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My laptop Fn lock is a software and boot thing.
It can only be changed using a pre-2024 version of Lenovo Vantage, and is not accessible anywhere else.
Caps lock + Fn, or Fn pressed multiple times, does nothing.
But, if the laptop is booted into Linux, and the battery dies, the Fn lock switches.
You can imagine how much fun that can be.
Perfectly valid question, I've been caught out not doing the simple stuff before!
It does (the "Repair Windows" option which comes up as ones of the first things to try), but it makes no difference. I've checked the log and all checks completed successfully.
I have now made it worse by messing around with the bcdboot command.
So now I'm just going to reinstall via USB and hope I don't lose any files 🤞🏼