> > Hey Bjørn & all, > > > > I wonder if you have any idea why this issue is happening? > > https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/165#note_368404 > > > > We can see how the kernel driver reported as managing the device that > > owns the cdc-wdm port changes from cdc_mbim (original one after boot) > > to qmi_wwan (after a suspend/resume cycle). This makes ModemManager > > attempt QMI probing instead of MBIM probing on the port, and that > > fails, so the modem is no longer used after the suspend/resume cycle. > > > > Any hint? > > I have the same laptop myself, and can comfirm that it has this annoying > issue with removing power from the modem slot on suspend. Which means > that the modem will always do a full boot with driver probing and MM > probing on every resume. Pretty stupid platform design if you ask me, > unnecessarily delaying startup after resume and preventing persistent > connections to the network. > > But this platform bug doesn't explain the change of driver. That is > casued by some unknown change to the qmi_wwan driver. Notice how it is > probing USB interface #12 here: > > [gio dic 19 10:27:02 2019] qmi_wwan 1-2:1.12: cdc-wdm0: USB WDM device > [gio dic 19 10:27:02 2019] qmi_wwan 1-2:1.12 wwan0: register 'qmi_wwan' at > usb-0000:00:14.0-2, WWAN/QMI device, da:5e:a6:8f:c8:1f > [gio dic 19 10:27:02 2019] qmi_wwan 1-2:1.12 wwan0: unregister 'qmi_wwan' > usb-0000:00:14.0-2, WWAN/QMI device > [gio dic 19 10:27:02 2019] qmi_wwan 1-2:1.12: cdc-wdm0: USB WDM device > [gio dic 19 10:27:02 2019] qmi_wwan 1-2:1.12 wwan0: register 'qmi_wwan' at > usb-0000:00:14.0-2, WWAN/QMI device, da:5e:a6:8f:c8:1f > [gio dic 19 10:27:03 2019] qmi_wwan 1-2:1.12 wwp0s20f0u2i12: renamed from > wwan0 > > > This is only possible if either the driver is modified or the EM7455 > device ID is added dynamically. I am guessing the latter, and that this > breakage was added *after* the initial boot probing. > > Check with e.g: > > cat /sys/bus/usb/drivers/qmi_wwan/new_id > > It should normally output nothing. >
The user reports the following: root@angelo-thinkpad-x1-carbon-4th:~# cat /sys/bus/usb/drivers/qmi_wwan/new_id 1199 9079 root@angelo-thinkpad-x1-carbon-4th:~# cat /sys/bus/usb/drivers/qmi_wwan/remove_id 1199 9079 Does this mean something is injecting those ids dynamically during runtime? -- Aleksander https://aleksander.es _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
