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Message-ID: <9c7646d0-2879-4a90-a176-3aa1714c3294@gmail.com>
Date: Tue, 18 Nov 2025 17:02:19 +0000
From: vanquestor <vanquestor@...il.com>
To: linux-kernel@...r.kernel.org
Subject: UVC USB Camera capture button fails on upgrade
I have a low-cost, UVC compliant dental realtek camera (id 0bda:5841)
with an "onboard" capture button which has proved invaluable for
capturing medical images of oral lesions, the examination of which often
requires both hands (one to hold the camera and one for examination
instruments) leaving the keyboard capture option "out of reach".
Since an upgrade from opensuse 15.5 (Kernel 5.14.21-150500.55.88-default
(64-bit)) to Opensuse 15.6 (Kernel 6.4.0-150600.23.73-default (64-bit))
this vital capture button no longer works.
After pugging the camera into the Kernel 5.1.21 kernel machine (and
starting a guvcview to initiate /dev/video0 & dev/video1) udev creates
an event entry under /dev/input/event16 based upon the hardware
enumeration under /sys/bus/pci/devices/...../input/input18/event16. This
makes the button available as a keyboard shortcut "webcam" that can be
assigned to capture images.
After plugging the same camera into the Kernel 6.4.0 machine the camera
works well but no such enumeration of the input button appears and it
fails to work.
As a linux amateur I am confused as to where to report this. I recognise
that both systems report the same version 1.1.1 of uvcvideo.ko.zst
suggesting that it is not the "culprit" here but in trying to find a
solution (through udev rules etc) I read that:
"The function uvc_input_has_button is used within the Linux kernel's UVC
(USB Video Class) driver to determine whether a UVC device supports
reporting camera button events through an input
device. This function checks the device's capabilities, specifically
whether the bTriggerSupport and bTriggerUsage fields are set to one,
which indicates hardware support for triggering events via a button. If
these conditions are met, the function returns true, allowing the
creation of an input device to report button presses and releases.
This functionality is controlled by the kernel configuration option
CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV, which enables the registration of an
input device for UVC devices to report button
events. The input device is created only if the hardware supports it,
and button events are reported through a separate event device node,
though the video device node must be open for this to function."
I checked the Opensuse kernel source which suggest that
CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV is indeed set = y leading me back to
thinking that the driver / kernel interaction is at issue here.
Hence I address the question to your mailing address first in the hope
you can suggest how to restore very useful functionality for which I
would be most appreciative (as I am for the driver in the first place).
Kind regards
JohnH
For your info the tail of dmesg reports:
[ 2854.354875] usb 1-1.3: new high-speed USB device number 5 using ehci-pci
[ 2854.490767] usb 1-1.3: New USB device found, idVendor=0bda,
idProduct=5841, bcdDevice= 0.01
[ 2854.490776] usb 1-1.3: New USB device strings: Mfr=3, Product=1,
SerialNumber=2
[ 2854.490779] usb 1-1.3: Product: USB Camera
[ 2854.490782] usb 1-1.3: Manufacturer: Generic
[ 2854.490784] usb 1-1.3: SerialNumber: 200901010001
[ 2854.492759] usb 1-1.3: Found UVC 1.00 device USB Camera (0bda:5841)
lsusb.log reports
Bus 001 Device 007: ID 0bda:5841 Realtek Semiconductor Corp. USB Camera
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x0bda Realtek Semiconductor Corp.
