Selecting the last Grub entry with 6.18.9-200 gives me a black screen that never makes it to the LUKS password entry (I run full disk encryption).
If I edit the entry and insert nomodeset then it works like normal. The older Grub entries work.
Anyone else have this? This is with an Nvidia 4090.
This sounds like it may be the result of incomplete build of the nvidia drivers (possibly an early reboot after an update?) which then results in the driver not loading properly. The nomodeset forces only basic graphics instead of the full function of the GPU.
One possible way to fix it would be to run sudo akmods --rebuild --force --kernels 6.18.9-200.fc43.x86_64 then reboot after that completes.
As long as I add nomodeset, that gets me to the LUKS decrypt screen, and after that everything boots just fine. So the driver should be fine, no?
Anyway, I’ll try your tip and report back!
Funnily enough, the update that triggered this bug was done the Fedora way, with the reboot to install.
edit:
marius@fedora ~ > uname -r
6.18.9-200.fc43.x86_64
marius@fedora ~ > sudo akmods --rebuild --force --kernels 6.18.9-200.fc43.x86_64
[sudo] password for marius:
Checking kmods exist for 6.18.9-200.fc43.x86_64 [ OK ]
Building and installing nvidia-kmod [ OK ]
Now for the reboot
It didn’t work, still need nomodeset to get to decryption passphrase screen.
Worth mentioning, that it also doesn’t work to try enter the passphrase blindly.
Some have encountered similar and for them the fix seemed to be removal of rhgb from the kernel command line. You can try editing the command line from the boot menu and remove that option (which only affects the current boot).
If it works properly then it can be permanently removed with sudo grubby --update-kernel=ALL --remove-args='rhgb'. The change with grubby will manage all future updates as well.
That sort of fixes it! I lose the pretty graphical “enter your passphrase” type of screen 
But at least I get to the prompt and can boot.
Is rhgb something new? I’ve been running Fedora for some months now without any issue. Is it Fedora’s version of Plymouth or something?
rhgb is not new and has been in the default fedora kernel command line for a long time. Some newer updates apparently have introduced conflicts between certain hardware and the functions of the rhgb option with plymoth graphical boot.
Not everyone encounters this issue, but certain hardware may.