MC7710 issues with Windows or Lenovo X230

[dl5162]

@modulator

Okay, this happened to me also so please help me out

My MC7710 in T430s stopped working after I installed latest drivers in Windows 10… the driver package was the Generic driver build 4277. Similarly my modem disappeared and there was only that MC7710 device which was shown to be “unplugged or unattached” by Windows. The MC7710 text was soon replaced by “Generic Mobile Broadband Device”. But then I installed Ubuntu (to try to revive this thing, since it could have been the MBIM thing?), and noticed that the modem was not recognized AT ALL. So I also did some live plugging and found out that it does recognize, but it disconnects after a quite constant time (tried multiple times), so WHAT is happening here??

[ 1368.001553] usb 1-4: new high-speed USB device number 6 using xhci_hcd
[ 1368.131279] usb 1-4: config 1 has an invalid interface number: 12 but max is 1
[ 1368.131286] usb 1-4: config 1 has an invalid interface number: 13 but max is 1
[ 1368.131289] usb 1-4: config 1 has an invalid interface number: 13 but max is 1
[ 1368.131292] usb 1-4: config 1 has no interface number 0
[ 1368.131295] usb 1-4: config 1 has no interface number 1
[ 1368.132971] usb 1-4: New USB device found, idVendor=1199, idProduct=68a2
[ 1368.132979] usb 1-4: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[ 1368.132983] usb 1-4: Product: MC7710
[ 1368.132987] usb 1-4: Manufacturer: Sierra Wireless, Incorporated
[ 1368.132991] usb 1-4: SerialNumber: <censored by Modulator>
[ 1368.135758] cdc_mbim 1-4:1.12: cdc-wdm0: USB WDM device
[ 1368.136082] cdc_mbim 1-4:1.12 wwan0: register 'cdc_mbim' at usb-0000:00:14.0-4, CDC MBIM, 7a:66:d9:bf:52:e3
[ 1382.680557] usb 1-4: USB disconnect, device number 6
[ 1382.680638] cdc_mbim 1-4:1.12 wwan0: unregister 'cdc_mbim' usb-0000:00:14.0-4, CDC MBIM

Thanks!

The disconnect is a new one. At least to me.

Maybe the modem firmware has started to power down in MBIM mode unless it can communicate with an MBIM driver? The cdc_mbim driver only handles part of the “normal” MBIM tasks. It leaves all MBIM management to userspace. Typically users will run ModemManager with MBIM support, which will take care of the rest.

So first guess is: The modem firmware waits ~10 seconds for MBIM OPEN before powering down. Try running ModemManager with MBIM support when the modem comes online, and see if that changes the behaviour.

You should also observe the output of “rfkill list”, which should tell you if the modem has been disabled by the laptop firmware (aka BIOS).

Or if you want to switch the modem back to QMI mode, and prevent WIndows from switching it back to MBIM mode, then see these two replies to the “My MC7710 can’t work on Linux after plug-in it to Window” discussion:

My MC7710 can't work on Linux after plug-in it to Windows8

Hi, I have a MC7710 module. It works well on Linux before. I can see ttyUSB0, ttyUSB1 and ttyUSB2 after install GobiSerial driver. I also can see qcqmi0 after install GobiNet driver. But all of them disappear now after I try to plug-in my modules to Windows8 host and dial-up LTE with SkyLight connection manager. I found there are some difference for the messages by cat /proc/bus/usb/devices. ===== While my module is workable on before, the message are as below ===== T: Bus=01 Lev=01 Pr…

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