Screen flicker with multiple screen set-up

[ffallateuf at gmail.com]

I've been experiencing a screen flicker on one of my monitors when running
a setup of three external monitors after exiting the "Screen Energy Saving"
mode from no activity.

The following is what I am running:

   - Kubuntu 16.04
   - KDE Plasma 5.6.5
   - KDE Frameworks 5.23.0
   - Qt Version 5.5.1
   - Kernel: 4.4.0-31
   - Dell Latitude E7450
   - Intel HD 4000 Integrated graphics chipset
   - Three external monitors:
      - 2 x DVI
      - 1 x VGA

I've tried:

   - Switching amongst all three compositors (OpenGL 3.1, OpenGL 2.0,
   XRender)
   - Upgraded kernel to 4.6.x
   - export KWIN_TRIPLE_BUFFER=1

Has anyone else encountered this and any suggestions on how to fix this ?

- F.0.
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