Here's a little background before venturing into a discussion. For your info, older ThinkPads (older than T431s) are able to be powered up by using fingerprint reader.
Recently, I read an article that newer ThinkPads (after T431s) fitted with the fingerprint readers will not be able to authenticate to power on the machine. I really like this function and frequently use this in previous generations of the ThinkPads.
Can anyone confirm this as it seems strange to me that Lenovo would remove this function.
With the upcoming generation of ThinkPads (T440, X240, etc), the fingerprint cannot be used to turn the PC on. You can still use the fingerprint to replace BIOS/HDD passwords, but you cannot use it to turn the PC on as with previous ThinkPads.
The reason for this is that (AuthenTec) has been our long time partner has decided not sell PC fingerprint readers anymore. Hence, their parts have reached its end of life cycle.
The new supplier (Validity) does not currently have this feature though.There's no possibility this feature will be added later by software upgrade. It is hardware feature that T440s does not have and never will have.