I'm starting to suspect our patch (comment #39) isn't directly to blame
for the systemd issue. Disabling or otherwise breaking systemd-
fsckd.service doesn't stop fsck output from polluting the console and
triggering this bug. Only skipping fsck avoids it. You can skip fsck
using 'fastboot' or 'fsck.mode=skip' on the kernel command line.

The fact that fsck prints a useless success message to its stdout is the
issue, but it's upstream systemd asking for that:

  https://github.com/systemd/systemd/blob/main/src/fsck/fsck.c#L336

and there doesn't seem to be any simple fsck parameter to tell it to run
more quietly (systemd already uses fsck -T).

I think maybe Red Hat unwittingly works around the problem by starting
the Plymouth splash earlier in initrd because they have SimpleDRM
enabled.

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https://bugs.launchpad.net/bugs/1970069

Title:
  Annoying boot messages interfering with splash screen

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