Problems with Webcam and USB 3.X

Hans Petter Selasky hps at
Wed Apr 14 00:59:37 UTC 2021

On 4/14/21 2:49 AM, Nilton Jose Rizzo wrote:
> ugen1.3: <vendor 0x046d product 0x0825> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (500mA)


This webcam is connected VIA USB2.0 protocols only. No USB 3.x involved.

Unstable picture may indicate a bandwidth problem.

You can also compile webcamd with debugging and run it in the 
foreground. Then webcamd will likely print the UVC decoding glitches.

You may also try the following command to get more logs:

usbdump -i usbus1 -f 3

Then start for a few seconds till you get a picture:

pwcview -d /dev/video0 -s vga

Have you tried another webcam on the same machine?


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