Ethernet not working on a Dell notebook

[Franco Martelli <martellif67@gmail.com>]

> On 13/03/24 at 16:06, Max Nikulin wrote:
> > On 13/03/2024 21:52, Franco Martelli wrote:
> > > Do you have configured both NetworkManager and Debian 
> > > /etc/network/interfaces? They cannot coexist,
> >
> > They can coexist. NetworkManager in default configuration ignores 
> > interfaces under control of ifupdown (/etc/network/interfaces).
> >
> > Detailed messages from NetworkManager related to carrier change events 
> > are missed in the posted log file, so the interface is configured by 
> > ifupdown.
Sorry Max I always knew that they cannot, my mistake…

On 13/03/24 at 16:14, frantal@libero.it wrote:

> root@debian:/home/frantal# sudo journalctl -u NetworkManager.service
> ago 09 01:48:22 debian systemd[1]: Starting Network Manager...
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.0709] NetworkMa>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.0710] Read conf>
> ago 09 01:48:23 debian systemd[1]: Started Network Manager.
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.0836] bus-manag>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.0968] manager[0>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.0968] monitorin>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2567] hostname:>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2567] hostname:>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2574] dns-mgr[0>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2590] rfkill0: >
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2593] manager[0>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2593] manager[0>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2739] Loaded de>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2818] Loaded de>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2872] Loaded de>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2891] Loaded de>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2942] Loaded de>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2947] manager: >
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2949] manager: >
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2951] manager: >
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2953] dhcp-init>
> ago 09 01:48:23 debian NetworkManager[545]: <info>  [1660002503.2997] settings:>

Sadly the useful information of the command output is truncated, could 
you post it again maximizing the window before you copy? For the 
journalctl command use this syntax:

~# journalctl -u NetworkManager.service --boot

Googling for a kernel message in a your previous post:

...
[    2.771916] r8168: module verification failed: signature and/or 
required key missing - tainting kernel
...

I find this hint:

https://wiki.archlinux.org/title/Talk:Network_configuration/Ethernet

So after configured the interfaces, you could try to add "iommu=soft 
amd_iommu" to the kernel command-line, if you use Grub to boot the 
system, you need to edit /etc/default/grub and add that string to 
GRUB_CMDLINE_LINUX_DEFAULT variable.
Don't forget to run:

~# update-grub

in order to make effective the changes.

--
Franco Martelli