[Bug 206231] R9 280X low performance with all games

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206231

--- Comment #39 from Jacques Belosoukinski (kentosama at whiteninjastudio.com) ---
I did different tests and there is a real bug.

With Dirt Rally in ultra, if I use 8mxsaa, I have miserable performance. If I
set 0mxsaa in game, the performance is + ~60 fps. If I reactivate the 8mxsaa,
the performances are very good between ~50 and ~70 fps. This is not normal.

With the game Dawn of War II, the framerate is ~48 fps in ultra, high, normal,
low.

It is really very strange.

I noticed that the performances are good after a big lag. This was the case
with Dirt Rally, on a race, the game freeze for a few seconds then suddenly,
the game run with than ~ 60fps.

In the game Dead or Alive 5 (Proton), the performances were from ~ 40 to ~
50fps. After a lag, the game worked very well at 60fps contant.

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