I have this issue with Xubuntu 16.04 using nvidia-370 drivers, on a GTX 980 ti. 
I have made the following changes to /etc/default/grub for nosplash and text 
mode but still have a blank/black screen:
GRUB_CMDLINE_LINUX_DEFAULT="nosplash"
GRUB_GFXPAYLOAD_LINUX=text

Unfortunately I have four encrypted volumes, so I have to type each
password, wait a few seconds, then type the next. There is no indication
whether I typed any of the four correctly or incorrectly. I know
something went wrong when the system does not correctly boot up after
going through each of the four passwords.

I have tried using plymouth which also does not work, I see the default
blue password prompt but typing a password does nothing (CTRL+ALT+F7
will show whatever was typed).

I have also tried using the same password on all four volumes and using
the patch here:
https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1022815 but
that also doesn't work

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https://bugs.launchpad.net/bugs/1359689

Title:
  cryptsetup password prompt not shown

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