idProduct 0x5841
bcdDevice 0.01
iManufacturer 3 Generic
iProduct 1 USB Camera
iSerial 2 200901010001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x03ba
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 4 USB Camera
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 14 Video
bFunctionSubClass 3 Video Interface Collection
bFunctionProtocol 0
iFunction 5 USB Camera
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 1 Video Control
bInterfaceProtocol 0
iInterface 5 USB Camera
VideoControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdUVC 1.00
wTotalLength 0x004e
dwClockFrequency 15.000000MHz
bInCollection 1
baInterfaceNr( 0) 1
VideoControl Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0201 Camera Sensor
bAssocTerminal 0
iTerminal 0
wObjectiveFocalLengthMin 0
wObjectiveFocalLengthMax 0
wOcularFocalLength 0
bControlSize 3
bmControls 0x00002a0a
Auto-Exposure Mode
Exposure Time (Absolute)
Zoom (Absolute)
PanTilt (Absolute)
Roll (Absolute)
VideoControl Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 5 (PROCESSING_UNIT)
Warning: Descriptor too short
bUnitID 2
bSourceID 1
wMaxMultiplier 0
bControlSize 2
bmControls 0x0000157f
Brightness
Contrast
Hue
Saturation
Sharpness
Gamma
White Balance Temperature
Backlight Compensation
Power Line Frequency
White Balance Temperature, Auto
iProcessing 0
bmVideoStandards 0x09
None
SECAM - 625/50
VideoControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 4
iTerminal 0
VideoControl Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 4
guidExtensionCode {1229a78c-47b4-4094-b0ce-db07386fb938}
bNumControls 2
bNrInPins 1
baSourceID( 0) 2
bControlSize 2
bmControls( 0) 0x00
bmControls( 1) 0x06
iExtension 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0010 1x 16 bytes
bInterval 6
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
VideoStreaming Interface Descriptor:
bLength 15
bDescriptorType 36
bDescriptorSubtype 1 (INPUT_HEADER)
bNumFormats 2
wTotalLength 0x02cd
bEndpointAddress 0x81 EP 1 IN
bmInfo 0
bTerminalLink 3
bStillCaptureMethod 2
bTriggerSupport 1
bTriggerUsage 0
bControlSize 1
bmaControls( 0) 0
bmaControls( 1) 0
VideoStreaming Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 6 (FORMAT_MJPEG)
bFormatIndex 1
bNumFrameDescriptors 10
bFlags 1
Fixed-size samples: Yes
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 1 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 1
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 480
dwMinBitRate 147456000
dwMaxBitRate 147456000
dwMaxVideoFrameBufferSize 614400
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 2
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 360
dwMinBitRate 110592000
dwMaxBitRate 110592000
dwMaxVideoFrameBufferSize 460800
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 3
bmCapabilities 0x00
Still image unsupported
wWidth 352
wHeight 288
dwMinBitRate 48660480
dwMaxBitRate 48660480
dwMaxVideoFrameBufferSize 202752
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 4
bmCapabilities 0x00
Still image unsupported
wWidth 320
wHeight 240
dwMinBitRate 36864000
dwMaxBitRate 36864000
dwMaxVideoFrameBufferSize 153600
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 5
bmCapabilities 0x00
Still image unsupported
wWidth 176
wHeight 144
dwMinBitRate 12165120
dwMaxBitRate 12165120
dwMaxVideoFrameBufferSize 50688
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 6
bmCapabilities 0x00
Still image unsupported
wWidth 160
wHeight 120
dwMinBitRate 9216000
dwMaxBitRate 9216000
dwMaxVideoFrameBufferSize 38400
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 7
bmCapabilities 0x00
Still image unsupported
wWidth 800
wHeight 600
dwMinBitRate 230400000
dwMaxBitRate 230400000
dwMaxVideoFrameBufferSize 960000
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 8
bmCapabilities 0x00
Still image unsupported
wWidth 1280
wHeight 720
dwMinBitRate 442368000
dwMaxBitRate 442368000
dwMaxVideoFrameBufferSize 1843200
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 9
bmCapabilities 0x00
Still image unsupported
wWidth 1280
wHeight 960
dwMinBitRate 589824000
dwMaxBitRate 589824000
dwMaxVideoFrameBufferSize 2457600
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 10
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 480
dwMinBitRate 147456000
dwMaxBitRate 147456000
dwMaxVideoFrameBufferSize 614400
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 26
bDescriptorType 36
bDescriptorSubtype 3 (STILL_IMAGE_FRAME)
bEndpointAddress 0x00 EP 0 OUT
bNumImageSizePatterns 5
wWidth( 0) 640
wHeight( 0) 480
wWidth( 1) 640
wHeight( 1) 360
wWidth( 2) 320
wHeight( 2) 240
wWidth( 3) 1280
wHeight( 3) 720
wWidth( 4) 1280
wHeight( 4) 960
bNumCompressionPatterns 0
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 2
bNumFrameDescriptors 10
guidFormat {32595559-0000-0010-8000-00aa00389b71}
bBitsPerPixel 16
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 2 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 480
dwMinBitRate 147456000
dwMaxBitRate 147456000
dwMaxVideoFrameBufferSize 614400
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 2
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 360
dwMinBitRate 110592000
dwMaxBitRate 110592000
