Chromium GPU support on Manjaro

[maxjrh]

Can somebody shed some light on why GPU support works fine in ChromiumOS but not in Manjaro? Which (kernel?) patches, drivers, config, flags do make the difference here?

Binaries called "chrome" or "chromium" are explicitly blacklisted by the panfrost driver.

(Note that apart from Chromium, hw decoding works just fine for me in Manjaro using mpv for example.)   

I don't really believe that, especially the "just fine" part. I would really like to know which libraries you compiled and with which flags.
What does mpv say when you push Ctrl+h during a video?