Currently it is not possible to authenticate at Symantec Drive Encryption's Pre-Boot authentication screen, called Bootguard, using the Lenovo virtual keyboard. There is a formal request to add virtual keyboard support at Bootguard for the Lenovo Thinkpad Helix Windows 8 Tablet.
Attached keyboards are still fully supported on these systems and only virtual keyboards are not currently supported for this hardware.
Symantec Corporation is committed to product quality and satisfied customers. This Feature Request is currently being considered by Symantec Corporation to be addressed in a forthcoming version of the product.
Technical Support filed a Feature Request to add this product feature. Note that an feature request is exactly that, a request. There is no committed date for this request from the Endpoint Encryption Product Management team, nor from the Endpoint Encryption Engineering team at this time.
Please be sure to refer back to this document periodically as any changes to the status of the request will be reflected here.
For more information on Symantec Encryption Desktop and a complete list of all Virtual Keyboard Support requests, please see the following article: