A/Q1: What do you mean exactly? It's switched on fine and I can switch between LCD/EVF with the DISP. button. Does the EVF turn off when you press that button once or twice (the LCD should turn on now)?
A2: You probably have, it's in the Canon menu, second tab from the right, a few entries down 'Power Saving...'. When you're in the CHDK menu, you're in ALT mode, which means that the camera won't be notified about any keystrokes. No key will wake up the camera (except for mode dial, of course... possibly also raising/closing the flash) until you exit ALT mode with the ALT key and press another one. As stated in the Canon user manual, you can also turn the camera into vertical position and it will wake up again.
Q3: What's up with 'S5IS 1.01c'? Is it really that version and if so, why does the 1.01b version work on it? Also, this might be the cause of Q1, though I can't remember hooking any code which controls LCD brightness/state in the final build.
