[Bug 98897] Macbook pro 11,5 screen flicker when AC adapter plugged in

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98897

--- Comment #6 from Tom B <tom at r.je> ---
dmesg and xorg attached. 

Yes, this has dual GPUs, an onboard intel on the i7 4870HQ and a Radeon M370X.

lspci | grep VGA output:

00:02.0 VGA compatible controller: Intel Corporation Crystal Well Integrated
Graphics Controller (rev 08)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Venus
XT [Radeon HD 8870M / R9 M270X/M370X] (rev 83)


glxinfo | grep OpenGL output:

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD CAPE VERDE (DRM 2.46.0 /
4.8.10-1-ARCH, LLVM 3.9.0)
OpenGL core profile version string: 4.3 (Core Profile) Mesa 13.0.1
OpenGL core profile shading language version string: 4.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 13.0.1
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.1 Mesa 13.0.1
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10
OpenGL ES profile extensions:


The Radeon card is in use. I can switch to the intel card using the gpu-switch
utility ( https://aur.archlinux.org/packages/gpu-switch/ ) but the external
ports HDMI and DP are connected to the radeon card, and I need to use external
monitors frequently. When the intel gpu is used, there is no flicker issue.

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