[gentoo-user] U.V.C. Webcam Disconnects shortly after Registration

[Ashley Dixon]

How's it going dudes?

I bought a Logitech C270 webcam from Argos about a year ago, which, according to
the LKDDb [1] and U.V.C. driver website [2], should work well on Linux.  Despite
working flawlessly until recently, some strange behaviour has appeared.

When I connect the webcam, `dmesg` registers it as would be expected (timestamps
omitted):

        usb 3-7: new high-speed USB device number 14 using xhci_hcd
        usb 3-7: New USB device found, idVendor=046d, idProduct=0825, bcdDevice= 0.12
        usb 3-7: New USB device strings: Mfr=0, Product=0, SerialNumber=2
        usb 3-7: SerialNumber: 9EEFE4E0
        uvcvideo: Found UVC 1.00 device <unnamed> (046d:0825)
        input: UVC Camera (046d:0825) as /devices/pci0000:00/0000:00:14.0/usb3/3-7/3-7:1.0/input/input27
        usb 3-7: set resolution quirk: cval->res = 384

However, about two seconds later, me having done nothing, the kernel ring buffer
suggests it has been physically unplugs, and thus deregisters the device...

        USB disconnect, device number 14

I have tested this on another very similar machine, and this problem is  not  to
be seen, and everything works perfectly; thus ruling out a hardware  issue  with
the camera.  Furthermore, no other devices---even other U.V.C.  webcams---do not
present with the same symptoms on my machine, in the  same  U.S.B.   port;  thus
ruling out any issue with the physical port or motherboard controller.

I have no idea how to triage this further.  I feel like my head has been  nailed
to a coffee table by Dinsdale Piranha.  Any tips?   My  kernel  is  5.9.13-zen1,
although this trouble presents identically on a vanilla kernel.

Cheers.

Hope everyone is remaining well.

[1] https://linux-hardware.org/index.php?id=usb:046d-0825
[2] https://www.ideasonboard.org/uvc/#devices

-- 

Ashley Dixon
suugaku.co.uk

2A9A 4117
DA96 D18A
8A7B B0D2
A30E BF25
F290 A8AA