I have this same problem on one specific computer lately ... an HP P2-1334
which is an AMD-based system with an AMD Fusion E1-1200 processor and Radeon
HD 7310 onboard graphics. I boot it up, get the ecryption GUI password panel
but cannot enter anything So I have to ctrl+alt+del to restart it, see the
Grub menu appear and vanish and get to an ecryption black screen prompt
instead to enter the sd5 password.
The only other PC I've had this issue on was also an AMD-based system. I no
longer have it and forget the model but it had an Athlon XP processor and
some form of Radeon onboard graphics. Same exact procedure.
None of my other systems (all 7 of them being Intel-based) ever had this
issue.
