this post was submitted on 10 Sep 2024
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Privacy
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Windows by default doesn't fully power off when you tell it to shut down. It goes into hibernation and keeps the network open for updates and will sometimes power back on to complete these updates.
If you want to fully power off, hold the left shift key when you click shut down. Or turn the power off elsewhere (eg. psu or power bar.) I'm sure there's another way to do it, or to prevent the behavior entirely.
This isn't correct at all. You are confusing fast boot and sleep. When Windows goes to sleep (I think it is S4) is when it can come back up for updates. However, during sleep networking is not active. It just wakes back up on a timer. Fast boot isn't sleep at all. It just a fancy shutdown mode that doesn't unmount the boot disk before shutdown. It also caches the system state to improve the startup time.
Fast boot is just Windows logging you out of your session, then hibernating.
Sleep is keeping the computer in a low-power state with RAM powered on..
Both of these have been known to result in laptops powering on unbeknownst to their owners to perform updates and remain powered on afterward.
Windows is never responsible for this. It is errors in the EC code or BIOS wake timers. When you click shutdown, the system is powered off. Windows hands off execution to Bios code for shutdown after the cycling dots saying "shutdown".