I tested the flickering-issue with the upstream-kernel "linux-image-unsigned-4.19.0-041900rc3-generic_4.19.0-041900rc3.201809120832_amd64.deb" and it seemed to be fixed! No more flickering. So I added the tag "kernel-fixed-upstream" to this report.
** Tags added: kernel-fixed-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1791312 Title: ubuntu 18.04 flickering screen with Radeon X1600 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1791312/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs