Сабж. Патрик уже обновил ядро в Slackware-current и пересобрал ncurses (он обходил поломку временной модификацией ncurses).
Вот исторические записи из Changelog'а:
Thu Nov 8 02:52:55 UTC 2018
...
l/ncurses-6.1_20181027-x86_64-2.txz: Rebuilt.
Temporarily removed the bce feature from the linux console definition until
the console is fixed. Added a linux-bce terminal definition for testing.
Wed Nov 14 00:00:07 UTC 2018
a/kernel-generic-4.19.2-x86_64-1.txz: Upgraded.
a/kernel-huge-4.19.2-x86_64-1.txz: Upgraded.
a/kernel-modules-4.19.2-x86_64-1.txz: Upgraded.
...
d/kernel-headers-4.19.2-x86-1.txz: Upgraded.
k/kernel-source-4.19.2-noarch-1.txz: Upgraded.
...
l/ncurses-6.1_20181110-x86_64-1.txz: Upgraded.
The new kernel fixes the artifact on the virtual console, so the original
linux terminal definition has been restored.