OAK-D-S2 slow USB speed

johnmcd

I have two oak-d-s2 cameras; one which is a year old and one which I just purchased. On connecting the new camera I noticed that it was running very laggy / slow.

After a bit of digging it seems that the new camera is connecting a lower usb speed to the older one. The following is the output from the oak_bandwidth_test.py utility showing the difference in speeds between the two cameras:

(venv) john@JMCD-L7400:~/Luxonis/depthai-experiments/random-scripts$ python3 oak_bandwidth_test.py 
Downlink 337.9 mbps
Uplink 303.1 mbps
Press any key to continue...
(venv) john@JMCD-L7400:~/Luxonis/depthai-experiments/random-scripts$ python3 oak_bandwidth_test.py 
Downlink 2905.0 mbps
Uplink 2207.2 mbps
Press any key to continue...

I have also run device_manager.py which shows that the older camera has a USB max speed of "SUPER" whereas the newer camera's max speed is reported as "HIGH".

I have tried factory resetting and reflashing the factory bootloader on the off-chance that that might rectify the situation but this has not had any obvious effect.

Does this look like a hardware fault or are there any other suggestions people might have before escalating to support?

Thanks for your help.

jakaskerl

johnmcd
Did you try switching the cables? And USB ports?

Thanks,
Jaka

johnmcd

Yes, however the cable and port should be ok since the second oak-d-s2 works fine on the cable and port. The behaviour is evident on a dev pc and a raspi.

John.

jakaskerl

johnmcd
Do you have any other USB3 capable cables available to test. I have never seen this issue before, it was always the cable or the port, that's why I ask.

Thanks,
Jaka