Read the statement by Michael Teeuw here.
Adjusting monitor brigthtness level via software
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I get that, mine does the same at night. Even turning off the output, the back light is still on. Turning off the HDMI would do the trick, except after a few seconds I get that ugly, bright blue, ‘NO SIGNAL’ box. Annoying, but at least it goes away after a while and the screen’s back light will shut off. AFAIK there is no way for the rpi to control screen brightness, at least none that I could find.
For those electrically inclined, one possible hardware solution is to tap into the brightness control within the monitor, and tie that to the rpi with a light sensor. It’s easier for those who buy their controllers off of eBay as those things are exposed and easy to get to, but on a sealed (box purchase) monitor, you’d have to tear it apart and probe for the signals that control the back light.
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@KirAsh4 That would indeed be a great solution. Will ask one of my friends to have a look into that, maybe he can tap into the brightness settings this way.
As I don’t have my mirror put together at this stage (It’s just a screen attached to a Pi), have you tried lowering the brightness at night so that only the text is visible but not the screen? So what I’m asking is: is controlling the screen brightness the key to hiding the screen at night or does the text become illegible if we do that?
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I have not.
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@KirAsh4 Well, if you ever feel like experimenting, let me know :)
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Not any time soon. I’m coping with a family loss at the moment and haven’t touched anything in 3 weeks.
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@KirAsh4 Sorry to hear that. All the best for you.
