I would boot from an installation USB / CD (preferably the one you set
the
machine up from) and go into Rescue Mode, and see whether the hardware
still
continues behaving the same way.
I just did that on the latest Devuan Beowulf Live distro (kernel
4.19.0-14), and... no flickering!
Booting back on the internal disk... No flickering.
I just don't get it. Would it be hardware/cable-related in the end?
*sighs*
Bernard (Beer) Rosset
https://rosset.net/
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