With DRM drivers, Plymouth going black means it is changing from the
SimpleDRM driver (BIOS graphics) to the accelerated driver (which can
take 10 seconds or more to load in the background). Something similar
might happen with nvidia-drm. To test that theory you could add this
kernel parameter:

  nvidia-drm.modeset=0

Although it will likely disable Wayland support, if that matters.

Another possible workaround might be to get the boot graphics on screen
even earlier using this kernel parameter:

  plymouth.use-simpledrm

I would also try tapping the Escape key, which should usually toggle you
between the text and graphical password entry screens. Doing so might be
a workaround for keyboard focus problems.

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https://bugs.launchpad.net/bugs/2092209

Title:
  Can't enter passphrase for encrypted disk on splash screen

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