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In kernel 6.4.8.arch1-1, the CONFIG_SYSFB_SIMPLEFB option was set to "y" (it was unset in previous kernels). A side effect of this change seems to be that the integrated AMD GPU in my laptop is now named /dev/dri/card1 rather than /dev/dri/card0 as it was previously. (Now /dev/dri/card0 does not exist.)
Was the change intended? For a system with a single GPU, it was nice for it to be reliably named /dev/dri/card0 (for example, systemd units could use Requires/After=dev-dri-card0.device to prevent being started too soon).
I found one other mention of this issue on a linux.org forum (without the root cause identified):
https://www.linux.org/threads/video-car … rd0.46280/
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I faced the same issue. Workaround is to add kernel parameter "initcall_blacklist=simpledrm_platform_driver_init". The only drawback I see is longer black screen on boot.
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I've just removed the Requires/After lines from the systemd service file for the time being. The service (display manager) seems to start late enough anyway.
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