Ryzen 5 2400G Stuttering since 2018-03-07

[Dawson Dias]

Hello

I'm experiencing extreme stuttering in X on my Ryzen 2400G. This stuttering
can be noticed even while only moving the mouse.
Said stuttering does not exist under Wayland.

This constant stuttering started on 2018-03-07 with the patches that were
pushed on that day. Stuttering occurs on both branches drm-next-4.17
(f6c3b601bd490eda08c27b03607448abd4b4841b) and drm-next-4.17-wip
(6896a66bc6d0fcb69b6be564fa43f02c09348b72).

dmesg.log <https://bpaste.net/raw/06e6dcc4545b>
journalctl.log <https://bpaste.net/raw/f6f3dc8d108d>

What sort of information do we require to pinpoint the source of this
regression and fix it?

-Dawson Dias
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