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#1 2022-11-21 23:14:43

Registered: 2015-02-17
Posts: 2

Webcam Issues


I have a webcam which worked on a previous installation of Manjaro, but I cannot get to work on my new installation of Arch.

The issue: cannot get video output in any application. Some applications (like Cheese and qv4l2) show errors timing out for getting properties like saturation, others (like qv4l2) just say "input/output error".

Steps I have taken:

- Followed the wiki suggestions
- Made sure my user is in the video group
- Unplug, plug the hardware
- Rebooting after ensuring all relevant kernel modules (e.g. uvcvideo) are loaded

Here is the relevant output from dmesg when I plug in the webcam:

[ 1314.099447] usb 1-3.2.2: new high-speed USB device number 9 using xhci_hcd
[ 1314.408606] usb 1-3.2.2: New USB device found, idVendor=046d, idProduct=0825, bcdDevice= 0.12
[ 1314.408611] usb 1-3.2.2: New USB device strings: Mfr=0, Product=0, SerialNumber=2
[ 1314.408613] usb 1-3.2.2: SerialNumber: 6FECC7D0
[ 1314.468377] usb 1-3.2.2: Found UVC 1.00 device <unnamed> (046d:0825)
[ 1314.583344] input: UVC Camera (046d:0825) as /devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:08.0/0000:07:00.1/usb1/1-3/1-3.2/1-3.2.2/1-3.2.2:1.0/input/input26
[ 1316.132743] usb 1-3.2.2: set resolution quirk: cval->res = 384

Here is the output from

v4l2-ctl -d /dev/video1 --all


Driver Info:
	Driver name      : uvcvideo
	Card type        : UVC Camera (046d:0825)
	Bus info         : usb-0000:07:00.1-3.2.2
	Driver version   : 6.0.9
	Capabilities     : 0x84a00001
		Video Capture
		Metadata Capture
		Extended Pix Format
		Device Capabilities
	Device Caps      : 0x04200001
		Video Capture
		Extended Pix Format
Media Driver Info:
	Driver name      : uvcvideo
	Model            : UVC Camera (046d:0825)
	Serial           : 6FECC7D0
	Bus info         : usb-0000:07:00.1-3.2.2
	Media version    : 6.0.9
	Hardware revision: 0x00000012 (18)
	Driver version   : 6.0.9
Interface Info:
	ID               : 0x03000002
	Type             : V4L Video
Entity Info:
	ID               : 0x00000001 (1)
	Name             : UVC Camera (046d:0825)
	Function         : V4L2 I/O
	Flags            : default
	Pad 0x01000007   : 0: Sink
	  Link 0x02000019: from remote pad 0x100000a of entity 'Extension 4' (Video Pixel Formatter): Data, Enabled, Immutable
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
	Width/Height      : 640/480
	Pixel Format      : 'YUYV' (YUYV 4:2:2)
	Field             : None
	Bytes per Line    : 1280
	Size Image        : 614400
	Colorspace        : sRGB
	Transfer Function : Rec. 709
	YCbCr/HSV Encoding: ITU-R 601
	Quantization      : Default (maps to Limited Range)
	Flags             :
Crop Capability Video Capture:
	Bounds      : Left 0, Top 0, Width 640, Height 480
	Default     : Left 0, Top 0, Width 640, Height 480
	Pixel Aspect: 1/1
Selection Video Capture: crop_default, Left 0, Top 0, Width 640, Height 480, Flags:
Selection Video Capture: crop_bounds, Left 0, Top 0, Width 640, Height 480, Flags:
Streaming Parameters Video Capture:
	Capabilities     : timeperframe
	Frames per second: 30.000 (30/1)
	Read buffers     : 0

User Controls

                     brightness 0x00980900 (int)    : min=0 max=255 step=1 default=128 value=128
                       contrast 0x00980901 (int)    : min=0 max=255 step=1 default=32 value=32
                     saturation 0x00980902 (int)    : min=0 max=255 step=1 default=32 value=32
        white_balance_automatic 0x0098090c (bool)   : default=1 value=1
                           gain 0x00980913 (int)    : min=0 max=255 step=1 default=64 value=64
           power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=2 value=2 (60 Hz)
				0: Disabled
				1: 50 Hz
				2: 60 Hz
      white_balance_temperature 0x0098091a (int)    : min=0 max=10000 step=10 default=4000 value=4000 flags=inactive
                      sharpness 0x0098091b (int)    : min=0 max=255 step=1 default=24 value=24
         backlight_compensation 0x0098091c (int)    : min=0 max=1 step=1 default=0 value=0

Camera Controls

                  auto_exposure 0x009a0901 (menu)   : min=0 max=3 default=3 value=3 (Aperture Priority Mode)
				1: Manual Mode
				3: Aperture Priority Mode
         exposure_time_absolute 0x009a0902 (int)    : min=1 max=10000 step=1 default=166 value=166 flags=inactive
     exposure_dynamic_framerate 0x009a0903 (bool)   : default=0 value=1

This is the terminal output from launching cheese (once, I get different errors on different invocations):

(cheese:29425): cheese-WARNING **: 15:13:30.813: Internal data stream error.: ../gstreamer/subprojects/gstreamer/libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin36/GstPipeWireSrc:pipewiresrc2:
streaming stopped, reason not-negotiated (-4)

This is the terminal output from using qv4l2 and setting the pixel format:

Error Sharpness (24): Connection timed out
libv4l2: error setting pixformat: Input/output error

I'm not sure how to debug this further, any advice would be welcome.


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