https://bugs.freedesktop.org/show_bug.cgi?id=91202
--- Comment #11 from EoD EoD@xmw.de --- (In reply to Vedran Miletić from comment #9)
EoD did testing on Sapphire R9 380X Nitro, details at https://gist.github.com/EoD/2baa78b81e233218a59c and copied below:
This has been tested on drm-next-4.5 geafbbd9 and drm-next-4.5-wip gbc48ef9, although only the trivial cases.