I am running slackware 14.2 64 bit multilib with nvidia 440.44 series drivers with no problems,
but when i run on slackware-current (linux-5.4.16 with the same drivers) i get a 2 minute
pause on boot then the boot up process continues no problem. When i run 4.19.* lts series kernel
no pause occurs and nomodeset is not necessary to prevent the graphics from being unusable.
there is a thread on this at linuxquestions: