With regards to the invisible LUKs prompt; my laptop does not run libreboot, but is still affected. Seems more like the Thinkpad framebuffer driver has a bug on the Linux or Grub side to me.
bug#66746: LUKS password prompt invisible, prompts twice
kasper . andersson--- via Bug reports for GNU Guix Sat, 28 Oct 2023 16:17:35 -0700
- bug#66746: LUKS passwor... Josselin Poiret via Bug reports for GNU Guix
- bug#66746: LUKS pa... Saku Laesvuori via Bug reports for GNU Guix
- bug#66746: LUKS pa... kasper . andersson--- via Bug reports for GNU Guix
- bug#66746: LUKS pa... kasper . andersson--- via Bug reports for GNU Guix
- bug#66746: LUKS pa... Jake
- bug#66746: LUKS pa... Tobias Geerinckx-Rice via Bug reports for GNU Guix
- bug#66746: LUK... Jake
- bug#66746: LUKS pa... Jake
- bug#66746: LUKS pa... James Smith via Bug reports for GNU Guix
- bug#66746: LUKS pa... X
- bug#66746: LUK... Jake