Felix Miata wrote:

> Whether what I did might work for others may depend on the distro used
> and/or whether or how plymouth is configured and/or installed. None of my
> installations have plymouth installed except for Mageia, which is unusable
> if plymouth installation is disallowed. In Mageia I include
> plymouth.enable=0 or noplymouth on Grub's kernel cmdline and/or disable
> plymouth with systemctl.
> 
> For purposes of this thread, /etc/systemd/system/tdm.service did not
> exist. I copied it from /lib/systemd/system/ and then modified it. IIRC, I
> was using Bullseye only, not Buster as I wrote in OP.

Always better to test on default setup - I am not sure if plymouth is
installed by default, but I tested on a fresh installed Debian and this
exactly solved the problem. It was also confirmed in the original bug
report. No need to further muddy the waters.

What I understand is perhaps it is a plymouth related. If I have the time I
would do some testing, find the bug and update there.

regards