4.16 and older kernels work great with the hardware, no performance
drops or glitching/freezing
kernels 4.17 , 4.18 , 4.19 and 4.20 is not working with the hardware,
causing heavy performance drops and system unstability,
commit responsible is:
https://github.com/torvalds/linux/commit/320b164a
I just bisected the kernel and i have found the commit that caused the bug:
https://github.com/torvalds/linux/commit/320b164abb32db876866a4ff8c2cb710524ac6ea
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kernels newer than 4.16 has this "amd-gpu ac adapter" bug, which makes
the computer useless if ac adapter is plugged in , 4.19 and newer
doesn't boot or as i tested 4.19-rc4 boots but makes computer unusable
I have filled a bug report in bugzilla here:
https://bugzilla.kernel.org/show_bug.cgi?