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Hi,
the internal webcam of my laptop is not initialized.
dmesg shows that it is found:
22.549230] uvcvideo: Found UVC 1.50 device Chicony USB2.0 Camera (04f2:b684)
[ 22.624370] uvcvideo 1-7:1.0: Entity type for entity Extension 4 was not initialized!
[ 22.624373] uvcvideo 1-7:1.0: Entity type for entity Extension 3 was not initialized!
[ 22.624374] uvcvideo 1-7:1.0: Entity type for entity Processing 2 was not initialized!
[ 22.624376] uvcvideo 1-7:1.0: Entity type for entity Camera 1 was not initialized!
[ 22.624456] input: Chicony USB2.0 Camera: Chicony as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/input/input27
[ 22.628796] uvcvideo: Found UVC 1.50 device Chicony USB2.0 Camera (04f2:b684)
A file /dev/video0 is not created.
Last edited by uhoso (2020-09-30 15:28:55)
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similar problem with my usb-connected webcam (logitech C270)
[ 3939.463468] usb 4-1: SerialNumber: 33336E10
[ 3939.463927] uvcvideo: Found UVC 1.00 device <unnamed> (046d:0825)
[ 3939.576716] uvcvideo 4-1:1.0: Entity type for entity Extension 4 was not initialized!
[ 3939.576722] uvcvideo 4-1:1.0: Entity type for entity Extension 6 was not initialized!
[ 3939.576725] uvcvideo 4-1:1.0: Entity type for entity Extension 7 was not initialized!
[ 3939.576729] uvcvideo 4-1:1.0: Entity type for entity Processing 2 was not initialized!
[ 3939.576743] uvcvideo 4-1:1.0: Entity type for entity Extension 3 was not initialized!
[ 3939.576746] uvcvideo 4-1:1.0: Entity type for entity Camera 1 was not initialized!
[ 3939.576928] input: UVC Camera (046d:0825) as /devices/pci0000:00/0000:00:13.2/usb4/4-1/4-1:1.0/input/input23
[ 3940.918763] usb 4-1: set resolution quirk: cval->res = 384
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I realized that, at least in my case, the webcam shows a black screen in zoom, and other programs weren't able to access it at all because it was being used by zoom. But otherwise it works on any other software (discord, cheese)
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Installing usbutils and rebooting fixed the initialization for me. Reinstalling zoom afterwards also fixed my personal problem with that application
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Reinstalling usbutils worked for me. Marked thread solved.
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It worked only one time. Today the issue occured again. So I reopend the thread in hope, someone knows a solution.
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I found the solution in this thread: https://bbs.archlinux.org/viewtopic.php?id=259153 it refers to https://zedt.eu/tech/linux/restarting-u … em-centos/
Restarting the usb-subsystem works. Is there any way to do it automatically? I wrote a script:
#!/bin/bash
#script to start usb-subsystem and initialise webcam
cd /sys/bus/pci/drivers/xhci_hcd
sudo echo -n "0000:00:14.0" > unbind
sudo echo -n "0000:00:14.0" > bind
Is the failure relatet to any changes in the start-procedure? Does the usb-subsystem start too early?
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