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Laptops usually have a dedicated key to turn off the screen, no?
You mean the external display toggle? Because otherwise, no.
Mine doesn’t, but even if it would have, most of the original special keys don’t work in Linux. It’s quite annoying because I don’t have F keys and Home-PageUp and such, they were accessible with key combinations with the original OS.
On most laptops that do that, there’s a BIOS setting that fixes it, the F keys at least. On HP’s, you can set whether you want the top row to act as F keys or “media” keys. Any combo that uses the Fn key should work in Linux, and you can set your own hot-keys/shortcuts in Linux as well.