REISUB is broken
Now, I'm not sure if this is in all installs of Intrepid or just some of them, but somehow the magic SysRq keys stopped working on several installs of Intrepd Ibex. I don't know what causes it, but it becomes very apparent thanks to Compiz Fusion somehow locking up the entire operating system.
A test of REISUB on this system when it is working shows none of it works (In fact, I got flooded by gnome-screenshot, indicating pretty clearly the magic keys are somehow disabled.)
I need bug confirmation, which means that if this problem has shown up in other systems, it's likely a bug and not some problem I caused.