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Use the following logs to debug user-space issues through SSH on the device.

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Generate syslogs

  • To verify whether the device generates syslogs, run the following command: 
    cat /var/log/user.log
  • If the device doesn’t generate syslogs, run the following command: 
    tail -f /var/log/messages
    Sample log: Apr 28 17:42:30 qcm6490 daemon.info avahi-daemon[516]: No service file found in /etc/avahi/services. Apr 28 17:42:30 qcm6490 daemon.info avahi-daemon[516]: Joining mDNS multicast group on interface lo.IPv6 with address ::1. Apr 28 17:42:30 qcm6490 daemon.info avahi-daemon[516]: New relevant interface lo.IPv6 for mDNS. Apr 28 17:42:30 qcm6490 daemon.info avahi-daemon[516]: Joining mDNS multicast group on interface lo.IPv4 with address 127.0.0.1. Apr 28 17:42:30 qcm6490 daemon.info avahi-daemon[516]: New relevant interface lo.IPv4 for mDNS.

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Generate journalctl logs

  • To view the system journalctl logs, run the following command: 
    journalctl -ef
    Sample log: Apr 28 17:42:28 qcm6490 kernel: spmi-temp-alarm c440000.spmi:pmic@2:temp-alarm@2400: error -ENXIO: IRQ index 0 not found Apr 28 17:42:28 qcm6490 kernel: qcom-spmi-adc5 c440000.spmi:pmic@2:adc@3100: Invalid dig version read -19 Apr 28 17:42:28 qcm6490 kernel: qcom-spmi-adc5 c440000.spmi:pmic@2:adc@3100: error -ENODEV: adc get dt data failed Apr 28 17:42:28 qcm6490 kernel: qcom-spmi-adc5 c440000.spmi:pmic@0:adc@3100: error -EINVAL: adc get dt data failed Apr 28 17:42:28 qcm6490 kernel: qcom-spmi-adc5: probe of c440000.spmi:pmic@0:adc@3100 failed with error -22 Apr 28 17:42:28 qcm6490 kernel: dwc3 a600000.usb: Adding to iommu group Apr 28 17:42:29 qcm6490 systemd[1]: First Boot Complete was skipped because of a failed condition check (ConditionFirstBoot=yes). Apr 28 17:42:29 qcm6490 systemd[1]: Reached target Hardware activated USB gadget.