Q2698 usb serial issue

Legacy Legacy AirPrime modules
1

Hi all,

I’m using a Q2698 modem on a Linux ditro with the right driver for sierra wireless modem.
The kernel version is 2.6.35.14.
The modem firmware version is R7.50

The Q2698 has several virtual serial port on a unique usb link (ttyUSB0, ttyUSB1, … ttyUSB4). The thing is, the right tty for using data link (through ppp daemon) is not consistent between modems (on one modem i have to use ttyUSB2, ttyUSB3 on another, and, sometimes ttyUSB4). If we try with the wrong ttyUSBx, the interface froze… This is not acceptable for production.

Our software works wel with Q26Extreme and Q2686, we used to configured data link through usb with AT+WMFM cmd (which returned ERROR on Q2698).
Is there any way to configure which ttyUSBx port to use for data and AT cmd. Which command are we missing.

Thanks in advance.
Florent

2

Hi,

AT+WMFM is returning what error?
use AT+CMEE=1 to enable the error codes…

3

AT+CMEE=1
OK
AT+WMFM
+CME ERROR: 3

4

I meant what parameters are you giving with AT+WMFM …

Just writing AT+WMFM will give error only… check the AT command guide for the command description…

5

The same error is returned

AT+WMFM=1,1,3,1
+CME ERROR: 3

This is working on Q2686 and Q26Extreme for routing GPRS data through usb link. These two modems have only one usb - serial interface (ttyACMx) but Q2698 expose five serials over USB (ttyUSB[0-4], using the sierra wireless linux kernel module)

According to the AT commande guide, this commande is tagges as “Partially supported or with specific behavior” for Q2698 modem.
And the note section about this command is not clear enough about the case of Q2698.

6

Is there a way to know the role of which ttyUSB device (there is 5 ttyUSB created by sierra usb serial driver). I do not see in the documentation a way to know that, nor to configure that.

I’ve got three Q2698 module, and it is a different device for each

7

Hiya,

Under Linux, you’ll probably have to configure the UDEV rules to map each device to the same tty ports.

ciao, Dave

8

Nop,
The number of ttyUSBn is computed by the sierra usb serial driver itself according to free slots and the NumEndpoints of the interface. In my platform, it is the only usb serial device.

Here the result of lsusb -v, it is exactly the same on each Q2698 I use.

Bus 001 Device 004: ID 1199:68a3 Sierra Wireless, Inc. MC8700 Modem
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x1199 Sierra Wireless, Inc.
  idProduct          0x68a3 MC8700 Modem
  bcdDevice            0.06
  iManufacturer           3 Sierra Wireless, Incorporated
  iProduct                2 Q2698
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          168
    bNumInterfaces          6
    bConfigurationValue     1
    iConfiguration          1 Sierra Configuration
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x87  EP 7 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        7
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x88  EP 8 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x89  EP 9 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x06  EP 6 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval              32

We notice that the port to use for data (through ppp daemon) is not the same between Q2698 module we have.
On the first sample (received last year) it was ttyUSB2. And now we have some working through ttyUSB4 and other through ttyUSB3…

The first one have a beta firmware (B7.50), others have a R7.50 firmware.

I noticed that ttyUSB4 seems to be the default for data connection, but sending AT+WMFM=1,1,3,1 (command we used to configure gprs data through usb link on Q2686 and Q26Extreme), which is tagged not defined for Q2698, switch the connection through ttyUSB3 port. THIS is not specified and there is no way to know each ttyUSBn function (which one is the AT command link, GPRS/3G link, debug, nmea, etc.), and there is no way to reconfigure gprs/3g data link through the ttyUSB4 default port.

9

Hi all,

I have another issue with Q2698 module…

Sometimes, the usb device is not a Q2698 but a Qualcomm modem which is not responding on serial port nor usb port.
After several reset of the usb device is finnally seen as a SierraWireless modem…

