Just reproduced on 6.11.0-19.

Some additional details:
- Both with `splash` and without, at first the screen is bright and the input 
is registered just fine
- Also in both cases, after a couple of seconds the screen becomes momentarily 
black, and the old content is now displayed dimmed

Now, the behavior or `splash` is different from no-`splash`.
Apart from keyboard input in the text field not being registered at all, the 
layout indicator that was previously showing "US" now shows nothing. But 
Ctrl+Alt+Del still works.
When there's no `splash`, the input is possible but after the black screen 
flash the input starts at an earlier position, mangling the prompt a bit.

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https://bugs.launchpad.net/bugs/2091864

Title:
  Cannot enter luks password at boot after kernel 6.8.0-50 upgrade

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Upgraded Ubuntu 24.04 software, including kernel 6.8.0-50, after which
  upon booting the luks password couldn't be entered (dialog
  unresponsive). Was able to boot 6.8.0-49. Could boot 6.8.0-50 with
  quiet splash commented out - with text input.

  Added i915 (my video driver) to /etc/initramfs-tools/modules and
  updated initrd, after which could boot 6.8.0-50.

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