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Hardware Librem 5
9

First you can do systemctl status ModemManager and from the output there you can see where the ModemManager.service file is located, something like /usr/lib/systemd/system/ModemManager.service

Then you can edit that ModemManager.service file, find the line that looks like this:

ExecStart=/usr/sbin/ModemManager

and change that line so that it looks like this:

ExecStart=/usr/sbin/ModemManager --debug

Then reboot. After that, you should see lots of ModemManager debug output in the log shown by the journalctl command.

See HKS not working properly on Librem 5 (L5) - #2 by Skalman

(Another way of debugging (an alternative to the above) is to stop the ModemManager service altogether and then instead simply run the command ModemManager --debug manually from the commandline. Then you get the debug output right there, in your face.)

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