Linux gnu 5.4.13-gnu can't login to new session c.1 for user gdm

[Hubert Lombard]

Hi Guix!

I'm writing this message from my Guix System 1.0.1, running the Linux gnu 
5.4.13-gnu #1 SMP 1 x86_64 GNU/Linux kernel.

Normally, I should be with the 5.4.14 kernel, but after doing the 
reconfiguration, I seemed to see an error or warning message that mentioned a 
ModemManager problem.

On restart, I don't get the new session c.1 for user gdm . Here is the info 
that appears:

-------------------------------------------------------------------------------------------------------------------
ModemManager[381]: <info> ModemManager (version 1.10.8) starting in system 
bus... 
ModemManager[381]: <info> Couldn't check support for device 
'/sys/devices/pci0000:00/0000:1c.0/0000:02:00.0' : not supported by any plugin
ModemManager[381]: <info> Couldn't check support for device 
'/sys/devices/pci0000:00/0000:1c.0/0000:03:00.0' : not supported by any plugin
-------------------------------------------------------------------------------------------------------------------

On  5.4.13-gnu, all the things work fine. I use the gnome-shell environment.

After a look at the mailing list and in the irc logs, not noticing anything 
about it, I decided to post here to see more clearly.

Thank you in advance if you know anything about it.

Have a nice day.

Hubert