Issue USB driver to Quectel modem


I am having some issue with a USB connection to a Quectel RM520 modem. I have a USB3 connection between the modem and a Habanero module, the connection starts up fine, the modem comes online, I can start a WAN on the Habanero so my laptop comes online through the LAN to the Habanero module.

Openwrt version: 19.07.2
RM520 version: RM520NGLAAR01A06M4G

The problem starts when I run a speedtest. When running a speedtest I get two error in the log.

  1. error:
kern.warn kernel: xhci-hcd ERROR unknown event type 37

The first error is printed in the log alot when the speedtest is running. I dont know if it is doing anything, or it can be ignored or it is associated with the second error.

  1. error:
[  414.023909] usb 2-1: USB disconnect, device number 2
[  414.024361] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  414.028359] option 2-1:1.0: device disconnected
[  414.037675] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  414.040238] qmi_wwan 2-1:1.4: nonzero urb status received: -71
[  414.040249] qmi_wwan 2-1:1.4: wdm_int_callback - 0 bytes
[  414.040257] qmi_wwan 2-1:1.4: wdm_int_callback - usb_submit_urb failed with result -19
[  414.060019] option 2-1:1.1: device disconnected
[  414.070577] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  414.072428] option 2-1:1.2: device disconnected
[  414.081844] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  414.084411] option 2-1:1.3: device disconnected

The second error is a lot more critical since it resets the USB connection to the modem. I have only seen it once and it looked like came when the speedtest reached around 200 Mbps.

I hope someone can help me fix this errors.

Dont hesitate to ask for more information.

could be a USB power issue, try a powered hub, if you've got one.

but i'd start by upgrading anyway, 19.07 is out of support.

Thanks for the reply.

I am working on our custom board, so I cant try and use a usb hub.

Unfortunately, we are running some custom software, which is very closely related to version 19.07, but we might need to spent the time to upgrade it, so it can run on a newer version.

Do you know if it is possible to disable the first error? since it is printed a lot in log, and that is annoying.

for #1 see Error: unknown event type 37?

1 Like