Some minor issue I've noticed: After installing Manjaro KDE from the WebFAI on my MIB Pro 15 (thanks again for the help!) and upgrading kernel to 5.7 (same with 5.8), when shutdown or reboot, I get the following error message:
ERROR: resume: no device specified for hibernation
It also drives CPUs for a few minutes crazy (or, at least, fans are blowing full power), so I needed to do a hard reset with the power button.
After downgrading to 5.4, the error and the fan "orgy" are gone, I can shutdown and reboot again.
It seems to be specific to this notebook, because I newer had this behavior on my other older Lenovo notebooks with Manjaro and kernel 5.7 and 5.8.
As I said, downgrading helped, so I'm not blocked, no rush here.
Let me know, if you need more data or if I can help somehow.