[Bug 94708] Open source radeon drivers not working properly with Radeon HD 8550M

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=94708

--- Comment #12 from Arthur Hrast Essenfelder <arthur.essenfelder@gmail.com> ---
I am also facing a similar issue.
I also get very low performance when using the DIS Card and the radeon driver
in comparison with the IGD Intel card.

# vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
ATTENTION: default value of option vblank_mode overridden by environment.
35719 frames in 5.0 seconds = 7143.730 FPS
35715 frames in 5.0 seconds = 7142.853 FPS
34593 frames in 5.0 seconds = 6910.545 FPS

# DRI_PRIME=1 vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
8298 frames in 5.0 seconds = 1659.484 FPS
8313 frames in 5.0 seconds = 1662.389 FPS
8315 frames in 5.0 seconds = 1662.897 FPS

I posted this issue a few days ago on ask.fedoraproject.org but so far no luck:
https://ask.fedoraproject.org/en/question/87235/low-performance-when-using-the-dis-card/

In any case, I think this is the best place to seek help.
Here are more details on my system:

Distributor ID:    Fedora
Description:    Fedora release 23 (Twenty Three)

# lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Whistler [Radeon HD 6730M/6770M/7690M XT]

# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Pwr:0000:01:00.0

# glxinfo | grep "OpenGL renderer"
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile

# DRI_PRIME=1 glxinfo | grep "OpenGL renderer"
OpenGL renderer string: Gallium 0.4 on AMD TURKS (DRM 2.43.0, LLVM 3.7.0)

# Xorg -version
X.Org X Server 1.18.3

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