environments, see KB79422.
For details of EEPC 7.0.x supported environments, see KB76804.

Problem

After successfully installing DE/EEPC, encrypting the hard disk on the Lenovo Helix Tablet, and restarting, the system becomes unresponsive after displaying the Lenovo logo splash screen.

The DE/EEPC preboot login screen is never displayed.

The issue is reported with this model on Microsoft Windows 8 (64-bit) operating systems, but it may also occur on 32-bit systems.

Cause

An DE/EEPC conflicts with the UEFI Firmware when USB 3.0 Mode (Emulation) is set to Enabled or Auto.

Solution

Lenovo and McAfee have determined that the following updates need to be installed:

Workaround

Access the BIOS and set USB 3.0 Mode (Emulation) to Disabled.

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