On my laptop (an old toshiba satellite A300) kernel 4.18 can’t boot. only fallback mode boots. LTS kernel runs well.
Reading somes forum I learned that one of the difference beetween normal mode and fallback is the use of hook autodetect. Somes remove it in /etc/mkinitcpio.conf
I read other solution in Arch forum :
disabling ipv6 autoload in /etc/modprobe.d/modprobe.conf :
# disable autoload of ipv6 alias net-pf-10 off
It seems to solve problem with kernels 4.18. Perhaps these kernels need to be updated ?
If it can help someone…