Ultra 9 285H on Lenovo thinkbook 14 with Ubuntu can't adjust brightness

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Ultra 9 285H on Lenovo thinkbook 14 with Ubuntu can't adjust brightness

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hello,

I'm here to ask for help.My device just won't change the brightness. I have check out for various way to fix it but nothing works. I have tried to install now driver for GPU, but nothing happened(although I didn't really find a suitable driver for Ubuntu 22.04 LTS)

I'm now using Ultra 9 285H. I have asked the helper from Lenovo, and they told me that I have to find a suitable driver for Ubuntu in Intel.

also, my sound output won't work either, could anyone give me a solution?

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