A friend, with a benefit.

• Ductape, if it's loose and should be stuck
• WD-40, if it's stuck and should be loose
• Match, if it 's dark and should be lit
• Hammer, if it's lit and should be dark.

why not a tape, black, for electrical things

gaff tape

Who are you, who are so wise in the ways of science?

Author wish he was born in 1880 and is not going to give up! (context https://en.wikipedia.org/wiki/Photophone )

PS: thanks for the links, between this PIXHELL, GAIROSCOPE, or SATAn clearly air-gap is just a concept. Fascinating to go through his work basically using everything potential to go through. Great overview in https://arxiv.org/html/2409.04190v1

Orient it so the LED is facing away from you, with the LED facing a surface covered with Vantablack or some such equivalent. This saves on tape etc...

You know those rubber feet things you can get that you put on furniture legs? I love those. Block out the LED lights on the air conditioning in the bedroom, computers, etc.

I think black nail polish can work too, if you know any BTGGs.

There’s nothing which duct tape can’t fix.

Yeah, a light blocking friend.

Try brightnessctl. If it does not recognize it, go with some tape I guess.

What's that? Not the geological epoch, right? As long as it doesn't conduct electricity and blocks light i guess.

Right, in my field it's gaffer tape but the same principle applies.

We call it Jesus tape.

Why does that sound like the radioactive dragon thingie for that netflix show about league of legends?

This is the only correct answer.

If it moves and it's not supposed to: duct tape.
If it doesn't move and is supposed to: wd40

The real answer is to open it up and solder in a wire that shorts out the LED.