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.
That means you're testing it with the versions of kernel / modules / boot
loader / etc as you did when you set it up, without any updates.
Good idea!
I just did that on the latest Devuan Beowulf Live distro (kernel
4.19.0-14), and... no flickering!
Kinda a relief, if you ask me...
Now, where to start to look for the software defect?
Bernard (Beer) Rosset
https://rosset.net/
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