https://bugs.freedesktop.org/show_bug.cgi?id=96868
--- Comment #32 from Markus-Germann@web.de --- I wanted to add a comment, because I'm also affected with a slightly different setup then most of the users that posted here. I have a Radeon R9 390, use an up-to-date Arch Linux (Kernel 4.13.3-1-ARCH with xf86-video-amdgpu 1.4.0) but with only a 60Hz screen with therefore a 4K/HiDPI screen (resolution 3840x2160). I also have lots of flickering and artefacts. The problem is solved setting the power level to high, but as it raises the temps from 50/51 to more then 60°C with the electricity consumption and cooler going up it's not an option for me. In low it flickers even more then in auto.
Using the manual setting however (that Andy Furniss mentioned in comment 15 from 2017-05-11 13:01:39 UTC) the problem is solved, the flickerin/tearing and artifacting gone and the temperature seems to stay like before. (Thanks a lot for that, Andy!)
Is it possible to make use of that solution to release it upstream?
Thanks for all the work and effort, by the way!