I'm also seeing this on linux-image-6.8.0-50-generic package for Ubuntu
24.04, if I downgrade to linux-image-6.8.0-49-generic its fine.

The LUKS prompt shows up and the keyboard works for a split second, then
the display blinks off for a moment (like its changing video modes), and
when it comes back I can't finish typing my LUKS password in anymore.

Intel video drivers on a Dell Latitude 7410

One odd thing I noticed is that when the prompt first comes up,
underneath it is a keyboard icon and the word "US" next to it,
presumably showing my keyboard input language. After the display blinks
the keyboard icon remains but the text next to it vanishes.


Edit: I want to add that if I disable the LUKS boot prompt, the system is able 
to boot normally and the keyboard works fine at the end of the boot process. 
Not really a solution, but it confirms the keyboard works in general on the new 
kernel. Its just the LUKS prompt during boot that is wonky.

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https://bugs.launchpad.net/bugs/1621367

Title:
  4.4.0-36: keyboard dead at boot & full disk encryption prompt for
  password

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