[Post-Install] Webcam do not work

[pider]

Hi!
This is my computer Lenovo Legion:

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

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

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

[Snowhog]

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.

[pider]

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

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

And then webcam worked! :-)

[pider]

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.

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

[die.boer]

try disabling USB autosuspend

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

sudo update-grub

sudo reboot

[pider]

Hi!
Changed grub, webcam is now showing up in lsusb

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

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

[claydoh]

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.

[die.boer]

please post output of these 3 commands

guvcview --device=/dev/video0

guvcview --device=/dev/video1

v4l2-ctl --list-formats-ext -d /dev/video0

[pider]

Hi
Here are my commands:

guvcview --device=/dev/video0
GUVCVIEW: version 2.2.1
V4L2_CORE: ERROR opening V4L interface: Fila eller mappa finnes ikke
GUVCVIEW (1): Guvcview error
        no video device (/dev/video0) found

(guvcview:80224): Gtk-WARNING **: 14:53:47.372: Theme parsing error: <data>:1:17: not a number

(guvcview:80224): Gtk-WARNING **: 14:53:47.372: Theme parsing error: <data>:1:31: Using Pango syntax for the font: style propert
y is deprecated; please use CSS syntax

(guvcview:80224): Gtk-WARNING **: 14:53:47.372: Theme parsing error: <data>:1:17: not a number

(guvcview:80224): Gtk-WARNING **: 14:53:47.372: Theme parsing error: <data>:1:32: Using Pango syntax for the font: style propert
y is deprecated; please use CSS syntax

(guvcview:80224): Gtk-WARNING **: 14:53:47.372: Theme parsing error: <data>:1:17: not a number

(guvcview:80224): Gtk-WARNING **: 14:53:47.372: Theme parsing error: <data>:1:26: Using Pango syntax for the font: style propert
y is deprecated; please use CSS syntax​

guvcview --device=/dev/video1
GUVCVIEW: version 2.2.1
V4L2_CORE: ERROR opening V4L interface: Fila eller mappa finnes ikke
GUVCVIEW (1): Guvcview error
no video device (/dev/video1) found

(guvcview:85845): Gtk-WARNING **: 14:57:01.074: Theme parsing error: <data>:1:17: not a number

(guvcview:85845): Gtk-WARNING **: 14:57:01.074: Theme parsing error: <data>:1:31: Using Pango syntax for the font: style propert
y is deprecated; please use CSS syntax

(guvcview:85845): Gtk-WARNING **: 14:57:01.074: Theme parsing error: <data>:1:17: not a number

(guvcview:85845): Gtk-WARNING **: 14:57:01.074: Theme parsing error: <data>:1:32: Using Pango syntax for the font: style propert
y is deprecated; please use CSS syntax

(guvcview:85845): Gtk-WARNING **: 14:57:01.074: Theme parsing error: <data>:1:17: not a number

(guvcview:85845): Gtk-WARNING **: 14:57:01.074: Theme parsing error: <data>:1:26: Using Pango syntax for the font: style propert
y is deprecated; please use CSS syntax

4l2-ctl --list-formats-ext -d /dev/video0
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture

[0]: 'MJPG' (Motion-JPEG, compressed)
Size: Discrete 1280x720
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 960x540
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 320x240
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 320x180
Interval: Discrete 0.033s (30.000 fps)
[1]: 'YUYV' (YUYV 4:2:2)
Size: Discrete 1280x720
Interval: Discrete 0.100s (10.000 fps)
Size: Discrete 960x540
Interval: Discrete 0.067s (15.000 fps)
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 320x240
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 320x180
Interval: Discrete 0.033s (30.000 fps)​
​

Here are 2 more commands:

v4l2-ctl --list-devices
Integrated Camera: Integrated C (usb-0000:05:00.3-3):
/dev/video0
/dev/video2
/dev/media0​

sudo lsusb
[sudo: authenticate] Password:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0489:e0cd Foxconn / Hon Hai MediaTek Bluetooth Adapter
Bus 001 Device 005: 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: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​

Hope for help :-)

[Snowhog]

my computer Lenovo Legion:

What model?

AI Overview

Chicony Electronics Co., Ltd integrated cameras on Lenovo Legion laptops generally use the UVC (USB Video Class) driver, which is built directly into the Linux kernel and should work out-of-the-box on Kubuntu 25.10.
If the camera is not working, it is likely due to a physical privacy switch, a kernel-level conflict, or missing IPU6/MIPI drivers on newer Legion models (e.g., Legion 7/S7 2023-2024 models).

Step 1: Preliminary Check

Physical Switch/Keyboard Shortcut: Check for a physical camera slider on top of the screen or a function key (Fn + F8/F10) that disables the camera.

Check USB Detection: Run the following command in a terminal to see if the device is recognized:

lsusb | grep -i chicony

If it appears as ID 04f2:b605 or similar, the camera is detected, and the issue is likely driver-related or software locking it.

Step 2: Fixing "Missing" or Non-Functional Camera

If the camera is listed in lsusb but not working (black screen, app crashes):

Update and Upgrade: Ensure your system is completely up-to-date:

sudo apt update && sudo apt full-upgrade

Restart Camera Service:

sudo systemctl restart pipewire

Install IPU6 Drivers (For Newer Legion Laptops): Some new Lenovo Legion laptops use MIPI/IPU6 cameras rather than USB UVC cameras. If you have a newer Legion, you may need specialized drivers (IPU6/MIPI) which are sometimes only provided in patched kernels (e.g., Ubuntu 24.04/25.04) and might require a lower kernel version to work properly.

Step 3: Troubleshooting Specific Scenarios

Camera Detected as Keyboard: If the system log (dmesg) shows the camera wrongly identified, this is a known bug often resolved by updating to the latest kernel or applying udev rules.

Device Power Failure: If the camera fails with a Power Status Failure error (often in dual-boot scenarios), uninstalling the camera driver from Windows Device Manager and restarting allows Windows to reset the power state, which often fixes it for subsequent Linux usage.

Lenovo Legion Linux (LLL): For better control of Legion hardware, consider installing the Lenovo Legion Linux project, which provides drivers for specialized hardware features.

Typical Driver Information

On a working Legion laptop, the camera will show as:

Driver Name: uvcvideo

Card Type: Integrated Camera: Integrated C

If you are using a very new Legion model (2025/late 2024), you may need to wait for kernel 6.18+ or check the Ubuntu Hardware Probes website to find specific camera patches for your model.