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Laptop 'power' lights convey a couple of different states with a single light. Besides the typical on/off, there's also the 'sleep' fadeup/fadedown sequence.

One could also add a few blinking states. Slow blink = charge, fast blink = problem, two quick blinks = alert, etc.

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I find it incredibly annoying that laptop lights blink when they're on standby - I often put my laptop on standby when I sleep and then I have a light either blinking or "waxing/waning" in my face (I like to sleep in complete darkness). My improvised solution is to throw an item of clothing over the laptop now.

Black gaffer's tape is great for almost all the annoying "hey, I'm here!" LEDs in the office. The blue ones are especially gruesome.

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