[Bug 2091864] Re: Cannot enter luks password at boot after kernel 6.8.0-50 upgrade

I had the same problem on a recently installed Kubuntu 24.04 system on HP ProBook 450 G1 (Haswell i5, with integrated graphics). Kernel is 6.8.0-71.
Cold boot was working fine, but on *reboot* I got a black screen at the LUKS password prompt, so not seeing the HP and Kubuntu boot logos. Please note that, if I typed the password blindly, the boot process was then proceeding successfully, and the system in the end was starting. However, it was quite annoying not to see anything.

Adding i915 to /etc/initramfs-tools/modules and running "update-
initramfs -u" fixed he problem for me too.

It was not easy to find this bug report though, since searching for
"reboot problems" was leading to a lot of other "black screen on boot"
problems, unrelated to this one, including an (already fixed) sddm
problem for Kubuntu.

Never had this problem with Kubuntu 20.04 or on 16.04 and 14.04 bases.

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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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