xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x7a cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 1 name:SUMO @ pci:0000:00:01.0
Provider 1: id: 0x45 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 0 associated providers: 1 name:TURKS @ pci:0000:01:00.0

glxinfo | grep "OpenGL renderer"
OpenGL renderer string: AMD SUMO (DRM 2.49.0 / 4.9.65-1-lts, LLVM 5.0.0)

xrandr --setprovideroffloadsink 1 0

DRI_PRIME=1 glxinfo | grep "OpenGL renderer"
OpenGL renderer string: AMD TURKS (DRM 2.49.0 / 4.9.65-1-lts, LLVM 5.0.0)

glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
305 frames in 5.0 seconds = 60.887 FPS
300 frames in 5.0 seconds = 59.888 FPS
300 frames in 5.0 seconds = 59.889 FPS

DRI_PRIME=1 glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
303 frames in 5.0 seconds = 60.477 FPS
300 frames in 5.0 seconds = 59.875 FPS
300 frames in 5.0 seconds = 59.895 FPS

DRI_PRIME=1 vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
8159 frames in 5.0 seconds = 1631.689 FPS
10330 frames in 5.0 seconds = 2065.845 FPS
8791 frames in 5.0 seconds = 1757.947 FPS

DRI_PRIME=1 steam
DRI_PRIME=1 steam steam://rungameid/570 - непосредственно саму игру
DRI_PRIME=1 %command% - прописывал в настройках запуска игры