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[SOLVED] E6430 - Display brightness constantly switches to zero


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I've been trying High Sierra on my laptop with the same bootpack as I use for Sierra. Everything seems to work except for the touchpad. But there is a very strange problem.

Upon booting the system turns brightness to zero. The only way to see anything is to press Fn+F3 and then Fn+Up. I don't know why, but that's how it works. And after that it switches to zero by itself every 20 seconds. 

I've already seen the same issue on Sierra few times, but I fixed it with reboot. This time reboot doesn't help. I tried my backup Sierra to make sure it's not a hardware problem. I also checked the power saving setting.


Have you guys encountered something like that? How do I even diagnose it?

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