Comment 9 for bug 1863044

Oh, sadly -89 doesn't work either; ok.

Yup, bisecting to find the specific issue/commit would be nice, to get a better pointer.

On the quick path front, if you still have the time for another test, could you please try the 5.4 kernel on Focal?

It should install/boot fine on Bionic, done that myself recently -- something along the lines of:

$ echo 'deb http://archive.ubuntu.com/ubuntu focal main restricted' | sudo tee /etc/apt/sources.list.d/focal.list
$ sudo apt update
$ sudo apt install linux-{image,modules}-5.4.0-9-generic # check that only the kernel packages are installed / come from Focal.
$ sudo rm /etc/apt/sources.list.d/focal.list

cheers,
Mauricio