Boosts appreciated🙏

When changing the resolution on my iMac 5k late 2015 I am experience an artifact (horizontal lines).

This happens on all Linux distros including xorg and wayland.

I know that the system has one of those three GPU's inside:

"AMD Radeon R9 M380/M390/M395",

but neofetch/lspci reports:

"AMD ATI Firepro M6100"

and my settings:

"AMD Bonair"

I am using the "Radeon" driver.

I've been dealing with the issue very long and need help from some LinuxPros.

Can any one help?

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