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 Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1169720 Title: Not work Logitech HD Pro Webcam C920 Status in The Linux Kernel: Confirmed Status in “linux” package in Ubuntu: Incomplete Bug description: Attach dmesg ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-3.8.0-18-generic 3.8.0-18.28 ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6 Uname: Linux 3.8.0-18-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: caravena 2196 F.... pulseaudio /dev/snd/controlC0: caravena 2196 F.... pulseaudio Date: Tue Apr 16 17:34:27 2013 HibernationDevice: RESUME=UUID=935761c6-0879-49ed-b5a5-c5218c97b843 InstallationDate: Installed on 2013-02-06 (69 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20121126) Lsusb: Bus 001 Device 005: ID 046d:082d Logitech, Inc. Bus 001 Device 002: ID 046d:0896 Logitech, Inc. OrbiCam Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: Acer, inc. Ferrari 1000 MarkForUpload: True PccardctlIdent: Socket 0: no product info available PccardctlStatus: Socket 0: no card ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-18-generic root=UUID=d1524094-f99b-4050-8e1b-40b1526ca8f7 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-18-generic N/A linux-backports-modules-3.8.0-18-generic N/A linux-firmware 1.105 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/11/07 dmi.bios.vendor: Acer dmi.bios.version: v1.3204 dmi.board.name: Ferrari6 dmi.board.vendor: Acer, Inc. dmi.board.version: Not Applicable dmi.chassis.type: 1 dmi.chassis.vendor: Acer, Inc. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAcer:bvrv1.3204:bd09/11/07:svnAcer,inc.:pnFerrari1000:pvrNotApplicable:rvnAcer,Inc.:rnFerrari6:rvrNotApplicable:cvnAcer,Inc.:ct1:cvrN/A: dmi.product.name: Ferrari 1000 dmi.product.version: Not Applicable dmi.sys.vendor: Acer, inc. 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