Comment by srazzaque

I had similar thoughts after purchasing my X13 AMD, not sure if you're experiencing the same thing I did. I was extremely disappointed with stock brightness when I first turned it on.

Turned out windows power saving and battery settings actually capped my brightness. So my user-controlled "100%" (via keyboard) actually becomes more like 60%, depending on the power profile.

As soon as I got a new m2 ssd, I shelved Windows and installed Fedora WS, which has no such issue. That is, if I say I want 100%, it obeys.

You can quickly test with either a live USB, or tweaking your power profiles.