dwMaxVideoFrameBufferSize 460800
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 3
bmCapabilities 0x00
Still image unsupported
wWidth 352
wHeight 288
dwMinBitRate 48660480
dwMaxBitRate 48660480
dwMaxVideoFrameBufferSize 202752
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 4
bmCapabilities 0x00
Still image unsupported
wWidth 320
wHeight 240
dwMinBitRate 36864000
dwMaxBitRate 36864000
dwMaxVideoFrameBufferSize 153600
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 5
bmCapabilities 0x00
Still image unsupported
wWidth 176
wHeight 144
dwMinBitRate 12165120
dwMaxBitRate 12165120
dwMaxVideoFrameBufferSize 50688
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 6
bmCapabilities 0x00
Still image unsupported
wWidth 160
wHeight 120
dwMinBitRate 9216000
dwMaxBitRate 9216000
dwMaxVideoFrameBufferSize 38400
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 7
bmCapabilities 0x00
Still image unsupported
wWidth 800
wHeight 600
dwMinBitRate 38400000
dwMaxBitRate 38400000
dwMaxVideoFrameBufferSize 960000
dwDefaultFrameInterval 2000000
bFrameIntervalType 1
dwFrameInterval( 0) 2000000
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 8
bmCapabilities 0x00
Still image unsupported
wWidth 1280
wHeight 720
dwMinBitRate 73728000
dwMaxBitRate 73728000
dwMaxVideoFrameBufferSize 1843200
dwDefaultFrameInterval 2000000
bFrameIntervalType 1
dwFrameInterval( 0) 2000000
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 9
bmCapabilities 0x00
Still image unsupported
wWidth 1280
wHeight 960
dwMinBitRate 98304000
dwMaxBitRate 98304000
dwMaxVideoFrameBufferSize 2457600
dwDefaultFrameInterval 2000000
bFrameIntervalType 1
dwFrameInterval( 0) 2000000
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 10
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 480
dwMinBitRate 147456000
dwMaxBitRate 147456000
dwMaxVideoFrameBufferSize 614400
dwDefaultFrameInterval 333333
bFrameIntervalType 1
dwFrameInterval( 0) 333333
VideoStreaming Interface Descriptor:
bLength 26
bDescriptorType 36
bDescriptorSubtype 3 (STILL_IMAGE_FRAME)
bEndpointAddress 0x00 EP 0 OUT
bNumImageSizePatterns 5
wWidth( 0) 640
wHeight( 0) 480
wWidth( 1) 640
wHeight( 1) 360
wWidth( 2) 320
wHeight( 2) 240
wWidth( 3) 1280
wHeight( 3) 720
wWidth( 4) 1280
wHeight( 4) 960
bNumCompressionPatterns 0
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0080 1x 128 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 3
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 4
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0b00 2x 768 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 5
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0c00 2x 1024 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 6
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x1380 3x 896 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 7
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x1400 3x 1024 bytes
bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
================================================================
udevadm info reports UNDER Kernel 5.14 with working event button
================================================================
For the parent camera device reports:
-------------------------------------
P: /devices/pci0000:00/0000:00:14.0/usb1/1-8
N: bus/usb/001/009
L: 0
E: DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-8
E: DEVNAME=/dev/bus/usb/001/009
E: DEVTYPE=usb_device
E: DRIVER=usb
E: PRODUCT=bda/5841/1
E: TYPE=239/2/1
E: BUSNUM=001
E: DEVNUM=009
E: MAJOR=189
E: MINOR=8
E: SUBSYSTEM=usb
E: USEC_INITIALIZED=9014821503
E: ID_VENDOR=Generic
E: ID_VENDOR_ENC=Generic
E: ID_VENDOR_ID=0bda
E: ID_MODEL=USB_Camera
E: ID_MODEL_ENC=USB\x20Camera
E: ID_MODEL_ID=5841
E: ID_REVISION=0001
E: ID_SERIAL=Generic_USB_Camera_200901010001
E: ID_SERIAL_SHORT=200901010001
E: ID_BUS=usb
E: ID_USB_INTERFACES=:0e0100:0e0200:
E: ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.
E: ID_PATH=pci-0000:00:14.0-usb-0:8
E: ID_PATH_TAG=pci-0000_00_14_0-usb-0_8
For the child device 0
---------------------------
P: /devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0
L: 0
E: DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0
E: DEVTYPE=usb_interface
E: DRIVER=uvcvideo
E: PRODUCT=bda/5841/1
E: TYPE=239/2/1
E: INTERFACE=14/1/0
E: MODALIAS=usb:v0BDAp5841d0001dcEFdsc02dp01ic0Eisc01ip00in00
E: SUBSYSTEM=usb
E: USEC_INITIALIZED=9014831781
E: ID_USB_CLASS_FROM_DATABASE=Miscellaneous Device
E: ID_USB_PROTOCOL_FROM_DATABASE=Interface Association
E: ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.
E: ID_PATH=pci-0000:00:14.0-usb-0:8:1.0
E: ID_PATH_TAG=pci-0000_00_14_0-usb-0_8_1_0
For the child device 1
---------------------------
P: /devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.1
L: 0
E: DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.1
E: DEVTYPE=usb_interface
E: DRIVER=uvcvideo
E: PRODUCT=bda/5841/1
E: TYPE=239/2/1
E: INTERFACE=14/2/0
E: MODALIAS=usb:v0BDAp5841d0001dcEFdsc02dp01ic0Eisc02ip00in01
E: SUBSYSTEM=usb
E: USEC_INITIALIZED=9014832729
E: ID_USB_CLASS_FROM_DATABASE=Miscellaneous Device
E: ID_USB_PROTOCOL_FROM_DATABASE=Interface Association
E: ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.
