Cellular IOT Hat Cycling Power

End-of-Life Product Cellular IoT HAT
1

I’m reinstalling the HAT on a new OS build and having troubles. The previous install worked great with full LTE connection.

I’m having trouble bringing the HAT up after a reboot (even press-holding the PWR), and when it does, the HAT seems to be power cycling. I first notice this when in /dev/ttyUSB* when the devices would appear and then disappear.

I am using an official RPi power supply, and removed the 3.5" LCD unit to confirm that it wasn’t a sagging power supply. Any ideas?

My dmesg is below:

[  538.216192] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  538.216352] option 1-1.1:1.3: device disconnected
[  538.216883] qmi_wwan 1-1.1:1.4 wwan0: unregister 'qmi_wwan' usb-0000:01:00.0-1.1, WWAN/QMI device
[  547.205213] usb 1-1.1: new high-speed USB device number 25 using xhci_hcd
[  547.336864] usb 1-1.1: New USB device found, idVendor=2c7c, idProduct=0296, bcdDevice= 0.00
[  547.336873] usb 1-1.1: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[  547.336881] usb 1-1.1: Product: Qualcomm CDMA Technologies MSM
[  547.336888] usb 1-1.1: Manufacturer: Qualcomm, Incorporated
[  547.336895] usb 1-1.1: SerialNumber: 59920727
[  547.343394] option 1-1.1:1.0: GSM modem (1-port) converter detected
[  547.343578] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  547.343811] option 1-1.1:1.1: GSM modem (1-port) converter detected
[  547.343959] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  547.344209] option 1-1.1:1.2: GSM modem (1-port) converter detected
[  547.344358] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  547.344598] option 1-1.1:1.3: GSM modem (1-port) converter detected
[  547.344745] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  547.355025] qmi_wwan 1-1.1:1.4: cdc-wdm0: USB WDM device
[  547.355652] qmi_wwan 1-1.1:1.4 wwan0: register 'qmi_wwan' at usb-0000:01:00.0-1.1, WWAN/QMI device, 02:68:e8:df:43:8b
[  558.628755] usb 1-1.1: USB disconnect, device number 25
[  558.631831] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  558.632013] option 1-1.1:1.0: device disconnected
[  558.634483] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  558.634611] option 1-1.1:1.1: device disconnected
[  558.639666] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  558.639814] option 1-1.1:1.2: device disconnected
[  558.640791] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  558.640920] option 1-1.1:1.3: device disconnected
[  558.641364] qmi_wwan 1-1.1:1.4 wwan0: unregister 'qmi_wwan' usb-0000:01:00.0-1.1, WWAN/QMI device
[  562.865421] usb 1-1.1: new high-speed USB device number 26 using xhci_hcd
[  563.007289] usb 1-1.1: New USB device found, idVendor=2c7c, idProduct=0296, bcdDevice= 0.00
[  563.007312] usb 1-1.1: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[  563.007331] usb 1-1.1: Product: Qualcomm CDMA Technologies MSM
[  563.007348] usb 1-1.1: Manufacturer: Qualcomm, Incorporated
[  563.007365] usb 1-1.1: SerialNumber: 59920727
[  563.015625] option 1-1.1:1.0: GSM modem (1-port) converter detected
[  563.016028] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[  563.016593] option 1-1.1:1.1: GSM modem (1-port) converter detected
[  563.016953] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[  563.017501] option 1-1.1:1.2: GSM modem (1-port) converter detected
[  563.017880] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[  563.018471] option 1-1.1:1.3: GSM modem (1-port) converter detected
[  563.018815] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[  563.021226] qmi_wwan 1-1.1:1.4: cdc-wdm0: USB WDM device
[  563.022117] qmi_wwan 1-1.1:1.4 wwan0: register 'qmi_wwan' at usb-0000:01:00.0-1.1, WWAN/QMI device, 02:68:e8:df:43:8b
[  572.241025] usb 1-1.1: USB disconnect, device number 26
[  572.241961] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  572.242109] option 1-1.1:1.0: device disconnected
[  572.243043] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  572.243182] option 1-1.1:1.1: device disconnected
[  572.244190] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  572.244374] option 1-1.1:1.2: device disconnected
[  572.245542] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  572.245698] option 1-1.1:1.3: device disconnected
[  572.246278] qmi_wwan 1-1.1:1.4 wwan0: unregister 'qmi_wwan' usb-0000:01:00.0-1.1, WWAN/QMI device
2

I’m having the same problem - any resolution to this?

[ 1750.635509] usb 1-1.1: reset high-speed USB device number 19 using xhci_hcd
[ 1750.774061] option 1-1.1:1.0: GSM modem (1-port) converter detected
[ 1750.774247] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1750.775490] qmi_wwan 1-1.1:1.2: cdc-wdm0: USB WDM device
[ 1750.777489] qmi_wwan 1-1.1:1.2 wwan0: register ‘qmi_wwan’ at usb-0000:01:00.0-1.1, WWAN/QMI device, 5a:53:a2:a0:7d:ad
[ 1750.777643] option 1-1.1:1.3: GSM modem (1-port) converter detected
[ 1750.780981] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1750.781162] option 1-1.1:1.4: GSM modem (1-port) converter detected
[ 1750.781378] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1750.781533] option 1-1.1:1.5: GSM modem (1-port) converter detected
[ 1750.781704] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[ 1750.781845] option 1-1.1:1.6: GSM modem (1-port) converter detected
[ 1750.782027] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4
[ 1764.446196] usb 1-1.1: USB disconnect, device number 19
[ 1764.447083] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 1764.447226] option 1-1.1:1.0: device disconnected
[ 1764.447964] qmi_wwan 1-1.1:1.2 wwan0: unregister ‘qmi_wwan’ usb-0000:01:00.0-1.1, WWAN/QMI device
[ 1764.526073] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 1764.526219] option 1-1.1:1.3: device disconnected
[ 1764.527233] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 1764.527375] option 1-1.1:1.4: device disconnected
[ 1764.528336] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 1764.528475] option 1-1.1:1.5: device disconnected
[ 1764.529461] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 1764.529595] option 1-1.1:1.6: device disconnected
[ 1777.854875] usb 1-1.1: new high-speed USB device number 20 using xhci_hcd
[ 1777.997980] usb 1-1.1: New USB device found, idVendor=1bc7, idProduct=1201, bcdDevice= 3.18
[ 1777.998002] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1777.998020] usb 1-1.1: Product: LE910C4-NF
[ 1777.998038] usb 1-1.1: Manufacturer: Android
[ 1777.998055] usb 1-1.1: SerialNumber: 0123456789ABCDEF
[ 1778.012752] option 1-1.1:1.0: GSM modem (1-port) converter detected
[ 1778.013136] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1778.017681] qmi_wwan 1-1.1:1.2: cdc-wdm0: USB WDM device
[ 1778.019197] qmi_wwan 1-1.1:1.2 wwan0: register ‘qmi_wwan’ at usb-0000:01:00.0-1.1, WWAN/QMI device, 5a:53:a2:a0:7d:ad
[ 1778.019826] option 1-1.1:1.3: GSM modem (1-port) converter detected
[ 1778.020236] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1778.021011] option 1-1.1:1.4: GSM modem (1-port) converter detected
[ 1778.021507] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1778.022202] option 1-1.1:1.5: GSM modem (1-port) converter detected
[ 1778.022580] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
[ 1778.023249] option 1-1.1:1.6: GSM modem (1-port) converter detected
[ 1778.023639] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB4