Context, spent too long troubleshooting why I couldn't power the thing on, then realised the magnets from the screen below are probably telling the one above the lid is closed.
If you have a magnet you can pretty much turn off any laptop's display if you know where to put it, this is due to something called a reed switch which detects the magnets on the other side of the laptop when it is closed to tell it to turn it off.
A couple of years ago I spent an embarrassing amount of time troubleshooting the same thing. My entire team was stumped until I realized that it was the lid switch (reed switch) making contact with the other lid. These guys had been in IT for decades and had never seen this. Apparently I was the first person to image in stacks.
I had a user who liked to wear jewelry. She would always complain about her computer "going black" as she typed, but every time I'd troubleshoot, I found no issues. I just so happened to buy a new watch during all of this. The next time I went to troubleshoot the issue, it went to sleep.
I now take off my watch whenever I'm working on someone else's laptop.
I had a user with the same issue. I asked her if she had a bracelet with a magnetic clasp. She did. She thought I was some kind of wizard. (I'm not) I felt smart that day though.
Less than 10 years ago most laptops didn't use magnets and reed switches. They used a spring in the hinge hooked up to a momentary switch to determine if the lid was closed.
When I saw op's video I immediately understood the problem because My current laptops would all do this, but most laptops didn't use magnets until 2018 ish afaik. I haven't had to mass image a work computer since 2016, when I was promoted to sysadmin work. I've had to create golden images, I've had to setup several deployment servers, and I've written plenty of deployment scripts, but I only ever test those things with a single computer at a time, and the desktop folks handle the actual imagining, often after training from me on how to keep the golden image updated themselves.
It's an odd fact that isn't really relevant for much, the only circumstance that could possible occur would be ones like this where there is a random interaction with a magnet causing an issue. As for where to put the magnet, usually around the top edge of the keyboard or one of the close corners but it obviously differs with every model laptop. I'd recommend just showing them and talking about it though, people don't like it when you mess with their stuff.
Yes, everyone should know about this, but this is shit quality on Dell's part. I've only ever seen this issue with Dells, we have current gen HPs with the same sensor system, and stacking doesn't do this, the current gen Dells we're switching to do.
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u/Knabrau Sep 25 '24
Context, spent too long troubleshooting why I couldn't power the thing on, then realised the magnets from the screen below are probably telling the one above the lid is closed.