KDE Neon is my prefered KDE based distro.
The image is running a 5.4 kernel and the amdgpu is not correctly managed, so I needed to boot in safe graphics mode.
After installation I downloaded the latest stable kernel (5.8.8-050808-generic) from here with the following files
and installed the packages:
sudo dpkg -i *.deb
My laptop has a bug related to Fn keys not working without go to sleep mode (related to a BIOS problem see here https://www.virtualconfusion.net/thinkpad-e15-g2-and-linux/).
But current setup prevent my laptop to come out from sleep mode.
I needed to remove the nomodeset from the kernel options. This is not part of the default grub file in KDE Neon.
The nomodeset is added via the file /etc/default/grub.d/neon-installation-nomodeset.cfg
whether I remove the file or remove the nomodeset options.
I just simply renamed the file:
sudo mv /etc/default/grub.d/neon-installation-nomodeset.cfg /etc/default/grub.d/neon-installation-nomodeset.cfg.old
Then update the grub configuration:
After reboot I am able to put my computer in sleep mode and get out of it and the Fn keys are working