Package: modemmanager
Version: 1.22.0-3+b2
Severity: important
Tags: patch
X-Debbugs-Cc: jade...@proton.me
Dear Maintainer,
i attempted to use a Fibocom L830 modem recently, using modemmanager_1.20.4-1
from stable. it worked, but only PPP on a single port, no signal status etc.
i researched briefly, and gave up, because i am not a programmer and not smart,
just a user on holidays, assuming that the device is missing some things i was
expecting to see in USB descriptors, so MM could only do what it saw, which
was to fall back to legacy/generic ppp modes.
even more recently, i foolishly upgraded to testing at the first sight of wifi.
upon reboot, I now had modemmanager 1.22.0-3+b2 and no functioning modem.
i don't remember the exact message- but it was like no modem present.
i know the modem didn't fall out of the laptop, so i investigated.
by using sudo modemmanager --debug, i could see /dev/ttyACM* entries being
ignored for probe, along wiht another message (sorry, don't recall exactly)
reporting that plugin/fibocom was ignoring these - this was not matching
a hardcoded driver selection criteria.
thankfully i found wifi for long enough to apt-get source.
so, I present a patch that got me back online:
udev rules are added to give MM hints as to which parts of the modem,
will be performing each function. the eps_off_on is also enabled,
which i found successful in making mm succeed with mbim, not ppp fallback
finally we also change permitted drivers. i hate this part so so much!
i think the blame is on the hardware for claiming to be something it is not
but what can we do? flashing is scary. i have no data left for windows isos
on my travels. maybe most other users don't too. so maybe it's okay. idk.
after i built new deb, wwan works, and even shows signal strength \o/
maybe this helps someone else out.
diff --git a/src/plugins/fibocom/77-mm-fibocom-port-types.rules
b/src/plugins/fibocom/77-mm-fibocom-port-types.rules
index 5793cd6..6c456b4 100644
--- a/src/plugins/fibocom/77-mm-fibocom-port-types.rules
+++ b/src/plugins/fibocom/77-mm-fibocom-port-types.rules
@@ -8,6 +8,18 @@ LABEL="mm_fibocom_port_types"
SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}=="?*",
ENV{.MM_USBIFNUM}="$attr{bInterfaceNumber}"
+# Fibocom L830 - GTUSBMODE=2
+# enx000011121314 (if #0): manual says mbim but appears ncm
+# ttyACM0 (if #2): AT port
+# ttyACM1 (if #4): debug port (ignore)
+# ttyACM2 (if #6): AT port
+ATTRS{idVendor}=="2cb7" ,ATTRS{idProduct}=="0002", ENV{.MM_USBIFNUM}=="00",
SUBSYSTEM=="net", ENV{ID_MM_PORT_TYPE_MBIM}="1"
+ATTRS{idVendor}=="2cb7", ATTRS{idProduct}=="0002",
ENV{ID_MM_FIBOCOM_INITIAL_EPS_OFF_ON}="1"
+ATTRS{idVendor}=="2cb7", ATTRS{idProduct}=="0002", ENV{.MM_USBIFNUM}=="02",
SUBSYSTEM=="tty", ENV{ID_MM_PORT_TYPE_AT_PRIMARY}="1"
+ATTRS{idVendor}=="2cb7", ATTRS{idProduct}=="0002", ENV{.MM_USBIFNUM}=="04",
ENV{ID_MM_PORT_IGNORE}="1"
+ATTRS{idVendor}=="2cb7", ATTRS{idProduct}=="0002", ENV{.MM_USBIFNUM}=="06",
SUBSYSTEM=="tty", ENV{ID_MM_PORT_TYPE_AT_SECONDARY}="1"
+
+
# Fibocom L850-GL attach APN with toggle modem power
ATTRS{idVendor}=="2cb7", ATTRS{idProduct}=="0007",
ENV{ID_MM_FIBOCOM_INITIAL_EPS_OFF_ON}="1"
diff --git a/src/plugins/fibocom/mm-plugin-fibocom.c
b/src/plugins/fibocom/mm-plugin-fibocom.c
index a30575e..b1415b8 100644
--- a/src/plugins/fibocom/mm-plugin-fibocom.c
+++ b/src/plugins/fibocom/mm-plugin-fibocom.c
@@ -111,7 +111,7 @@ mm_plugin_create_fibocom (void)
{
static const gchar *subsystems[] = { "tty", "net", "usbmisc", NULL };
static const guint16 vendor_ids[] = { 0x2cb7, 0x1782, 0 };
- static const gchar *drivers[] = { "cdc_mbim", "qmi_wwan", "cdc_ether",
"option", NULL };
+ static const gchar *drivers[] = { "cdc_mbim", "qmi_wwan", "cdc_ether",
"cdc_acm", "cdc_ncm", "option", NULL };
return MM_PLUGIN (
g_object_new (MM_TYPE_PLUGIN_FIBOCOM,
-- System Information:
Debian Release: trixie/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 6.12.5-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages modemmanager depends on:
ii libc6 2.40-4
ii libglib2.0-0t64 2.82.4-1
ii libgudev-1.0-0 238-5+b1
ii libmbim-glib4 1.30.0-1+b2
ii libmbim-proxy 1.30.0-1+b2
ii libmm-glib0 1.22.0-3+b2
ii libpolkit-gobject-1-0 125-2
ii libqmi-glib5 1.34.0-2+b2
ii libqmi-proxy 1.34.0-2+b2
ii libqrtr-glib0 1.2.2-1+b2
ii libsystemd0 257-2
ii polkitd 125-2
Versions of packages modemmanager recommends:
ii libmbim-utils 1.30.0-1+b2
ii libqmi-utils 1.34.0-2+b2
ii usb-modeswitch 2.6.1-4+b1
modemmanager suggests no packages.
-- no debconf information