E: ID_PATH=pci-0000:00:14.0-usb-0:8:1.1
E: ID_PATH_TAG=pci-0000_00_14_0-usb-0_8_1_1
================================================================
udevadm info reports UNDER Kernel 6.4.0 NO event button
================================================================
For the parent camera device reports:
-------------------------------------
P: /devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4
M: 1-1.4
R: 4
U: usb
T: usb_device
D: c 189:7
N: bus/usb/001/008
L: 0
V: usb
E: DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4
E: SUBSYSTEM=usb
E: DEVNAME=/dev/bus/usb/001/008
E: DEVTYPE=usb_device
E: DRIVER=usb
E: PRODUCT=bda/5841/1
E: TYPE=239/2/1
E: BUSNUM=001
E: DEVNUM=008
E: MAJOR=189
E: MINOR=7
E: USEC_INITIALIZED=4604984331
E: ID_BUS=usb
E: ID_MODEL=USB_Camera
E: ID_MODEL_ENC=USB\x20Camera
E: ID_MODEL_ID=5841
E: ID_SERIAL=Generic_USB_Camera_200901010001
E: ID_SERIAL_SHORT=200901010001
E: ID_VENDOR=Generic
E: ID_VENDOR_ENC=Generic
E: ID_VENDOR_ID=0bda
E: ID_REVISION=0001
E: ID_USB_MODEL=USB_Camera
E: ID_USB_MODEL_ENC=USB\x20Camera
E: ID_USB_MODEL_ID=5841
E: ID_USB_SERIAL=Generic_USB_Camera_200901010001
E: ID_USB_SERIAL_SHORT=200901010001
E: ID_USB_VENDOR=Generic
E: ID_USB_VENDOR_ENC=Generic
E: ID_USB_VENDOR_ID=0bda
E: ID_USB_REVISION=0001
E: ID_USB_INTERFACES=:0e0100:0e0200:
E: ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.
E: ID_PATH_WITH_USB_REVISION=pci-0000:00:1d.0-usbv2-0:1.4
E: ID_PATH=pci-0000:00:1d.0-usb-0:1.4
E: ID_PATH_TAG=pci-0000_00_1d_0-usb-0_1_4
For the child device 0
----------------------
P: /devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4:1.0
M: 1-1.4:1.0
R: 0
U: usb
T: usb_interface
V: uvcvideo
E: DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4:1.0
E: SUBSYSTEM=usb
E: DEVTYPE=usb_interface
E: DRIVER=uvcvideo
E: PRODUCT=bda/5841/1
E: TYPE=239/2/1
E: INTERFACE=14/1/0
E: MODALIAS=usb:v0BDAp5841d0001dcEFdsc02dp01ic0Eisc01ip00in00
E: USEC_INITIALIZED=4604985948
E: ID_USB_CLASS_FROM_DATABASE=Miscellaneous Device
E: ID_USB_PROTOCOL_FROM_DATABASE=Interface Association
E: ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.
E: ID_PATH_WITH_USB_REVISION=pci-0000:00:1d.0-usbv2-0:1.4:1.0
E: ID_PATH=pci-0000:00:1d.0-usb-0:1.4:1.0
E: ID_PATH_TAG=pci-0000_00_1d_0-usb-0_1_4_1_0
For the child device 1
----------------------
P: /devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4:1.1
M: 1-1.4:1.1
R: 1
U: usb
T: usb_interface
V: uvcvideo
E: DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4:1.1
E: SUBSYSTEM=usb
E: DEVTYPE=usb_interface
E: DRIVER=uvcvideo
E: PRODUCT=bda/5841/1
E: TYPE=239/2/1
E: INTERFACE=14/2/0
E: MODALIAS=usb:v0BDAp5841d0001dcEFdsc02dp01ic0Eisc02ip00in01
E: USEC_INITIALIZED=4604994445
E: ID_USB_CLASS_FROM_DATABASE=Miscellaneous Device
E: ID_USB_PROTOCOL_FROM_DATABASE=Interface Association
E: ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.
E: ID_PATH_WITH_USB_REVISION=pci-0000:00:1d.0-usbv2-0:1.4:1.1
E: ID_PATH=pci-0000:00:1d.0-usb-0:1.4:1.1
E: ID_PATH_TAG=pci-0000_00_1d_0-usb-0_1_4_1_1
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