I have a USB camera which used to work just fine, as plug-and-play, on my Ubuntu (current version 18.04.4 LTS, Linux E480 4.15.0-88-generic #88-Ubuntu SMP). Now, for some months it hasn't detected.
After plugging the camera in, the tail of dmesg gives
[ 5862.596999] usb 1-3: new high-speed USB device number 15 using xhci_hcd [ 5862.798746] usb 1-3: config 1 interface 1 altsetting 0 endpoint 0x82 has wMaxPacketSize 0, skipping [ 5862.799144] usb 1-3: New USB device found, idVendor=1742, idProduct=0307 [ 5862.799149] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 5862.799154] usb 1-3: Product: NCM03-V-02 [ 5862.799157] usb 1-3: Manufacturer: Nippon Chemi-Con Corporation [ 5862.800479] uvcvideo: Found UVC 1.00 device NCM03-V-02 (1742:0307) [ 5862.800516] uvcvideo: No streaming interface found for terminal 2. [ 5862.800524] uvcvideo 1-3:1.0: Entity type for entity Extension 4 was not initialized! [ 5862.800531] uvcvideo 1-3:1.0: Entity type for entity Processing 3 was not initialized! [ 5862.800535] uvcvideo 1-3:1.0: Entity type for entity Camera 1 was not initialized! [ 5862.801081] input: NCM03-V-02 as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/input/input25
and lsusb shows this entry:
Bus 001 Device 015: ID 1742:0307
and lsusb -t these (under Bus 01):
|__ Port 3: Dev 15, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 3: Dev 15, If 1, Class=Video, Driver=, 480M
However, the camera is not listed in
/dev/v4l/* and hence not in
v4l2-ctl --list-devices doesn't show the camera.
I have tried to solve this by, e.g., re-installing v4l-utils and re-adding the modules uvcvideo and xhci_hcd.
I presume the messages "No streaming interface found for terminal" and "entity X was not initialized!" are not a good sign but Internet searches didn't help me.
I have a dual-boot (Linux / Windows) and the camera works on Windows.