Comment 32 for bug 1791312

some more tests with different systems give the following table:

sorted by radeon-version
system kernel radeon result
------------------------- ----------- -------- --------
UBUNTU 14.04.5 LTS, Trusty Tahr 3.13.0-161 2.36.0 O.K.
puppy_tahr 6.0.5 3.14.56 2.37.0 O.K.
puppy_slacko 6.3.2 3.14.55 2.37.0 O.K
UBCD 3.16.0 2.39.0 FLICKER
puppy_xenialpup 7.5 4.4.95 2.43.0 FLICKER
UBUNTU 14.04.5 LTS, Trusty Tahr 4.4.0-133 2.43.0 FLICKER
UBUNTU 18.04.1 LTS (Bionic Beaver) 4.15.0-36 2.50.0 FLICKER

so the problem seems to start with a radeon.ko driver > 2.37.0;
I wonder how the radeon-version 2.38.0 would work, but, so far, I havn't
found a system including it.