This on a Pi4B Running Buster
Actually there are two Pi4Bs hosting identical USB cameras. They are both in a location that I only visit for a few days each month. I can log in remotely. Both are using Raspberry Pi power supplies.
On one Pi the camera is listed via lsusb:
On the other it is MIA:
It's still there and it still works:
But, it does drop off the bus now and then causing a watchdog reboot if the camera fails to grab an image after three minutes. These are log entries made by the watchdog repair script:
I have two questions:
• Why does the one camera not show up in lsusb?
• Is there anything I can do to stop the one camera from dropping off the USB bus?
Actually there are two Pi4Bs hosting identical USB cameras. They are both in a location that I only visit for a few days each month. I can log in remotely. Both are using Raspberry Pi power supplies.
On one Pi the camera is listed via lsusb:
Code:
pi@raspcondo:~/webcam $ lsusbBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 003: ID 05a3:9230 ARC International CameraBus 001 Device 002: ID 2109:3431 VIA Labs, Inc. HubBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubCode:
pi@raspmountain:~/webcam $ lsusbBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 004: ID 051d:0002 American Power Conversion Uninterruptible Power SupplyBus 001 Device 003: ID 32e4:9230Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. HubBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubCode:
--- Opening /dev/v4l/by-id/usb-HD_USB_Camera_HD_USB_Camera-video-index0...Trying source module v4l2.../dev/v4l/by-id/usb-HD_USB_Camera_HD_USB_Camera-video-index0 opened.No input was specified, using the first.--- Capturing 10 frames...Skipping 50 frames...Capturing 10 frames...Captured 60 frames in 2.79 seconds. (21 fps)--- Processing captured image...Disabling banner.Setting output format to WEBP, quality 100Writing WEBP image to '/home/pi/webcam/webcammtn.webp'.Code:
Sat Oct 11 19:53:07 +07 2025 Watchdog checkBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 004: ID 051d:0002 American Power Conversion Uninterruptible Power SupplyBus 001 Device 003: ID 32e4:9230Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. HubBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubSat Oct 11 19:53:32 +07 2025 Raspmountain Reboot• Why does the one camera not show up in lsusb?
• Is there anything I can do to stop the one camera from dropping off the USB bus?
Statistics: Posted by Ratsima — Sat Oct 11, 2025 10:32 pm