Using Hybrid Boot (Legacy/UEFI) instead of just UEFI seems to have
"worked around" the problem. Also saw somewhere else to disable PPT.
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https://bugs.launchpad.net/bugs/1863434
Title:
Another Lenovo ThinkPad T440s here. Can confirm I'm experiencing this
issue as well with Ubuntu 20.04. Tried turning off "quiet" and "splash"
and all I would get is a blank screen. I also tried turning off
GRUB_TIMEOUT_STYLE, but still a blank screen. This device is dual-booted
with Windows 10.
