I'm now using a workaround. I added "module_blacklist=amdgpu" to the kernel command line in /etc/default/grub. The kernel 5.11-series now runs fine, albeit without hybrid amd graphics.
I have put the relevant bit of kern.log when amdgpu is not blacklisted in the attachment. ** Attachment added: "Relevant bit of kern.log when amdgpu is not blacklisted" https://bugs.launchpad.net/ubuntu/+source/linux-meta-hwe-5.11/+bug/1943001/+attachment/5546075/+files/excerpt_kern.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1943001 Title: hwe 20.04 kernel 5.11 series hang at graphical login leaving laptop unusable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-meta-hwe-5.11/+bug/1943001/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
