> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 使用用户空间日志调试

在设备上通过 SSH 使用以下日志调试用户空间问题。

## **生成 syslog**

* 要验证设备是否生成 syslog,请运行以下命令:
  > ```text theme={null}
  > cat /var/log/user.log
  > ```
* 如果设备未生成 syslog,请运行以下命令:
  > ```text theme={null}
  > tail -f /var/log/messages
  > ```
  >
  > **示例日志:**
  >
  > Apr 28 17:42:30 qcm6490 [daemon.info](http://daemon.info) avahi-daemon\[516]: No service file found in /etc/avahi/services.
  >
  > Apr 28 17:42:30 qcm6490 [daemon.info](http://daemon.info) avahi-daemon\[516]: Joining mDNS multicast group on interface lo.IPv6 with address ::1.
  >
  > Apr 28 17:42:30 qcm6490 [daemon.info](http://daemon.info) avahi-daemon\[516]: New relevant interface lo.IPv6 for mDNS.
  >
  > Apr 28 17:42:30 qcm6490 [daemon.info](http://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](http://daemon.info) avahi-daemon\[516]: New relevant interface lo.IPv4 for mDNS.

## **生成 journalctl 日志**

* 要查看系统 journalctl 日志,请运行以下命令:
  > ```text theme={null}
  > journalctl -ef
  > ```
  >
  > **示例日志:**
  >
  > 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.