My discrete VGA is now fast using 4.10 rc2 kernel (Fedora 25)

I'm using Fedora 25 and Wayland without problem. But my discrete VGA is very slow. My laptop have hybrid graphics , internal is Intel HD 5500 and discrete is AMD R7 M260

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)

05:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445]


By upgrading kernel to rawhide kernel (4.10.0-0.rc2.git3.2.fc26.x86_64) my discrete VGA run fast now:
dnf config-manager --add-repo=http://dl.fedoraproject.org/pub/alt/rawhide-kernel-nodebug/fedora-rawhide-kernel-nodebug.repo 

dnf update


I'm using Dota2 to benchmark, Resolution: Full HD 1920x1080 , Video Setting preset: #2 from left: Fastest O--X--O--O Best Looking

To run application using discrete VGA from terminal:
DRI_PRIME=1 steam

Or just right click on launcher and choose Launch using Dedicated Graphics Card


Previously only 8 fps but now it can render as high as 42 fps 😮😃

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