We did some more troubleshooting of AMD Radeon issues on ppc64
As with Nouveau, it looks like a change from 64k to 4k page size got it
working again with RX 5700. I suspect it will be similar for RX 6800 if
we can get some of them, they are a good complement for the compute power.
The issue is page size, not ppc64
This sounds like a kernel driver bug that needs to be bisected and reported upstream, do
you have a link to the bug report(s)?