The following commands can be used to isolate and analyze issues:
To Retrieve the Kernel Version use:
$ uname -r
To change the log level of LibRealSense logger, you need to set a local variable named LRS_LOG_LEVEL and initialize it with the desirable log level:
$ export LRS_LOG_LEVEL="<Log Level>"
$ set LRS_LOG_LEVEL="<Log Level>"
A LibRealSense log will be created even when an application does not activate the LibRealSense logger.
To list all connected Intel Cameras:
$ lsusb | grep 8086
To retrieve the last Linux Kernel log messages with timestamps:
$ dmesg -T
To clear the dmesg buffer:
$ sudo dmesg -c
Linux writes all OS logs to
To review the entire kernel log file, use:
$ less /var/log/kern.log
You can get more verbose logs from the uvcvideo kernel-module.
These logs can be seen in
To enable the UVC driver verbose log:
$ sudo echo 0xFFFF > /sys/module/uvcvideo/parameters/trace
To disable the UVC verbose log, replace 0xFFFF with 0.
For example, once enabled you will get the following line inside
dmesg for each frame received from USB:
[619003.810541] uvcvideo: frame 1 stats: 0/0/1 packets, 0/0/1 pts (!early initial), 0/1 scr, last pts/stc/sof 25177741/25178007/81 [619003.810546] uvcvideo: Frame complete (FID bit toggled). [619003.810556] uvcvideo: frame 2 stats: 0/0/1 packets, 0/0/1 pts (!early initial), 0/1 scr, last pts/stc/sof 25210903/25211168/346 [619003.810588] uvcvideo: uvc_v4l2_poll [619003.811173] uvcvideo: uvc_v4l2_poll [619003.843768] uvcvideo: frame 3 stats: 0/0/1 packets, 0/0/1 pts (!early initial), 0/1 scr, last pts/stc/sof 25210903/25211168/346 [619003.843774] uvcvideo: Frame complete (FID bit toggled). [619003.843785] uvcvideo: frame 4 stats: 0/0/1 packets, 0/0/1 pts (!early initial), 0/1 scr, last pts/stc/sof 25244064/25244330/612
To listen to camera connect/disconnect events:
$ sudo udevadm monitor
To get a verbose log of all calls an application makes to the kernel, run the application under
$ strace <Application Path>
In case of a crash (for example SEGFAULT), a snapshot of the crash can be created (Core Dump) and submitted for inspection.
- Enable the auto-creation of Core Dump files:
$ ulimit -c unlimited
Run the application that causes the crash
Search for the
corefile in the current directory
Auto-creation of the dump file will only work on the same Terminal that you ran the ulimit command.
Updated almost 4 years ago