I have the need todo some videoconferencing. In my Laptop there is a webcam built-in. But none of the apps can found it. Most time i get the message: Cannot open video device /dev/video0: No such file or directory
Either the hardware is unsupported or it is disabled by firmware setting or hardware switch.
Ensure the device is enabled (firmware or hardware) then copy and paste the textual output from the command
lsusb
Also the textual output from the command
inxi -SMGxxxlsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 1770:ff00 MSI steel series rgb keyboard
Bus 001 Device 004: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 003: ID 8087:0aa7 Intel Corp. Wireless-AC 3168 Bluetooth
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
inxi -SMGxxx:
System:
Host: MSI Kernel: 5.15.41-1-MANJARO arch: x86_64 bits: 64 compiler: gcc
v: 12.1.0 Desktop: GNOME v: 42.1 tk: GTK v: 3.24.34 wm: gnome-shell dm: GDM
v: 42.0 Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Laptop System: Micro-Star product: GP72 7RD v: REV:1.0
serial: <superuser required> Chassis: type: 10 serial: <superuser required>
Mobo: Micro-Star model: MS-1799 v: REV:1.0 serial: <superuser required>
UEFI: American Megatrends v: E1799IMS.324 date: 03/23/2018
Graphics:
Device-1: Intel HD Graphics 630 vendor: Micro-Star MSI driver: i915
v: kernel ports: active: eDP-1 empty: DP-1,HDMI-A-1,HDMI-A-2
bus-ID: 00:02.0 chip-ID: 8086:591b class-ID: 0300
Device-2: NVIDIA GP107M [GeForce GTX 1050 Mobile] vendor: Micro-Star MSI
driver: nvidia v: 510.73.05 arch: Maxwell pcie: speed: 2.5 GT/s lanes: 16
bus-ID: 01:00.0 chip-ID: 10de:1c8d class-ID: 0302
Display: x11 server: X.Org v: 21.1.3 with: Xwayland v: 22.1.1
compositor: gnome-shell driver: X: loaded: modesetting,nvidia
alternate: fbdev,nouveau,nv,vesa gpu: i915 display-ID: :1 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
s-diag: 582mm (22.93")
Monitor-1: eDP-1 model: ChiMei InnoLux 0x1735 res: 1920x1080 hz: 60
dpi: 128 size: 382x215mm (15.04x8.46") diag: 438mm (17.3") modes: 1920x1080
OpenGL: renderer: Mesa Intel HD Graphics 630 (KBL GT2) v: 4.6 Mesa 22.0.4
direct render: Yes
I will try to boot to the bios, maybe something is disabled there. But i cant believe that, because it was working on Windows 10.
There is no detected camera - that means the camera is offline - if the kernel cannot see it then it is not there - I know - physically it is but kernel wise it is not.
Works in Windows is no guarantee it works with Linux - that said - perhaps the camera can only be turned on by a Windows software - so check and ensure it is turned on - then reboot into Linux and recheck the outputs.
As your system firmware dates back to March 2018 - one would think it had been added.
There is really nothing I can say to cheer you up - it must be really rare or perhaps faulty.
Try the hardware switch either FnF6 or just F6
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If using the Fn hotkeys to enable/disable doesn’t work under Manjaro, there’s another route to investigate.
While booted into Windows, is there any way you can get the information about the integrated webcam hardware?
You might be able to find it under the Device Manager or Devices section of your Control Panel or Settings.
It might not even be a uvcvideo compatible webcam. 
It seems to work now. After booting to Windows, i could enable the cam via FnF6 as suggested. After that, i could boot to Linux and the cam works there to. I could disable the cam again, by pressing FnF6 again, but enabling again as not possible in Linux. But after pressing FnF6 several time, it seems to enable the cam no also on Linux. Don’t know, why this isn’t working every time. But that’s not a big issue.
Many thx for all your help.
I know it’s marked as solved, but for the sake of future readers and internet searches, are you now able to provide the output (while in Linux) of this webcam’s information using the commands above again?
Sure. lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 1770:ff00 MSI steel series rgb keyboard
Bus 001 Device 005: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 008: ID 04f2:b521 Chicony Electronics Co., Ltd USB 2.0 Webcam Device
Bus 001 Device 003: ID 8087:0aa7 Intel Corp. Wireless-AC 3168 Bluetooth
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
inxi -SMGxxx
System:
Host: MSI Kernel: 5.15.41-1-MANJARO arch: x86_64 bits: 64 compiler: gcc
v: 12.1.0 Desktop: GNOME v: 42.1 tk: GTK v: 3.24.34 wm: gnome-shell dm: GDM
v: 42.0 Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Laptop System: Micro-Star product: GP72 7RD v: REV:1.0
serial: <superuser required> Chassis: type: 10 serial: <superuser required>
Mobo: Micro-Star model: MS-1799 v: REV:1.0 serial: <superuser required>
UEFI: American Megatrends v: E1799IMS.324 date: 03/23/2018
Graphics:
Device-1: Intel HD Graphics 630 vendor: Micro-Star MSI driver: i915
v: kernel ports: active: eDP-1 empty: DP-1,HDMI-A-1,HDMI-A-2
bus-ID: 00:02.0 chip-ID: 8086:591b class-ID: 0300
Device-2: NVIDIA GP107M [GeForce GTX 1050 Mobile] vendor: Micro-Star MSI
driver: nvidia v: 510.73.05 arch: Pascal pcie: speed: 2.5 GT/s lanes: 16
bus-ID: 01:00.0 chip-ID: 10de:1c8d class-ID: 0302
Device-3: Chicony USB 2.0 Webcam Device type: USB driver: uvcvideo
bus-ID: 1-11:8 chip-ID: 04f2:b521 class-ID: 0e02 serial: 200901010001
Display: x11 server: X.Org v: 21.1.3 with: Xwayland v: 22.1.1
compositor: gnome-shell driver: X: loaded: modesetting,nvidia
alternate: fbdev,nouveau,nv,vesa gpu: i915 display-ID: :1 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
s-diag: 582mm (22.93")
Monitor-1: eDP-1 model: ChiMei InnoLux 0x1735 res: 1920x1080 hz: 60
dpi: 128 size: 382x215mm (15.04x8.46") diag: 438mm (17.3") modes: 1920x1080
OpenGL: renderer: Mesa Intel HD Graphics 630 (KBL GT2) v: 4.6 Mesa 22.0.4
direct render: Yes
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