Hello! I have connected a EG915U-E-TE-A module (Revision: EG915UEUABR03A01M08) to a UMTS<E EVB_V2.2 baseboard. The baseboard is connected to my Linux Host machine (Ubuntu 22.04) through the baseboard’s usb interface (J801), which also powers the baseboard. A SimCard is also connected in to the baseboard. At first, it seems to work correctly, as seem by the kernel logs:
[177771.010623] usb 3-4.1.2: new high-speed USB device number 126 using xhci_hcd
[177771.111420] usb 3-4.1.2: New USB device found, idVendor=1782, idProduct=4d12, bcdDevice= 3.18
[177771.111424] usb 3-4.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[177771.111425] usb 3-4.1.2: Product: Android
[177771.111426] usb 3-4.1.2: Manufacturer: Android
[177771.811719] usb 3-4.1.2: USB disconnect, device number 126
[177772.802468] usb 3-4.1.2: new high-speed USB device number 127 using xhci_hcd
[177772.902909] usb 3-4.1.2: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 32, changing to 9
[177772.903262] usb 3-4.1.2: New USB device found, idVendor=2c7c, idProduct=0901, bcdDevice= 3.18
[177772.903263] usb 3-4.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[177772.903264] usb 3-4.1.2: Product: Android
[177772.903265] usb 3-4.1.2: Manufacturer: Android
[177772.917007] cdc_ether 3-4.1.2:1.0 usb0: register ‘cdc_ether’ at usb-0000:00:14.0-4.1.2, CDC Ethernet Device, 02:4b:b3:b9:eb:e5
[177772.917528] option 3-4.1.2:1.2: GSM modem (1-port) converter detected
[177772.917635] usb 3-4.1.2: GSM modem (1-port) converter now attached to ttyUSB2
[177772.917830] option 3-4.1.2:1.3: GSM modem (1-port) converter detected
[177772.917944] usb 3-4.1.2: GSM modem (1-port) converter now attached to ttyUSB3
[177772.918145] option 3-4.1.2:1.4: GSM modem (1-port) converter detected
[177772.918273] usb 3-4.1.2: GSM modem (1-port) converter now attached to ttyUSB4
[177772.918496] option 3-4.1.2:1.5: GSM modem (1-port) converter detected
[177772.918556] usb 3-4.1.2: GSM modem (1-port) converter now attached to ttyUSB5
[177772.918701] option 3-4.1.2:1.6: GSM modem (1-port) converter detected
[177772.918756] usb 3-4.1.2: GSM modem (1-port) converter now attached to ttyUSB6
[177772.918903] option 3-4.1.2:1.7: GSM modem (1-port) converter detected
[177772.918946] usb 3-4.1.2: GSM modem (1-port) converter now attached to ttyUSB7
[177772.919093] option 3-4.1.2:1.8: GSM modem (1-port) converter detected
[177772.919134] usb 3-4.1.2: GSM modem (1-port) converter now attached to ttyUSB8
[177772.941980] cdc_ether 3-4.1.2:1.0 enx024bb3b9ebe5: renamed from usb0
However, about 20 seconds later, i get a usb disconnection from the board, as can be seen by these logs:
[177798.435739] usb 3-4.1.2: USB disconnect, device number 127
[177798.435854] cdc_ether 3-4.1.2:1.0 enx024bb3b9ebe5: unregister ‘cdc_ether’ usb-0000:00:14.0-4.1.2, CDC Ethernet Device
[177798.458832] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[177798.458841] option 3-4.1.2:1.2: device disconnected
[177798.458947] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[177798.458953] option 3-4.1.2:1.3: device disconnected
[177798.459025] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[177798.459032] option 3-4.1.2:1.4: device disconnected
[177798.459121] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5
[177798.459128] option 3-4.1.2:1.5: device disconnected
[177798.459194] option1 ttyUSB6: GSM modem (1-port) converter now disconnected from ttyUSB6
[177798.459199] option 3-4.1.2:1.6: device disconnected
[177798.459429] option1 ttyUSB7: GSM modem (1-port) converter now disconnected from ttyUSB7
[177798.459436] option 3-4.1.2:1.7: device disconnected
[177798.459496] option1 ttyUSB8: GSM modem (1-port) converter now disconnected from ttyUSB8
[177798.459504] option 3-4.1.2:1.8: device disconnected
[177799.426681] usb 3-4.1.2: new high-speed USB device number 2 using xhci_hcd
[177799.527508] usb 3-4.1.2: New USB device found, idVendor=1782, idProduct=4d12, bcdDevice= 3.18
[177799.527511] usb 3-4.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[177799.527512] usb 3-4.1.2: Product: Android
[177799.527513] usb 3-4.1.2: Manufacturer: Android
[177800.227927] usb 3-4.1.2: USB disconnect, device number 2
[177801.222566] usb 3-4.1.2: new high-speed USB device number 7 using xhci_hcd
[177801.323280] usb 3-4.1.2: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 32, changing to 9
[177801.323701] usb 3-4.1.2: New USB device found, idVendor=2c7c, idProduct=0901, bcdDevice= 3.18
[177801.323703] usb 3-4.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[177801.323704] usb 3-4.1.2: Product: Android
[177801.323705] usb 3-4.1.2: Manufacturer: Android
And sometimes after disconnetion, i also get these usb_wwan_open logs:
[177822.539292] option1 ttyUSB7: usb_wwan_open: submit int urb failed: -19
[177822.539296] option1 ttyUSB7: usb_wwan_open: submit read urb 0 failed: -19
[177822.539297] option1 ttyUSB7: usb_wwan_open: submit read urb 1 failed: -19
[177822.539298] option1 ttyUSB7: usb_wwan_open: submit read urb 2 failed: -19
[177822.539299] option1 ttyUSB7: usb_wwan_open: submit read urb 3 failed: -19
I believe this is not a power issue, as i have also powered the baseboard with an external 5V power supply.
The interesting scenario, though, is that this reset issue only happens when the SIMCard is inserted into the baseboard (and removing the SIM stops it). Modem seems to be responding to AT commands through its serial interface. In order to debug this,
- Can you provide the EG915U-E-TE-A documentation?
- Can you provide the latest module firmware?