FS#74366 - [modemmanager] Regression: Sierra Wireless EM7455 cannot be enabled since 1.18.4

Attached to Project: Arch Linux
Opened by Stefan Tatschner (rumpelsepp) - Wednesday, 06 April 2022, 07:49 GMT
Last edited by Jan Alexander Steffens (heftig) - Wednesday, 27 April 2022, 23:02 GMT
Task Type Bug Report
Category Packages: Extra
Status Closed
Assigned To Jan Alexander Steffens (heftig)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

There is a change in the unlocking logic in ModemManager 1.18.4 [1]. This caused my modem to stop working [2].

This can be fixed with (according to the upstream issue [2]):

$ sudo ln -sft /etc/ModemManager/fcc-unlock.d /usr/share/ModemManager/fcc-unlock.available.d/*

I can confirm this fix works on Arch. I figure that these symlinks should somehow be handled by the package.

[1]: https://modemmanager.org/docs/modemmanager/fcc-unlock/
[2]: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/545
This task depends upon

Closed by  Jan Alexander Steffens (heftig)
Wednesday, 27 April 2022, 23:02 GMT
Reason for closing:  Not a bug
Additional comments about closing:  required unlocks must configured manually
Comment by Aleksander Morgado (aleksander0m) - Wednesday, 06 April 2022, 08:47 GMT
Please read the https://modemmanager.org/docs/modemmanager/fcc-unlock/ page
The Arch Linux package SHOULD NOT create those links, they must be created by each user under their own responsibility.
Comment by Aleksander Morgado (aleksander0m) - Wednesday, 06 April 2022, 09:08 GMT
I understand that page is a long read and not everyone is interested :)

I've now pushed a shorter summary section, with just a few lines to read if you're not interested in all the details, please see https://modemmanager.org/docs/modemmanager/fcc-unlock/#short-summary
Comment by Stefan Tatschner (rumpelsepp) - Wednesday, 06 April 2022, 09:09 GMT
From an end user perspective, however, I strongly disagree with the current state. After updating modemmanager, my modem stopped working. That is unfortunate and there should be at least a hint that some links must be created to ensure a functioning modem.

edit: Thanks for updating the documentation!
Comment by Aleksander Morgado (aleksander0m) - Wednesday, 06 April 2022, 09:56 GMT
> From an end user perspective, however, I strongly disagree with the current state

I'm sorry for that, the decision to keep things this way is fully on me exclusively. Forcing the users to manually setup the links is the only way we found to try to keep everyone happy, it's the "less bad solution". I know users are affected, but hopefully anyone looking for how to enable back the modem connection will be able to find that documentation page easily.
Comment by Jan Alexander Steffens (heftig) - Wednesday, 27 April 2022, 23:01 GMT
Thanks for your input, Aleksander.

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