[Networkmanager] NetworkManager fails to manage pppoa adsl connection

[Denis Prost]

Hello,

Since I upgraded to Debian 12 (network-manager 1.42.4-1), pppoa adsl 
connection management does not work anymore, while it worked perfectly 
with Debian 11.

The connection is created with :

nmcli c add save yes type adsl protocol pppoa con-name "adsl-speedtch0" 
username <myusername> password <mypassword> ifname speedtch0 
adsl.encapsulation llc adsl.vpi 8 adsl.vci 35 ipv4.method auto 
ipv6.method ignore

But I cannot succeed activating it :

-----------

$ nmcli connection up adsl-speedtch0
Erreur : l'activation de la connexion a échoué : No suitable device 
found for this connection (device eth0 not available because profile is 
not compatible with device (mismatching interface name)).

$ nmcli connection up adsl-speedtch0 ifname speedtch0
Erreur : l'activation de la connexion a échoué : Connection 
'adsl-speedtch0' is not available on device speedtch0 because profile is 
not compatible with device (connection type is not "pppoe")

---------

Is there some change in network-manager 1.42.4-1 that explains that 
behaviour and a way to solve it ?

Thanks !

Regards

Denis