I can't adjust the brightness. Brightness setting is nowhere to be found!!

[bluebluebell]

Suddenly my device went dark when booting up. I tried various ways to change the screen brightness that I can found on the internet (like this one https://www.tenforums.com/tutorials/44213-adjust-screen-brightness-windows-10-a.html), but the brightness settings are nowhere to be found.My device is just one PC, no external monitor.IdeaPad L340

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