MC7304 USB disconnect every ~1000s

IoT Modules MC/EM Series
1

Hi,

I have a problem with my MC7304. I was running on Debian and Voyage linux and I notice that the device disconnects approximately every 1000s.

I can’t tell if this disconnect is initiated by the device or the OS.

(It may not be related but I also get an error when I connect (cu) to the device. It works every second connection and fails with “cu: write: Input/output error” on the subsequent attempt.)

Appreciate any help.

Oct 11 09:53:43 localhost vmunix: [ 1359.502189] usb 5-1: USB disconnect, device number 3
Oct 11 09:53:43 localhost vmunix: [ 1359.507976] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Oct 11 09:53:43 localhost vmunix: [ 1359.516117] option 5-1:1.0: device disconnected
Oct 11 09:53:43 localhost vmunix: [ 1359.521174] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
Oct 11 09:53:43 localhost vmunix: [ 1359.529316] option 5-1:1.4: device disconnected
Oct 11 09:53:57 localhost vmunix: [ 1373.384054] usb 5-1: new full-speed USB device number 4 using ohci-pci
Oct 11 09:53:57 localhost vmunix: [ 1373.532636] usb 5-1: config 1 has an invalid interface number: 4 but max is 1
Oct 11 09:53:57 localhost vmunix: [ 1373.539867] usb 5-1: config 1 has no interface number 1
Oct 11 09:53:57 localhost vmunix: [ 1373.551626] usb 5-1: New USB device found, idVendor=1199, idProduct=68c0
Oct 11 09:53:57 localhost vmunix: [ 1373.558356] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Oct 11 09:53:57 localhost vmunix: [ 1373.565505] usb 5-1: Product: MC7304
Oct 11 09:53:57 localhost vmunix: [ 1373.569102] usb 5-1: Manufacturer: Sierra Wireless, Incorporated
Oct 11 09:53:57 localhost vmunix: [ 1373.575123] usb 5-1: SerialNumber: 0123456789ABCDEF
Oct 11 09:53:57 localhost vmunix: [ 1373.582268] option 5-1:1.0: GSM modem (1-port) converter detected
Oct 11 09:53:57 localhost vmunix: [ 1373.588841] usb 5-1: GSM modem (1-port) converter now attached to ttyUSB0
Oct 11 09:53:57 localhost vmunix: [ 1373.595951] option 5-1:1.4: GSM modem (1-port) converter detected
Oct 11 09:53:57 localhost vmunix: [ 1373.602300] usb 5-1: GSM modem (1-port) converter now attached to ttyUSB1
Oct 11 10:10:33 localhost vmunix: [ 2369.763368] usb 5-1: USB disconnect, device number 4
Oct 11 10:10:33 localhost vmunix: [ 2369.769064] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Oct 11 10:10:33 localhost vmunix: [ 2369.777204] option 5-1:1.0: device disconnected
Oct 11 10:10:33 localhost vmunix: [ 2369.782249] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
Oct 11 10:10:33 localhost vmunix: [ 2369.790421] option 5-1:1.4: device disconnected
Oct 11 10:10:47 localhost vmunix: [ 2383.698185] usb 5-1: new full-speed USB device number 5 using ohci-pci
Oct 11 10:10:47 localhost vmunix: [ 2383.847966] usb 5-1: config 1 has an invalid interface number: 4 but max is 1
Oct 11 10:10:47 localhost vmunix: [ 2383.855217] usb 5-1: config 1 has no interface number 1
Oct 11 10:10:47 localhost vmunix: [ 2383.866952] usb 5-1: New USB device found, idVendor=1199, idProduct=68c0
Oct 11 10:10:47 localhost vmunix: [ 2383.873685] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Oct 11 10:10:47 localhost vmunix: [ 2383.880856] usb 5-1: Product: MC7304
Oct 11 10:10:47 localhost vmunix: [ 2383.884458] usb 5-1: Manufacturer: Sierra Wireless, Incorporated
Oct 11 10:10:47 localhost vmunix: [ 2383.890489] usb 5-1: SerialNumber: 0123456789ABCDEF
Oct 11 10:10:47 localhost vmunix: [ 2383.897350] option 5-1:1.0: GSM modem (1-port) converter detected
Oct 11 10:10:47 localhost vmunix: [ 2383.904044] usb 5-1: GSM modem (1-port) converter now attached to ttyUSB0
Oct 11 10:10:47 localhost vmunix: [ 2383.911190] option 5-1:1.4: GSM modem (1-port) converter detected
Oct 11 10:10:47 localhost vmunix: [ 2383.917517] usb 5-1: GSM modem (1-port) converter now attached to ttyUSB1

2

Hi glnmr,
I am not sure the cause of disconnect issue, but from your log, the driver used is not for MC7304.

Please try install official MC7304 driver from Sierra and see any improvement.
http://source.sierrawireless.com/resources/airprime/software/usb-drivers-linux-qmi-software-s2,-d-,24n2,-d-,33/

Hope it helps.
Thx

3

Thanks for your reply lotam.

It turns out that this seems to be related to a specific device I have. I checked with a second device and this does not happen. The devices seem identical - same firmware and configuration (as far as I can tell), although the device is also acting strangely in other ways too.