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:
Public bug reported:
The 5.11-series 20.04 HWE kernels are not usable on my laptop. They boot
up to graphical login. Then the screen goes black for a second every few
seconds. When i try to log in the machine seems to hang and the desktop
never appears...
The kern.log shows a lot of these errors:
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