Can't control Lenovo laptop screen brightness

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Brightness control and 165hz monitor not working on Lenovo Legion 5 Pro

Hi! I’m currently on Manjaro KDE and it’s working well on my device except the two things I mentioned in the title, brightness control and the 165hz display. I’ve looked through all the proposed solutions on this forum as well as other forums but nothing seems to help. The brightness control key itself is working but neither that or the brightness slider in the Battery and Brightness menu are actually changing the brightness, so it’s just locked on 100%. The laptop has a 165hz display which r…