Ubuntu 18.04->18.10 upgrade, blank screen on/before login

[Richard Baka]

I had been using ubuntu 18.04 with mainline 4.18.* kernel without any problem then I've upgraded to 18.10 and the screen is black now on login. I'm almost sure there shouldn't be modesetting problem on 4.18 with its default modules.
What information, files, logs do you need to solve this problem? This is an AMD Ryzen based notebook with hybrid graphics.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1798800

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Joseph Salisbury (jsalisbury)]

Does the bug go away if you select the prior kernel from the GRUB menu?

[Richard Baka (bakarichard91)]

Joseph Salisbury (jsalisbury) no it doesn't. I've tried it of course. 18.04 worked well with the same kernel. I've tried to reconfigure xorg, reinstall amdgpu, remove mesa but there is no change. Maybe I try to make a fresh install

[Richard Baka (bakarichard91)]

Fresh install has solved the problem.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]