After updating, GDM opens and closes and won’t let me login

After I had done an absolutely massive update, my Fedora installation has finally kicked the bucket. I’m typing this on my phone, but I took a video of the issue. I did a bunch of web searching, but w/o any concrete error, I can’t find the root cause. Most likely a graphics driver update must’ve done it in. Weird, because it had absolutely no issues on Wayland and it’s AMD. Sucks though, as I was really enjoying this distro.

  • I installed a Brother printer driver via a janky Bash script. I know, I know

  • I installed some Microsoft fonts on the same day

  • Video

Did the upgrade include a new kernel version? If so, is the problem any better if you select the previous kernel version from the GRUB menu?

  • I checked ‘sudo dnf update | less’ and there is a bunch of kernel packages.
  • I tried 6.14.4 but it didn’t work but GRUB was also flickering like crazy

GRUB flickering sounds weird - since no part of Fedora has started at that point.

It could be:

  1. The update changed something in the GRUB config file
  2. A coincidental hardware issue

Do you have a live USB you can boot from? That should be completely independent of anything your upgrade did, so can rule in or out hardware issues.

Yeah, let me find it.

Yeah, Ubuntu 24.04.2 LTS works fine.

Thanks, interesting.

So if the flickering (a) does happen in Fedora’s GRUB, (b) does happen in GDM, (c) does not happen in live Ubuntu on the same hardware…

then I wonder if the upgrade somehow changed GRUB_GFXMODE and/or GRUB_GFXPAYLOAD_LINUX in the GRUB config.

But I don’t have a lot of experience working with those, others may well have a better idea.

GRUB flickers for a bit and then is fine. When rebooting from Ubuntu it didn’t flicker at all. I tried to launch the Gnome shell from the tty and it core dumped. There was also something about IBus aborting. I’m worried that the update carpet bombed my entire installation. I wonder if there is some sort of system repair tool that can replace system files.

I would also add that I have two other GRUBs working on the system, that of Ventoy and the Ubuntu live CD.

GDM isn’t flickering but just closing and opening. (You can’t really see it in the video, but GDM shows the fancy animation everytime.) I followed this guide I managed to get to the tty again. Then following the solution to this issue on the Unix & Linux Stack Exchange, I entered sudo systemctl start gdm and managed to get as far as a gray screen w/ the top bar in Gnome. But then that was just too much for my system and it crashed. Interacting w/ anything other than the login selector in the center of the screen in GDM crashes it as well. One of the first times it crashed it spat out some error about general protection fault. I’m thinking a graphics driver update cooked Gnome, still weird considering AMD is supposed to not cause issues.