[   11.756869] usb 1-3: USB disconnect, address 3
[   14.044070] usb 1-3: new high speed USB device using ehci_hcd and address 4
[   14.173029] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[   14.173050] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   14.173067] usb 1-3: Product: QHSUSB_DLOAD
[   14.173081] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[   42.114720] usb 1-3: USB disconnect, address 4
[   44.396072] usb 1-3: new high speed USB device using ehci_hcd and address 5
[   44.529003] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[   44.529018] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   44.529031] usb 1-3: Product: QHSUSB_DLOAD
[   44.529040] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[   72.449336] usb 1-3: USB disconnect, address 5
[   74.736072] usb 1-3: new high speed USB device using ehci_hcd and address 6
[   74.868991] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[   74.869007] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   74.869020] usb 1-3: Product: QHSUSB_DLOAD
[   74.869029] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  102.748942] usb 1-3: USB disconnect, address 6
[  105.028069] usb 1-3: new high speed USB device using ehci_hcd and address 7
[  105.160972] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  105.160987] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  105.161000] usb 1-3: Product: QHSUSB_DLOAD
[  105.161010] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  133.053547] usb 1-3: USB disconnect, address 7
[  138.664079] usb 1-3: new high speed USB device using ehci_hcd and address 8
[  138.796939] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  138.796954] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  138.796967] usb 1-3: Product: QHSUSB_DLOAD
[  138.796977] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  163.365529] usb 1-3: USB disconnect, address 8
[  165.648067] usb 1-3: new high speed USB device using ehci_hcd and address 9
[  165.781073] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  165.781088] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  165.781101] usb 1-3: Product: QHSUSB_DLOAD
[  165.781110] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  193.674407] usb 1-3: USB disconnect, address 9
[  199.288066] usb 1-3: new high speed USB device using ehci_hcd and address 10
[  199.429148] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  199.429164] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  199.429177] usb 1-3: Product: QHSUSB_DLOAD
[  199.429186] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  223.967739] usb 1-3: USB disconnect, address 10
[  226.248066] usb 1-3: new high speed USB device using ehci_hcd and address 11
[  226.385039] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  226.385059] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  226.385072] usb 1-3: Product: QHSUSB_DLOAD
[  226.385082] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  254.273345] usb 1-3: USB disconnect, address 11
[  259.880071] usb 1-3: new high speed USB device using ehci_hcd and address 12
[  260.013986] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  260.014001] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  260.014014] usb 1-3: Product: QHSUSB_DLOAD
[  260.014023] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  284.577342] usb 1-3: USB disconnect, address 12
[  290.192068] usb 1-3: new high speed USB device using ehci_hcd and address 13
[  290.324969] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  290.324984] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  290.324997] usb 1-3: Product: QHSUSB_DLOAD
[  290.325015] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  314.877186] usb 1-3: USB disconnect, address 13
[  317.156075] usb 1-3: new high speed USB device using ehci_hcd and address 14
[  317.292968] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  317.292983] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  317.292996] usb 1-3: Product: QHSUSB_DLOAD
[  317.293014] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  345.177540] usb 1-3: USB disconnect, address 14
[  350.788068] usb 1-3: new high speed USB device using ehci_hcd and address 15
[  350.920930] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  350.920945] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  350.920977] usb 1-3: Product: QHSUSB_DLOAD
[  350.920992] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  375.458899] usb 1-3: USB disconnect, address 15
[  377.740066] usb 1-3: new high speed USB device using ehci_hcd and address 16
[  377.873074] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  377.873089] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  377.873102] usb 1-3: Product: QHSUSB_DLOAD
[  377.873111] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  405.763757] usb 1-3: USB disconnect, address 16
[  408.044070] usb 1-3: new high speed USB device using ehci_hcd and address 17
[  408.177039] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  408.177055] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  408.177068] usb 1-3: Product: QHSUSB_DLOAD
[  408.177077] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  436.048748] usb 1-3: USB disconnect, address 17
[  441.660088] usb 1-3: new high speed USB device using ehci_hcd and address 18
[  441.793002] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  441.793018] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  441.793031] usb 1-3: Product: QHSUSB_DLOAD
[  441.793040] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  466.347854] usb 1-3: USB disconnect, address 18
[  468.628069] usb 1-3: new high speed USB device using ehci_hcd and address 19
[  468.761007] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  468.761023] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  468.761035] usb 1-3: Product: QHSUSB_DLOAD
[  468.761045] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  496.653082] usb 1-3: USB disconnect, address 19
[  498.932068] usb 1-3: new high speed USB device using ehci_hcd and address 20
[  499.064989] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  499.065004] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  499.065017] usb 1-3: Product: QHSUSB_DLOAD
[  499.065026] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  526.953559] usb 1-3: USB disconnect, address 20
[  529.236070] usb 1-3: new high speed USB device using ehci_hcd and address 21
[  529.368971] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  529.368987] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  529.369000] usb 1-3: Product: QHSUSB_DLOAD
[  529.369009] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  557.260300] usb 1-3: USB disconnect, address 21
[  562.868077] usb 1-3: new high speed USB device using ehci_hcd and address 22
[  563.001073] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  563.001089] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  563.001101] usb 1-3: Product: QHSUSB_DLOAD
