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Screen brightness non-functional on legion 5 (kbin.earth)

submitted 1 day ago by unknown1234_5@kbin.earth to c/linuxquestions@lemmy.zip

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I got a legion 5 gaming laptop back in like 2020 and while the laptop itself works fine, about a year or two in the screen brightness just... stopped funtioning. I was still on windows at the time, but the issue is still here now and I'd really like to be able to use Plasma's new hdr-without-hdr thing. As far as I can tell, there is nothing wrong with the hardware in my computer.

that being said, I've run windows (which it came with), ubuntu, tuxedo os, and fedora (current) on this laptop and aside from the brightness sometimes briefly coming back after a restart until I restart again (I think it happens after updates when it happens but it's so rare I can't tell), it won't come back. I'm using lvfs for firmware stuff and do get stuff from it sometimes, and I keep my system up to date. I haven't been able to find any solutions online so I figured my best bet would be to ask here. anyone know how to fix or at least diagnose it?

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[–] Jumuta@sh.itjust.works 1 points 8 hours ago

have a read through this page: https://wiki.archlinux.org/title/Backlight

it's pretty extensive and should work on most distros. I think on laptops brightness is usually handled through ACPI so you should probably have a look at that part closely