Please test latest mainline kernel without "amdgpu.dc=0":
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8-rc4/
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1882442
Title:
Upgrade from 18.04 to 20.04 deactivates internal monitor in display
manager
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