Black screen on restart after update: fix "nomodeset"

[Fred Jupiter]

Kubuntu 22.04
Updated to Kernel 5.15.0-107-generic on 6 June 2024 (I think)
Notebook HP 17-ca1010ng
AMD Ryzen 5 3500U
AMD Radeon Vega 8 (IGP)

Expected:
After updating via Muon (incl. the kernel, see above, I think), the computer should restart normally.

Actual:
After the HP logo, the computer displays a black screen, backlit. Nothing happens, completely unresponsive.

Workaround:
Temporary:
Add "nomodeset" before "quiet splash" via editing of GRUB menu.

See: https://askubuntu.com/questions/162075/my-computer-boots-to-a-black-screen-what-options-do-i-have-to-fix-it

Permanent:
Edit /etc/default/grub: the line "GRUB_CMDLINE_LINUX_DEFAULT=". Add the word "nomodeset" before "quiet splash".
- Run "sudo update-grub"

[Fred Jupiter (fredjupiter)]

oh yes, the key to press for the GRUB menu after booting with a modern (U)EFI bios is: ESC, not Shift (as mentioned in the link above).

[rfc (rfc0)]

The "black screen after reboot" symptom is equivalent to the symptom from https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2068738

But, the linux kernel version mentioned in this bug report is Kernel: 5.15.0-107-generic, not 5.15.0-112.

It is possible that the kernel version in this bug report was mistaken, or it could be a different issue causing the same symptom.

There is a similar report mentioning 5.15.0-107 here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2068735

[Mario Limonciello (superm1)]

AFAIK It's a bad backport to 5.15 stable. If it's what I think, here's the fix (IIRC).

https://<email address hidden>/

Try applying that to your 5.15 kernel.

[Fred Jupiter (fredjupiter)]

Yes, the broken kernel probably actually is Kernel 5.15.0-112-generic.

I help people over the phone, or very quickly, and then I don't have access to the machines any more.

I was able to have a quick look just now: Kernel 5.15.0-112-generic is the most current. I assume this kernel is causing the trouble.

Sorry about the wrong information.