Fedora 22 & KDE 5: plasmoids flicker

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Dear Community,

i have an odd problem with my plasmoids, all of them are flickering randomly. The Compositor is set to OpenGL 3.1+EGL. According to lspci my graphics adapter is an intel sandybridge integrated adapter

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 6630M/6650M/6750M/7670M/7690M]

i have also a radeon adapter in my notebook, but i think the system uses only the intel adapter. glxinfo | grep -i opengl tells me

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile 
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.5.4
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 10.5.4
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 10.5.4
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:

It's quite annoying. can i do anything about it?

Thanks in advance, Lukas