Dear Maintainer,


Fibocom FM350-GL is not usable after upgrading to trixie modemmanager
1.24.0-1 due to the following bug which is fixed in 1.24.2 upstream.

This is a regression, the modem was working in bookworm.

https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/975


The error message is as follows:

Jul 31 17:20:20 elitebook ModemManager[1521]: Bail out! ERROR:../src/plugins/fibocom/mm-shared-fibocom.c:78:get_private: assertion failed: (MM_SHARED_FIBOCOM_GET_IFACE (self)->peek_parent_firmware_interface)


The upstream patch commit can be found here:

https://gitlab.freedesktop.org/dcbw/ModemManager/-/commit/046b79a6766b6384db9cd56a9af5d148787bafe4?view=inline

diff --git a/src/plugins/fibocom/mm-shared-fibocom.c b/src/plugins/fibocom/mm-shared-fibocom.c
index 89be09efbc244a707e7fc5b7b30756650653fdcd..0fbc9b5995609ce839f653cf124013a072b93f8d 100644
--- a/src/plugins/fibocom/mm-shared-fibocom.c
+++ b/src/plugins/fibocom/mm-shared-fibocom.c
@@ -75,8 +75,8 @@ get_private (MMSharedFibocom *self)
         priv->class_parent = MM_SHARED_FIBOCOM_GET_IFACE (self)->peek_parent_class (self);

         /* Setup firmware interface of parent class */
-        g_assert (MM_SHARED_FIBOCOM_GET_IFACE (self)->peek_parent_firmware_interface);
-        priv->iface_modem_firmware_parent = MM_SHARED_FIBOCOM_GET_IFACE (self)->peek_parent_firmware_interface (self);
+        if (MM_SHARED_FIBOCOM_GET_IFACE (self)->peek_parent_firmware_interface)
+            priv->iface_modem_firmware_parent = MM_SHARED_FIBOCOM_GET_IFACE (self)->peek_parent_firmware_interface (self);

         g_object_set_qdata_full (G_OBJECT (self), private_quark, priv, (GDestroyNotify)private_free);
     }




Fibocom FM350-GL has a quite wide user base because it is shipped
with HP elitebooks and Lenovo thinkpads and according to the patched
file name the same issue may affect further models.

Installing the currently experimental 1.25.0 fixes the issue in trixie.


Please consider upgrading the modemmanager package to 1.24.2 or cherry picking the
patch.

We believe that the bug you reported is fixed in the latest version of
modemmanager, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1110197@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Arnaud Ferraris <aferraris@debian.org> (supplier of updated modemmanager package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 11 Aug 2025 12:00:42 +0200
Source: modemmanager
Architecture: source
Version: 1.24.2-1
Distribution: unstable
Urgency: medium
Maintainer: DebianOnMobile Maintainers <debian-on-mobile-maintainers@alioth-lists.debian.net>
Changed-By: Arnaud Ferraris <aferraris@debian.org>
Closes: 1110197
Changes:
 modemmanager (1.24.2-1) unstable; urgency=medium
 .
   * New upstream release (Closes: #1110197)
   * d/control: drop Rules-Requires-Root.
     This is no longer needed.
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Hi,

Le 31/07/2025 à 20:00, Nikola Ilo a écrit :

Thanks for your detailed report! The bug is fixed in unstable where I
just uploaded the new upstream release, and I've prepared a backport for
stable-updates.

As I don't have any compatible hardware, I'd appreciate it if one could
confirm the CI-generated package from
https://salsa.debian.org/DebianOnMobile-team/modemmanager/-/merge_requests/34
does indeed fix this issue on Trixie (I'm fairly confident it does as
this change is trivial, although real-world testing never hurts).

Cheers,
Arnaud

I have been running the sid package from 1.24.2 and the bug is indeed fixed :-).

Thank you for reacting so quickly.

Cheers,
Nikola

We believe that the bug you reported is fixed in the latest version of
modemmanager, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1110197@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Arnaud Ferraris <aferraris@debian.org> (supplier of updated modemmanager package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 11 Aug 2025 10:51:27 +0200
Source: modemmanager
Architecture: source
Version: 1.24.0-1+deb13u1
Distribution: trixie
Urgency: medium
Maintainer: DebianOnMobile Maintainers <debian-on-mobile-maintainers@alioth-lists.debian.net>
Changed-By: Arnaud Ferraris <aferraris@debian.org>
Closes: 1110197
Changes:
 modemmanager (1.24.0-1+deb13u1) trixie; urgency=medium
 .
   * d/gbp.conf: target stable branch
   * d/patches: backport upstream fix for Fibocom FM350-GL (Closes: #1110197)
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