After i managed to reboot (REISUB). I've look at dmesg log, and at the
end of the log theres an error for the last boot

24.340774] kernel: amdgpu 0000:04:00.0: AMD-Vi: Event logged
[IO_PAGE_FAULT domain=0x0000 address=0x4a68002a0 flags=0x0070].

So i added iommu=soft to the grub.cfg and reboot booted into
5.4.0.29-generic kernel 5 times so far and it seem to be boot fine now

** Attachment added: "dmesg"
   
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1876835/+attachment/5367316/+files/dmesg

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https://bugs.launchpad.net/bugs/1876835

Title:
  black screen before login on 5.4 kernel

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