uvcvideo fails to init camera and then dmesg is full with traces

[anatoly techtonik]

The dmesg log should be attached. Camera doesn't work. It worked once when I first plugged it and run guvcview (cheese couldn't find it). Offending lines:

[ 184.760036] usb 2-4: new high-speed USB device number 2 using ehci-pci
[ 184.936757] usb 2-4: New USB device found, idVendor=0ac8, idProduct=3420
[ 184.936762] usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 184.936765] usb 2-4: Product: Vimicro USB2.0 Camera
[ 184.936768] usb 2-4: Manufacturer: Vimicro Corp.
[ 185.096698] media: Linux media interface: v0.10
[ 185.137703] Linux video capture interface: v2.00
[ 236.272492] usbcore: registered new interface driver snd-usb-audio
[ 236.273934] uvcvideo: Found UVC 1.00 device Vimicro USB2.0 Camera (0ac8:3420)
[ 236.291047] uvcvideo 2-4:1.0: Entity type for entity Processing 2 was not initialized!
[ 236.291054] uvcvideo 2-4:1.0: Entity type for entity Camera 1 was not initialized!
[ 236.291057] uvcvideo 2-4:1.0: Entity type for entity Extension 4 was not initialized!
[ 236.291781] input: Vimicro USB2.0 Camera as /devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4:1.0/input/input14
[ 236.303796] usbcore: registered new interface driver uvcvideo
[ 236.303799] USB Video Class driver (1.1.1)
[ 256.624304] usb 2-4: USB disconnect, device number 2
[ 256.648053] ------------[ cut here ]------------
[ 256.648063] WARNING: CPU: 1 PID: 6752 at /build/linux-RZGRu0/linux-4.8.0/fs/sysfs/group.c:237 sysfs_remove_group+0x8b/0x90
[ 256.648065] sysfs group ffffffff9c8d04a0 not found for kobject 'event14'

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-image-4.8.0-34-generic 4.8.0-34.36
ProcVersionSignature: Ubuntu 4.8.0-34.36-generic 4.8.11
Uname: Linux 4.8.0-34-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: techtonik 6121 F.... pulseaudio
 /dev/snd/controlC0: techtonik 6121 F.... pulseaudio
Date: Thu Jan 12 11:40:54 2017
HibernationDevice: RESUME=UUID=89bb43be-f25f-4caa-9f0c-7bb67d5f5583
MachineType: System manufacturer P5KR
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-34-generic root=UUID=8814b3f6-00a6-45a7-a112-afd933fdc5b5 ro quiet splash vt.handoff=7
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.8.0-34-generic N/A
 linux-backports-modules-4.8.0-34-generic N/A
 linux-firmware 1.161.1
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to yakkety on 2016-10-20 (84 days ago)
dmi.bios.date: 06/26/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0703
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5KR
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0703:bd06/26/2008:svnSystemmanufacturer:pnP5KR:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5KR:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: P5KR
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.10 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10-rc3

[anatoly techtonik (techtonik)]

I don't remember that I tried to use this camera before.

Trying to follow the instructions at https://wiki.ubuntu.com/KernelMainlineBuilds - it says to uninstall out-of-tree modules, but doesn't refer to how to identify them and actually uninstall.

There is exactly the same issue at https://unix.stackexchange.com/questions/196616/identify-out-of-tree-modules but provided solution looks more like hack. Maybe it is outdated and there is a better official way to get them?

[anatoly techtonik (techtonik)]

I failed to run on new kernel - I tried to run linux-image-4.10.0-041000rc4-generic_4.10.0-041000rc4.201701152031_amd64.deb and it just hangs.

I also tried to remove nvidia module and failed.
http://askubuntu.com/questions/875310/where-nvidia-kernel-module-is-hiding

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]