Comment # 60 on bug 1028575 from Mircea Kitsune

I'm sorry for having taken so long to get back to this issue: I needed to be
sure that what I'm mentioning is correct, which at this point took months of
verification to be certain the issue is gone for good.

The problem has finally went away; It has not happened once during 3 months, in
which I was able to achieve well over a week of uptime! It disappeared after
I've preformed the following 3 changes on my system:

- Modifying my system GTK theme.
- Disabling KMix at startup.
- Uninstalling IBus.

I'm convinced the culprit here was IBus... more specifically its system tray
icon. That icon has caused odd glitches in the past, such as making random
menus pop up or crashing. It was likely also causing a graphical glitch that
introduced this infinite GPU loop. As such the ingredients you should need are:

- A GCN 1.0 RadeonSI AMD card, running on the "radeon" driver.
- A KDE (Plasma 5) Linux OS.
- The IBus input system, with the option to show the system tray icon.

If others can reproduce this, please comment on the issue and let us know! If
the problem does not return, I will mostly just be watching this bug from now
on; I don't plan on spending days to do more odd tests... especially after
receiving nearly no support from the FreeDesktop crew for almost an year,
despite giving them a ton of data and how major this issue was.