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It seems that the webcam is working properly:
[ 29.173179] usb 1-1.4: reset high-speed USB device number 6 using ehci-pci
[ 1021.167771] usb 1-1.4: USB disconnect, device number 6
[ 1025.691163] usb 1-1.4: new high-speed USB device number 8 using ehci-pci
[ 1025.915931] usb 1-1.4: New USB device found, idVendor=046d, idProduct=0819
[ 1025.915941] usb 1-1.4: New USB device strings: Mfr=0, Product=0, SerialNumber=2
[ 1025.915946] usb 1-1.4: SerialNumber: 50616690
[ 1025.916653] uvcvideo: Found UVC 1.00 device <unnamed> (046d:0819)
[ 1026.017511] uvcvideo 1-1.4:1.0: Entity type for entity Extension 4 was not initialized!
[ 1026.017519] uvcvideo 1-1.4:1.0: Entity type for entity Extension 6 was not initialized!
[ 1026.017523] uvcvideo 1-1.4:1.0: Entity type for entity Extension 7 was not initialized!
[ 1026.017528] uvcvideo 1-1.4:1.0: Entity type for entity Processing 2 was not initialized!
[ 1026.017532] uvcvideo 1-1.4:1.0: Entity type for entity Extension 3 was not initialized!
[ 1026.017537] uvcvideo 1-1.4:1.0: Entity type for entity Camera 1 was not initialized!
[ 1026.018082] input: UVC Camera (046d:0819) as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/input/input14
[ 1026.517446] usb 1-1.4: set resolution quirk: cval->res = 384An application like, e.g., "wire", recognizes the camera and shows the video stream.
But for reasons I don't know guvcview can't show the pictures of the low-budget logitech webcam anymore:
[bernd_b@USB-SAAR-VER ~]$ guvcview
GUVCVIEW: version 2.0.5
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
ALSA lib pcm.c:2501:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2501:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2501:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib alsaplugin.c:186:(_snd_pcm_dca_open) dca is only for playback
ALSA lib alsaplugin.c:186:(_snd_pcm_dca_open) dca is only for playback
connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)
attempt to connect to server failed
libv4l2: error setting pixformat: Device or resource busy
V4L2_CORE: (VIDIOC_S_FORMAT) Unable to set format: Device or resource busy
GUCVIEW: could not set the defined stream format
GUCVIEW: trying first listed stream format
libv4l2: error setting pixformat: Device or resource busy
V4L2_CORE: (VIDIOC_S_FORMAT) Unable to set format: Device or resource busy
GUCVIEW: also could not set the first listed stream format
GUVCVIEW: Video capture failed
GUVCVIEW (2): Guvcview error
could not start a video stream in the device
GUVCVIEW (Qt5): fatal error (1 devices detected)
GUVCVIEW (Qt5): creating input dialogAnyone with ideas where to look for a clue?
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Some kind of false alarm from my side:
I removed my nvidia-graphics card to see how life is with intel-graphics. Everything seems fine until I tried guvcview.
Noticing that vaapi didn't work, I came to the conclusion that I have to deinstall all nvidia-340xx-stuff (drivers and utils-packages). And voilà, guvcview starts again showing my webcam stream.
Last edited by bernd_b (2018-03-28 21:57:08)
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