[Bug 101691] [KBL] gfx corruption on windowed 3d-apps running on dGPU

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=101691

--- Comment #20 from Ethan Hsieh <ethan.hsieh@canonical.com> ---
amdgpu.dpm=0 doesn't really work.
There are some issues when loading amdgpu driver with dpm=0.
It leads to using Intel as OpenGL renderer (glxinfo) instead of AMD.
Error Message: Xorg.0.log:[ 24.261] (II) UnloadModule: "amdgpu"
I got two patches from AMD to fix the issue.
After applying patches, tearing issue is back.

Here are some new findings:
The issue can be reproudced on 5916&5917.
But, I only see the issue on 5916 when running glxgears with fullscreen.
When unplugging power adapter and running glxgear with default window size, the
issue on 5917 is gone.

Test Environment:
Device 1 (5916):
a. Graphics Cards: Intel [8086:5916] + AMD [1002:6900]
b. Kernel: 4.4.0-45
Device 2 (5917):
a. Graphics Cards: Intel [8086:5917] + AMD [1002:6900]
b. Kernel: 4.4.0-73

Test Result:
1. AC Mode: (Power Adapter)
Device 1 (5916):
$ DRI_PRIME=1 glxgear: PASS
$ DRI_PRIME=1 glxgear -fullscreen: tearing
Device 2 (5917):
$ DRI_PRIME=1 glxgear: tearing
$ DRI_PRIME=1 glxgear -fullscreen: tearing

2. DC Mode: (Battery)
Device 1 (5916):
$ DRI_PRIME=1 glxgear: PASS
$ DRI_PRIME=1 glxgear -fullscreen: tearing
Device 2 (5917):
$ DRI_PRIME=1 glxgear: PASS
$ DRI_PRIME=1 glxgear -fullscreen: tearing

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