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[Beta2][Pinephone] Mobile Data (sporadically) not working

Mobile Data is sporadically not working after (re)booting the phone. Calls are working.

This appears to be due to ofonod/ofonoctl not (properly) connecting to the modem and the wan connection not being properly established through ofono. Additionally, there's a conflict between NetworkManager and ofono on /etc/resolv.conf (see below)

In my case, ofonoctl does not have any information on the modem, e.g.:

[root@pinephone ~]# ofonoctl                           
Modem         Status        SIM
------------  ------------  -------
quectelqmi_0  Unregistered  Unknown
[root@pinephone ~]# ofonoctl wan
Could not fetch contexts on the modem

In this state, ofonoctl wan cannot be used to connect to the mobile network.

This does not always happen after (re)boots and might break spontaneously. Most times, after unlocking the SIM, the mobile network is connected and ofonoctl wan shows the proper information (see below). However, DNS reoslution is broken (nameservers not in resolv.conf)

steps to fix DNS

[root@pinephone ~]# ofonoctl wan
Interface    Protocol    APN              Method    Address            Gateway         DNS
-----------  ----------  ---------------  --------  -----------------  --------------  --------------------------
wwan0        ipv4        web.vodafone.de  static    100.80.YYY.XXX/30  100.80.221.193  139.7.30.126, 139.7.30.125

for each DNS server, add a nameserver line to /etc/resolv.conf

steps to fix modem + DNS

After systemctl restart ofono and going through the init sequence described e.g. here, modem info is back:

[root@pinephone ~]# ofonoctl 
Modem         Status                       SIM
------------  ---------------------------  -------
quectelqmi_0  Registered to 26202 (80.0%)  Unknown

Then, ofonoctl also shows wan information

[root@pinephone ~]# ofonoctl wan
Interface    Protocol    APN              Method    Address            Gateway         DNS
-----------  ----------  ---------------  --------  -----------------  --------------  --------------------------
wwan0        ipv4        web.vodafone.de  static    100.80.YYY.XXX/30  100.80.221.193  139.7.30.126, 139.7.30.125

Despite this, connections via mobile data are not possible. This can be solved through ofonoctl wan --connect --append-dns, which configures the interface and adds the DNS servers (shown above) to /etc/resolv.conf.

[root@pinephone ~]# cat /etc/resolv.conf 
# Generated by NetworkManager
nameserver 10.0.1.1
nameserver 10.0.0.1

# DNS servers set by ofonoctl
nameserver 139.7.30.126
nameserver 139.7.30.125
# end

DNS conflict with NetworkManager

⚠ Once Wifi is disabled (e.g. via the menu on the phone), /etc/resolv.conf is emptied fully, which obviously breaks DNS resolution.

The mobile data connection stays up according to ip a, however.

Here, apparently, NetworkManager is disregarding other applications' changes to the resolv.conf

Edited by Michael Lenz