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Thinkpad-X1-Xtreme-gen-2-adjust-screen-brightness-not-working - English Community - LENOVO COMMUNITY
I can't reduce my laptop's screen brightness. The buttons just aren't working. How can I solve this problem? - Quora
Screen goes black when the brightness is adjusted to the lowest level - ideapad 720s-14IKB - Lenovo Support BG
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Fn keys for volume and brightness don't work on Lenovo Thinkpad e460 running Ubuntu 18.04 - Ask Ubuntu
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