I've experienced a similar issue on boot, with a Ryzen 7 3800x and a 5700xt on GNOME 3.36.2.
It may be related to a new error message when booting:
amdgpu: [powerplay] failed to send message: NumOfDisplays (64) $param:0x00000003 response
But, contrarily, my flickering issue can be corrected by readjusting the resolution from 1440p to 1080 and back again.
I've experienced a similar issue on boot, with a Ryzen 7 3800x and a 5700xt on GNOME 3.36.2.
It may be related to a new error message when booting:
amdgpu: [powerplay] failed to send message: NumOfDisplays (64) $param:0x00000003 response
But, contrarily, my flickering issue can be corrected by readjusting the resolution from 1440p to 1080 and back again.