[  563.001111] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  587.564907] usb 1-3: USB disconnect, address 22
[  593.172080] usb 1-3: new high speed USB device using ehci_hcd and address 23
[  593.305056] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  593.305076] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  593.305093] usb 1-3: Product: QHSUSB_DLOAD
[  593.305106] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  617.868887] usb 1-3: USB disconnect, address 23
[  623.476068] usb 1-3: new high speed USB device using ehci_hcd and address 24
[  623.608895] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  623.608911] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  623.608923] usb 1-3: Product: QHSUSB_DLOAD
[  623.608933] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  648.174360] usb 1-3: USB disconnect, address 24
[  650.456078] usb 1-3: new high speed USB device using ehci_hcd and address 25
[  650.589020] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  650.589036] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  650.589049] usb 1-3: Product: QHSUSB_DLOAD
[  650.589058] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  678.467970] usb 1-3: USB disconnect, address 25
[  684.076065] usb 1-3: new high speed USB device using ehci_hcd and address 26
[  684.208986] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  684.209001] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  684.209014] usb 1-3: Product: QHSUSB_DLOAD
[  684.209024] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  708.772958] usb 1-3: USB disconnect, address 26
[  711.056079] usb 1-3: new high speed USB device using ehci_hcd and address 27
[  711.188984] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  711.189000] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  711.189021] usb 1-3: Product: QHSUSB_DLOAD
[  711.189034] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  739.061940] usb 1-3: USB disconnect, address 27
[  741.348076] usb 1-3: new high speed USB device using ehci_hcd and address 28
[  741.484965] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  741.484980] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  741.484993] usb 1-3: Product: QHSUSB_DLOAD
[  741.485003] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  769.369295] usb 1-3: USB disconnect, address 28
[  771.648069] usb 1-3: new high speed USB device using ehci_hcd and address 29
[  771.780949] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  771.780964] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  771.780977] usb 1-3: Product: QHSUSB_DLOAD
[  771.780987] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  799.672284] usb 1-3: USB disconnect, address 29
[  801.953086] usb 1-3: new high speed USB device using ehci_hcd and address 30
[  802.085055] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  802.085071] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  802.085084] usb 1-3: Product: QHSUSB_DLOAD
[  802.085093] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  829.978504] usb 1-3: USB disconnect, address 30
[  832.260076] usb 1-3: new high speed USB device using ehci_hcd and address 31
[  832.393038] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  832.393053] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  832.393066] usb 1-3: Product: QHSUSB_DLOAD
[  832.393075] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  860.267619] usb 1-3: USB disconnect, address 31
[  862.548071] usb 1-3: new high speed USB device using ehci_hcd and address 32
[  862.681029] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  862.681049] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  862.681066] usb 1-3: Product: QHSUSB_DLOAD
[  862.681079] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  890.572852] usb 1-3: USB disconnect, address 32
[  897.276060] usb 1-3: new high speed USB device using ehci_hcd and address 33
[  897.409027] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  897.409048] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  897.409065] usb 1-3: Product: QHSUSB_DLOAD
[  897.409079] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  897.820203] usb 1-3: USB disconnect, address 33
[  904.236069] usb 1-3: new high speed USB device using ehci_hcd and address 34
[  904.368999] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  904.369015] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  904.369028] usb 1-3: Product: QHSUSB_DLOAD
[  904.369037] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  916.222319] usb 1-3: USB disconnect, address 34
[  931.424096] usb 1-3: new high speed USB device using ehci_hcd and address 35
[  931.556884] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  931.556900] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  931.556913] usb 1-3: Product: QHSUSB_DLOAD
[  931.556922] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[  951.155933] usb 1-3: USB disconnect, address 35
[  953.436098] usb 1-3: new high speed USB device using ehci_hcd and address 36
[  953.568969] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[  953.568984] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  953.568997] usb 1-3: Product: QHSUSB_DLOAD
[  953.569006] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[ 1090.569585] usb 1-3: USB disconnect, address 36
[ 1102.432072] usb 1-3: new high speed USB device using ehci_hcd and address 37
[ 1102.565050] usb 1-3: New USB device found, idVendor=05c6, idProduct=9008
[ 1102.565065] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 1102.565078] usb 1-3: Product: QHSUSB_DLOAD
[ 1102.565087] usb 1-3: Manufacturer: Qualcomm CDMA Technologies MSM
[ 1136.058560] usb 1-3: USB disconnect, address 37
[ 1143.192071] usb 1-3: new high speed USB device using ehci_hcd and address 38
[ 1143.325119] usb 1-3: config 1 has an invalid interface number: 7 but max is 5
[ 1143.325135] usb 1-3: config 1 has no interface number 5
[ 1143.325989] usb 1-3: New USB device found, idVendor=1199, idProduct=68a3
[ 1143.326002] usb 1-3: New USB device strings: Mfr=3, Product=2, SerialNumber=0
[ 1143.326015] usb 1-3: Product: Q2698
[ 1143.326024] usb 1-3: Manufacturer: Sierra Wireless, Incorporated
[ 1143.329200] sierra 1-3:1.0: Sierra USB modem converter detected
[ 1143.329804] usb 1-3: Sierra USB modem converter now attached to ttyUSB0
[ 1143.330210] sierra 1-3:1.1: Sierra USB modem converter detected
[ 1143.330852] usb 1-3: Sierra USB modem converter now attached to ttyUSB1
[ 1143.331254] sierra 1-3:1.2: Sierra USB modem converter detected
[ 1143.331772] usb 1-3: Sierra USB modem converter now attached to ttyUSB2
[ 1143.332218] sierra 1-3:1.3: Sierra USB modem converter detected
[ 1143.332962] usb 1-3: Sierra USB modem converter now attached to ttyUSB3
[ 1143.333420] sierra 1-3:1.4: Sierra USB modem converter detected
[ 1143.334030] usb 1-3: Sierra USB modem converter now attached to ttyUSB4
10

Florent,

Did you ever resolve your disconnect then reconnect issue? I have the same problem and I cannot figure out what is wrong.