Same problem on fresh install of encrypted lvm root with lvm swap of ubuntu 
15.10 with amd graphics using open source amd. Work around seems to be revise 
/etc/default/grub to:
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="quiet splash"
followed by "sudo update-grub2" and "sudo update-initramfs -u" and "sudo 
grub-install /dev/sda"

This causes /boot/grub/grub.cfg to change the linux line to end in quiet
splash

linux   /vmlinuz-4.2.0-22-generic.efi.signed root=/dev/mapper/vg-root ro
quiet splash

I wonder if the normal line ending of $vt_handoff may be the problem. I
don't know what causes $vt_handoff to appear or even how to permanently
remove it.

hth

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https://bugs.launchpad.net/bugs/1386005

Title:
  Password not accepted graphical boot for encrypted root system

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