Logs won't show anything wrong, if you use ethernet, the
-b switch in the journalctl call means only output since last reboot
Though what I find everywhere is that the card you list in the first post is not supported in linux, so I do not understand how it ever worked.
To test changes in the kernel only, you can revert back to linux 5.0.9 if that is still in your cache and you have no modules depending on linux, check with
pacman -Qi linux, look for the
required by line. If you don't use nvidia or virtualbox, you can
sudo pacman -U /var/cache/pacman/pkg/linux-5.0.9-1-x86_64.pkg.tar.xz