Looks like the same bug. We should probably merge, but into what package
(linux, plymouth, or xorg)?:
Bug#897958: plymouth: long delay before splashscreen with kernel 4.16
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897958
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897572
Ben Hutchings suggests that this is probably caused by the new RNG
behaviour in 4.16, and I concur. See Ben's remarks in #897572
<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897572>.
Kind regards,
--
Ben Caradoc-Davies <b...@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand