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    #1

    [Post-Install] Webcam do not work

    Hi!
    This is my computer Lenovo Legion:
    Code:
    Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-12-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7435HS
Memory: 24 GiB of RAM (23.2 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 4070 Laptop GPU
Manufacturer: LENOVO
Product Name: 83JC
System Version: LOQ 15ARP9​

    lsusb
    Code:
    Bus 001 Device 003: ID 0489:e0cd Foxconn / Hon Hai MediaTek Bluetooth Adapter
Bus 001 Device 024: ID 04f2:b7ec Chicony Electronics Co., Ltd Integrated Camera
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 248a:8514 Maxxter Wireless Receiver
Bus 003 Device 003: ID 048d:c999 Integrated Technology Express, Inc. ITE Device(8176)
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 010 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
​
    v4l2-ctl --list-devices -D​
    Code:
    Integrated Camera: Integrated C (usb-0000:05:00.3-3):
/dev/video1
/dev/video2
/dev/media0
​
    ​
    My webcam do not work, tried several different program; Kamoso, Webcamoid and guvcview

    Kamoso give me "No device found"

    Sometimes the webcam disappears from lsusb and sometimes it is there.
    I have Googled at lot, done lot of different things, but nothing seems that helps.

    Hope for help here!

    /per
    Last edited by pider; Feb 07, 2026, 04:51 AM.
    /per
    Kubuntu 25.10
    Tags: None
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    #2
    Try switching to Plasma (X11)? On a default installation of 25.10, Plasma (X11) isn't installed; Plasma (Wayland) is the default. But you can install it. In a konsole, type: sudo apt update && sudo apt install install plasma-session-x11​

    Logout then log in, selecting Plasma (X11) at the SDDM Login Screen.
    Windows no longer obstruct my view.
    Using Kubuntu Linux since March 23, 2007.
    "It is a capital mistake to theorize before one has data." - Sherlock Holmes​
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      #3
      Code:
      Operating System: Kubuntu 25.10

KDE Plasma Version: 6.4.5

KDE Frameworks Version: 6.17.0

Qt Version: 6.9.2

Kernel Version: 6.17.0-14-generic (64-bit)

Graphics Platform: Wayland

Processors: 16 × AMD Ryzen 7 7435HS

Memory: 24 GiB of RAM (23.2 GiB usable)

Graphics Processor: NVIDIA GeForce RTX 4070 Laptop GPU

Manufacturer: LENOVO

Product Name: 83JC

System Version: LOQ 15ARP9
​
      Updated to
      Code:
      Kernel Version: 6.17.0-14-generic (64-bit)
      And then webcam worked! :-)
      /per
      Kubuntu 25.10
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        #4
        Hi!
        The problem with webcam came back, sometimes it shows up in lsusb and sometimes it do not. I run

        sudo modprobe v4l2loopback

        When I run Kamoso it turns up with black screen and not the "no device found" message.

        I tried with plasma-session-x11 and it work there, switch to Wayland again and it worked for 1 min then froze. Could not start again even in plasma-session-x11. When I get up in v4l2-ctl --list-devices, it is given different names: video4 - video 5.
        Code:
        kamoso
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
Qt Quick Layouts: Detected recursive rearrange. Aborting after two iterations.
error debugMessage: stream error: target not found
error: "../src/gst/gstpipewiresrc.c(748): on_state_changed (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:/GstPipeWireSrc:Integrate
d Camera (V4L2)"

        ​


        /pider
        Last edited by pider; Mar 24, 2026, 02:02 PM.
        /per
        Kubuntu 25.10
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          #5
          try disabling USB autosuspend
          Code:
          sudo nano /etc/default/grub
          find the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and change it to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1"
          save and exit (ctrl+O - enter - ctrl+X)
          then
          Code:
          sudo update-grub
          Code:
          sudo reboot
          ​
          Last edited by die.boer; Mar 24, 2026, 11:07 PM.
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            #6
            Hi!
            Changed grub, webcam is now showing up in lsusb
            Code:
            sudo lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 04f2:b7ec Chicony Electronics Co., Ltd Integrated Camera
Bus 001 Device 003: ID 0489:e0cd Foxconn / Hon Hai MediaTek Bluetooth Adapter
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 248a:8514 Maxxter Wireless Receiver
Bus 003 Device 003: ID 048d:c999 Integrated Technology Express, Inc. ITE Device(8176)
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
            ​
            and

            Code:
            v4l2-ctl --list-devices

Dummy video device (0x0000) (platform:v4l2loopback-000):

/dev/video2

Integrated Camera: Integrated C (usb-0000:05:00.3-3):

/dev/video0

/dev/video1

/dev/media0
            Kamoso shows only black screen.

            /pider
            /per
            Kubuntu 25.10
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              #7
              Originally posted by pider View Post
              Kamoso shows only black screen.
              Kamoso is ...crap, or at least wildly inconsistent. I do suggest sticking with guvcview, especially if it has worked, as this webcam seems to be a UVC camera.
              I personally use a newer tool called cameractrls, found on flathub. It is a bit easier to use imo that Guvcview with a bit simpler of an interface, and supports non-UVC webcams. It does not record, though.
              Self-built: Asus PRIME B550M-K/Ryzen 5600GT/32Gb/Intel ARC B580 12Gb/KDE neon
              HP Elitedesk 800 G3 Mini: i5-7500T(35w)/32Gb/Kubuntu LTS
              HP Chromebook 14: i5-1135G7/8Gb/512Gb SSD/KDE Linux​
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                #8
                please post output of these 3 commands
                Code:
                guvcview --device=/dev/video0
                Code:
                guvcview --device=/dev/video1
                Code:
                v4l2-ctl --list-formats-ext -d /dev/video0
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