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XPS15 brightness issue

Hey, I just got my XPS 15 last week. I have an issue with brightness, I think its a driver issue or sensor something.

I use maximum performance / on power or balaced on battery. I love the 4K display is very bright.

Yet, sometimes it reduces brightness while I work. Could be a combination of keys, i didnt figure that yet.

After that, it wont let me enhance brightness at all. It looks as 80% and it wont go higher. After a while I found a  solution - to disable HD Graphics 4600, and to enable again from Device Manager.

But, this is time consuming and annoying... Please help. I want to keep brightness higher.

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