Solution:
https://bugzilla.redhat.com/show_bug.cgi?id=1960937#c12
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It turns out the problem is with the radeon driver.
The GDM can be started normally once amdgpu is used instead of radeon
$ cat /proc/cmdline
BOOT_IMAGE=(hd0,gpt3)/ostree/fedora-b84e4d88fe04fad4bc33b6ea17b973b4c73cd56c60843527323ed31290b71b6c/vmlinuz-5.11.20-300.fc34.x86_64
root=UUID=6d7c04a4-9
The screen is hang on a text mode, all black with only the cursor blinking at
the upper left corner.
Ctrl+Alt+F3 switching works, and sway can be started without issues.
Yesterday still worked normally, but after some update, it shows this problem.
Silverblue Rawhide.20210511.n.2 is working (do