Until I can figure out a way to get rid of the flicker, I will be keeping my LEDs off all the time.
Flickr? That would drive me nuts. I usually leave them on at medium but I think I have the sleep timer set to 4 hours on my board.
it looks like it's about 60-75 Hz, which might be past the flicker threshold for most people. Tho duty cycle also appears pretty wide for most brightnesses, so I'm sure many wouldn't even notice.
I have to run my CRTs at 80-85 Hz or more, and have serious issues with most flat displays due to my high flicker sensitivity.
I'm going to try the "other" official firmware and see if that fixes it.
The keyboard in question uses blank black cherry POM keycaps from a DAS II, with white LEDs for a nice subtle backlinght bath. I keep cherry profile white imsto POM on some of the keys (capslock, numlock) to more easily tell what mode I'm in. It looks really nice when it's on, so if not for flicker, I'd keep the backlight on all the time, even at night.