this post was submitted on 08 Jun 2024
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See what happens after actually running:
systemctl hibernateSystems don't normally enter hibernate automatically unless they are at low battery. There is something called modern standby or s0 sleep, versus traditional s3 sleep. The "third state" you describe sounds very much like s3 sleep. I doubt it would switch between s0 and s3 sleep though, normally one or the other is enabled. Maybe it's going to hybrid suspend? In fact that would probably explain it. I believe hybrid suspend involves using s3 sleep state.
Also there are no power relays in modern ATX PSUs to my knowledge, you are describing something else. They use transistors to do all of the switching I believe, aside from the physical switch on the back which also isn't a power relay.
Excellent, that makes sense. I’ll try that command tonight at home, see what it does, and report back. I kind of want to know what it’s doing just because I’m curious.
I say a relay, but I agree with you - I couldn’t imagine a relay being used. But whatever it is on my desktop, it sounds just like a traditional ice cube relay clicking - and it’s quite loud. But I have no idea what it is. I’m not sure I’ve ever had a computer that made that noise before. My laptop makes no such noise obviously.
Could be the transformer, or the inductors. Those can move when in use and they can also make sounds like coil wine.