After i have upgraded some computers from stretch to buster, i got a
strange problem with XDM and Xorg.
It doesn't happen everytime and i'm not able to recreate this when i
want, but often occurs the first time I turn on the computer during the day.

It happens XDM doesn't start after the boot, TTY appears and if i try to
start it manually with systemctl, it fails.
After that, if i reboot the machine everything will work perfectly, XDM
will appear and i will be able to log in.
I analized some logs, but i wasn't able to find the cause of this. I
tried to check systemctl status too and it said: "status: degraded".

With stretch i didn't have this kind of problem with any computer, and
now I have this with different machine model, some Intel, some Radeon
and some Nouveau. I think there is something when it try to load some
drivers...I put some log attachments.

uname -a

Linux XXX 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1 (2019-09-20)
x86_64 GNU/Linux

Thank you,
Loris



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