Here's a discussion thread on the dolphin forums:

https://forums.dolphin-emu.org/Thread-everything-is-the-wrong-color-on-linux-with-open-source-amd-drivers?pid=340104#pid340104

And the change in dolphin which probably caused the behaviour to change:
https://github.com/dolphin-emu/dolphin/commit/a9a8c730748b8c8a2e83feb4c38626361cf9daa1