[Post-Install] Webcam still not working

[pider]

Hi!
Installed Kubuntu 26.04:

Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-15-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​

There are a build in webcam :
Chicony Electronics Co., Ltd Integrated Camera

It din not work on 25.10 and it is still not working on 26.04, it do show up in lsusb sometimes:

sudo lsusb
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

I did post a topic in Kubuntu 25.10 Questing Quokka, but gave up while I did not manage to find a solution.
I now hope to get some more help!

[pider]

Hi!
Suddently today it works for 1 min, this is the output:

per@per-lenovo:~$ 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​

5 min later

per@per-lenovo:~$ sudo lsusb
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 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​

per@per-lenovo:~$ kamoso
No device found
qrc:/qml/Config.qml:67: TypeError: Cannot read property 'filters' of null
qrc:/qml/Config.qml:67: TypeError: Cannot read property 'filters' of null

(kamoso:18537): GStreamer-CRITICAL **: 14:08:13.946: gst_value_collect_int_range: assertion 'collect_values[0].v_int < collect_values[1].v_int' failed

per@per-lenovo:~$ guvcview
GUVCVIEW: version 2.2.2
V4L2_CORE: ERROR opening V4L interface: Fila eller mappa finnes ikke
GUVCVIEW (1): Guvcview error
no video device (/dev/video0) found

(guvcview:22087): Gtk-WARNING **: 14:11:47.555: Theme parsing error: <data>:1:17: not a number

(guvcview:22087): Gtk-WARNING **: 14:11:47.555: Theme parsing error: <data>:1:31: Using Pango syntax for the font: style property is deprecated; please use CSS syntax

(guvcview:22087): Gtk-WARNING **: 14:11:47.555: Theme parsing error: <data>:1:17: not a number

(guvcview:22087): Gtk-WARNING **: 14:11:47.555: Theme parsing error: <data>:1:32: Using Pango syntax for the font: style property is deprecated; please use CSS syntax

Is there no driver installed?
HELP!!

[Snowhog]

Wont be helpful, but my gut feeling is that you have a failing webcam; likely an intermittent contact failure. This is a laptop? Make a and model? How old?

[pider]

Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-15-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​​

Laptop from 03-12-2024

Laptop have a hardware switch on the side.

[claydoh]

This model seems to have a lot of webcam issues reported on Lenovo's forums.

For example
https://forums.lenovo.com/t5/Gaming-...age=1#10111136

It may be worth checking the Vantage app in Windows; it may be mucking with hardware settings.
If the laptop has an F-key combo (such as fn-F3 or something) that toggles the webcam, try toggling it.
Also check if Windows Fast Startup is enabled - this can affect hardware in other operating systems.

But it being intermittent seems to indicate a loose connection internally as a likely cause.