what can cause my /dev/video* to get deleted (disabling my camera) and how do I fix it?

hidetzugu

3/30/23, 8:52 AM

my integrated webcam suddenly stopped working.

Most online advice seem to rely on v4l2-ctl which pulls data from /dev/video0 but apparently this directory does not exist.

Some people seem to have this problem due to camera disabling Fn+key combinations but I own a Dell precision 5530 which I don't believe has this Fn option (according to this at least).

I also tried dmesg from which (after some fanangling) I got

dmesg | grep -i -e camera -e uvcvideo -e "usb 1-12"

[    2.274981] usb 1-12: new high-speed USB device number 5 using xhci_hcd
[    2.436692] usb 1-12: New USB device found, idVendor=0c45, idProduct=6365, bcdDevice= 0.00
[    2.436693] usb 1-12: New USB device strings: Mfr=2, Product=1, SerialNumber=0
[    2.436694] usb 1-12: Product: USB 2.0 Camera
[    2.436695] usb 1-12: Manufacturer: Sonix Technology Co., Ltd.
[    3.218112] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:6365)
[    3.218817] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
[    3.219327] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 26).
[    3.219329] uvcvideo: Failed to initialize the device (-5).
[    3.219381] usbcore: registered new interface driver uvcvideo
[ 1654.404017] usbcore: deregistering interface driver uvcvideo
[ 1654.655370] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:6365)
[ 1654.656064] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
[ 1654.656508] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 26).
[ 1654.656511] uvcvideo: Failed to initialize the device (-5).
[ 1654.656575] usbcore: registered new interface driver uvcvideo

I'm not sure how to interpret this "failed to query". Is it just a "it is broken"? could there be another explanation? How would I check? and, if not, would the hardware breaking automatically delete /dev/video*? I wouldn't expect that

Edit: kernel version 5.4.0-91-generic

205

0 + 0

webcam

camera

dmesg

hidetzugu

4/2/23, 8:30 AM

I'm not sure if [this](https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1881757?comments=all) is exactly the same issue but, if it is, this seems to be a kernel dependent problem so I'll add that my kernel version is `5.4.0-91-generic`

hidetzugu

4/7/23, 7:35 PM

it "fixed itself" (sorry I can't be more precise :/ ), there was a firmware update in the meantime.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: what can cause my /dev/video* to get deleted (disabling my camera) and how do I fix it?

TH: อะไรทำให้ /dev/video* ของฉันถูกลบ (ปิดใช้งานกล้อง) และฉันจะแก้ไขได้อย่างไร

RO: ce poate face ca /dev/video*ul meu să fie șters (dezactivând camera) și cum îl repar?

RU: что может привести к удалению моего /dev/video* (отключение моей камеры) и как это исправить?

VI: điều gì có thể khiến /dev/video* của tôi bị xóa (tắt máy ảnh của tôi) và làm cách nào để khắc phục?

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