OK, about the bisect:
c2fb3094669a3205f16a32f4119d0afe40b1a1fd is the first bad commit
Date: Sun Apr 20 13:24:32 2014 +0200
drm/radeon: improve PLL limit handling in post div calculation
This improves the PLL parameters when we work at
the limits of the allowed ranges.
I reverted this commit (I got some good working tips from Chris
Bainbridge), tested the result with the kernels 4.4.0-rc1 and 4.6.0-rc6+
and the problem is completely gone. I ended up with a good stable and
rock-solid display output without artefacts.
I could test against some other kernels if any of the devs here would
like me to do that.
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https://bugs.launchpad.net/bugs/1479136
Title:
[ubuntu 14.04.2] Artefacts in radeon driver on kernel 3.16 and upwards
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