Read the statement by Michael Teeuw here.
Adjusting monitor brigthtness level via software
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@KirAsh4 My problem isn’t the brightness of the text but the brightness of its background (i.e. the screen) as this can be seen at night when there’s very little light inside the room the mirror is in.
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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.
