Okay, it boots and clearly unlocks enough to get to GRUB.
Then, the default option, OpenSUSE 16.0, fails with the kernel panic, presumably because the drives aren't unlocked enough.
If I go into advanced, that first entry also fails. The second (Recovery Console) boots, asks for a password to unlock, I can press Ctrl-D to make it boot normally, then I get to my desktop normally. So....
How do I make it do that automagically?