Linux on zenbook duo

I’m considering buying a used laptop. The “Asus ZenBook Duo UX481FL-BM042T” to be precise. I want to run Linux on it (probably Arch Linux), but I’m hesitant because I’m not sure how good the Linux support will be.

Does anyone have experience with this laptop or similar one’s? I’ve read that the brightness of the secondary display can’t be adjusted. Is this true? Are there other issues?