NVIDIA 340xx problem with kernel 5.6.6

[t_pol]

Hi list members.

After having worked fine for a number of kernel upgrades from 
5.4 to 5.5 ... , the nvidia-340xx module was not automatically 
rebuild by kmod during the kernel upgrade to 5.6.6 leaving
the system stuck during the boot process.

Right now I've uninstalled kernel 5.6.6 and
excluded kernel* in /etc/dnf/dnf.conf.

I'm using Fedora 31 on an HP pavilion dv5 laptop

The nvidia driver has been installed following
this: https://rpmfusion.org/Howto/NVIDIA

Can someone kindly help me ?

Thanks in advance

Angelo