I'm not sure if this is the same bug, but the information may be useful. For me the camera and audio work, but if my machine is left to sleep for a 'while' (longer than a few minutes?) it seems to disappear - Cheese and Google Hangouts can't find it (can't find audio or video). Logging out does not fix the problem but rebooting does. I forgot to see if it was still in the output from lsusb before I rebooted. Looking back at various syslogs, I found the following - the first line occurs 6 times.
Sep 25 21:45:35 my_machine pulseaudio[30194]: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="2" name="usb-046d_HD_Pro_Webcam_C920_B8C21EAF-02-C920" card_name="alsa_card.usb-046d_HD_Pro_Webcam_C920_B8C21EAF-02-C920" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=no card_properties="module-udev-detect.discovered=1""): initialization failed. Sep 25 21:45:35 my_machine pulseaudio[30194]: [pulseaudio] module-udev-detect.c: Tried to configure /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.2/sound/card2 (alsa_card.usb-046d_HD_Pro_Webcam_C920_B8C21EAF-02-C920) more often than 5 times in 10s Sep 25 21:52:42 my_machine kernel: [ 1.926142] usb 2-1.5: Product: HD Pro Webcam C920 Sep 25 21:52:44 my_machine kernel: [ 24.106650] uvcvideo: Found UVC 1.00 device HD Pro Webcam C920 (046d:082d) Sep 25 21:52:44 my_machine kernel: [ 24.108392] input: HD Pro Webcam C920 as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/input/input13 Sep 25 21:52:48 my_machine colord: Device added: sysfs-046d-HD_Pro_Webcam_C920 Sep 25 21:54:20 my_machine kernel: [ 1.921948] usb 2-1.5: Product: HD Pro Webcam C920 Sep 25 21:54:20 my_machine kernel: [ 24.370524] uvcvideo: Found UVC 1.00 device HD Pro Webcam C920 (046d:082d) Sep 25 21:54:20 my_machine kernel: [ 24.371163] input: HD Pro Webcam C920 as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/input/input13 Sep 25 21:54:23 my_machine colord: Device added: sysfs-046d-HD_Pro_Webcam_C920 I am running Ubuntu 13.04, uname -a says '3.8.0-19-generic #30-Ubuntu SMP Wed May 1 16:35:23 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux' What may be more useful for this bug is the relevant lines from dmesg after the reboot: [ 1.831488] usb 2-1.5: new high-speed USB device number 5 using ehci-pci [ 1.926108] usb 2-1.5: New USB device found, idVendor=046d, idProduct=082d [ 1.926114] usb 2-1.5: New USB device strings: Mfr=0, Product=2, SerialNumber=1 [ 1.926119] usb 2-1.5: Product: HD Pro Webcam C920 [ 1.926122] usb 2-1.5: SerialNumber: B8C21EAF .... [ 23.640163] Linux video capture interface: v2.00 [ 23.813615] uvcvideo: Found UVC 1.00 device HD Pro Webcam C920 (046d:082d) [ 23.813639] usbcore: registered new interface driver snd-usb-audio [ 23.814750] input: HD Pro Webcam C920 as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/input/input14 [ 23.814863] usbcore: registered new interface driver uvcvideo [ 23.814865] USB Video Class driver (1.1.1) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1169720 Title: Not work Logitech HD Pro Webcam C920 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1169720/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
