On Fri, 24 Jan 2020, JH wrote: > Hi, > > I am running kernel 4.19.75 on iMX6 with a uBlox SARA-R4 LTE modem, > the modem manager is oFono, connect manager is connman. It could > connect to LTE between half hours to hours, then it dropped LTE > connection randomly, here are error messages, what could cause the > qmi_wwan status received: -71 and qmi_wwan usb_submit_urb failed with > result -19 errors? The most likely cause is that the modem's firmware crashed, or it disconnected itself electronically from the USB bus. Or else somebody unplugged the USB cable. Alan Stern > > [ 1018.944840] usb 1-1: USB disconnect, device number 2 > [ 1019.072845] option1 ttyUSB0: GSM modem (1-port) converter now > disconnected from ttyUSB0 > [ 1019.130834] option 1-1:1.0: device disconnected > [ 1019.142012] qmi_wwan 1-1:1.3: nonzero urb status received: -71 > [ 1019.147909] qmi_wwan 1-1:1.3: wdm_int_callback - 0 bytes > [ 1019.153254] qmi_wwan 1-1:1.3: wdm_int_callback - usb_submit_urb > failed with result -19 > [ 1019.228197] option1 ttyUSB1: GSM modem (1-port) converter now > disconnected from ttyUSB1 > [ 1019.274475] option 1-1:1.2: device disconnected > [ 1019.340442] qmi_wwan 1-1:1.3 wwan0: unregister 'qmi_wwan' > usb-ci_hdrc.1-1, WWAN/QMI device > [ 1022.827992] usb 1-1: new high-speed USB device number 3 using ci_hdrc > [ 1023.057165] option 1-1:1.0: GSM modem (1-port) converter detected > [ 1023.097815] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0 > [ 1023.157293] option 1-1:1.2: GSM modem (1-port) converter detected > [ 1023.178163] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1 > [ 1023.201251] qmi_wwan 1-1:1.3: cdc-wdm0: USB WDM device > [ 1023.243783] qmi_wwan 1-1:1.3 wwan0: register 'qmi_wwan' at > usb-ci_hdrc.1-1, WWAN/QMI device, 16:ed:38:aa:c5:90 > > Thank you. > > Kind regards, > > - jh
