The HP EliteBook 8540w is not on the fprint supported website: http://www.freedesktop.org/wiki/Software/fprint/libfprint/Supported%20devices
and the close Validity VFS101 id=138a:0001 is unsupported: http://www.freedesktop.org/wiki/Software/fprint/libfprint/Unsupported%20devices
This issue resides with the libfprint package.
The HP EliteBook 8540w is not on the fprint supported website: www.freedesktop .org/wiki/ Software/ fprint/ libfprint/ Supported% 20devices
http://
and the close Validity VFS101 id=138a:0001 is unsupported: www.freedesktop .org/wiki/ Software/ fprint/ libfprint/ Unsupported% 20devices
http://
This issue resides with the libfprint package.