I have "always off" for the hold switch setting, and my clock backlight (5G video) stays on also, except when I flip hold on it goes out. You could use this as a workaround in the meantime, and also maybe there's a clue in there to help you. I don't know the code at all but I figured anything would help.

EDIT:
Scratch that. There's a setting in the clock under "General Settings" for Backlight. The options are "Off", "RB", and "On" and ON is the default.
No fixing necessary.