After update to Tumbleweed snapshot 20180530 (I probably missed snapshot
20180528 which actually updated the kernel from 4.16.11-1-default to
4.16.12.1-default), the boot hangs on "loading initial ramdisk"

Potential root cause: kernel 4.16.12-default

System:
- Acer laptop
- 2 x Intel Celeron N3050 @ 1.6GHz

It is a standard tumbleweed installation, just packman repositories are added.

Booting works with previous kernel 4.16.11.1-default (out of Grub Boot Menu:
Advanced options for openSUSE Tumbleweed -> openSUSE Tumbleweed, with Linux
4.16.11-1-default).

According to bug #1054425, 
- I removed "quiet" and "splash=silent" boot options,
- I also added plymouth.enable=0 option.

All together, and as single changes. However, nothing did help.

Happy to help.

Best regards
Sebastian