[linux-uvc-devel] Larmtek camera issue

[Paul J. <pa...@te...>]

Good morning!

First of all, I should point out that I have searched across the 
internet for others with this issue, but to no avail.

I have a LarmTek camera USB Webcam 1080P - this is the link: 
www.amazon.co.uk/gp/product/B07VTPQ9NQ

It worked under both Linux and Windows 10 (dual-booted - I need the 
latter for work from home) from the time I bought it until recently. It 
is permanently plugged into my desktop computer.

I started the zoom client yesterday, and was greeted by a blank screen. 
The camera active light comes on, but no picture is available in the client.

If I reboot the computer, then plug the camera in I get the following:

---------------------8<--------------------------

Nov  4 09:42:38 tristan kernel: usb 1-1: new high-speed USB device 
number 5 using xhci_hcd
Nov  4 09:42:38 tristan kernel: usb 1-1: New USB device found, 
idVendor=0525, idProduct=a4a2, bcdDevice=30.00
Nov  4 09:42:38 tristan kernel: usb 1-1: New USB device strings: Mfr=1, 
Product=2, SerialNumber=3
Nov  4 09:42:38 tristan kernel: usb 1-1: Product: HiEthernet
Nov  4 09:42:38 tristan kernel: usb 1-1: Manufacturer: Huawei
Nov  4 09:42:38 tristan kernel: usb 1-1: SerialNumber: 1234567891
Nov  4 09:42:42 tristan kernel: usb 1-1: USB disconnect, device number 5
Nov  4 09:42:43 tristan kernel: usb 1-1: new high-speed USB device 
number 6 using xhci_hcd
Nov  4 09:42:44 tristan kernel: usb 1-1: New USB device found, 
idVendor=12d1, idProduct=4321, bcdDevice= 4.09
Nov  4 09:42:44 tristan kernel: usb 1-1: New USB device strings: Mfr=1, 
Product=2, SerialNumber=3
Nov  4 09:42:44 tristan kernel: usb 1-1: Product: UVC Camera
Nov  4 09:42:44 tristan kernel: usb 1-1: Manufacturer: Ruision
Nov  4 09:42:44 tristan kernel: usb 1-1: SerialNumber: 20200416
Nov  4 09:42:44 tristan kernel: usb 1-1: Found UVC 1.10 device UVC 
Camera (12d1:4321)
Nov  4 09:42:44 tristan kernel: usb 1-1: Failed to query (GET_INFO) UVC 
control 12 on unit 2: -32 (exp. 1).
Nov  4 09:42:44 tristan kernel: input: UVC Camera: UVC Camera as 
/devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:08.0/0000:06:00.1/usb1/1-1/1-1:1.0/input/input23

---------------------8<--------------------------

uname -a gives:

Linux tristan 5.14.15-gentoo #2 SMP Thu Nov 4 09:38:46 GMT 2021 x86_64 
AMD Ryzen 9 3950X 16-Core Processor AuthenticAMD GNU/Linux

- The system runs gentoo, and is up to date.
- I am using OpenRC, not systemd, and for sound I am using pulseaudio 
(in case that is relevant).
- I still have kernel images in my boot directory for 5.13.8, 5.14.6 and 
5.14.9. All of these kernels have the same result.
- I don't see any other error messages in my logs
- The camera continues to work under Windows 10, so I don't believe it 
is a hardware issue.

Please can you advise me how I can debug this issue? Unfortunately I am 
not a heavy user of the camera, so I can't pinpoint exactly when the 
problem started.

Many thanks for your continued development of the code to manage these 
devices, and for supporting me with this issue.

-- 
Paul