Public bug reported:

I have  Dell Inspiron 1721 running Januty with an Omnivision webcam.
This is a portion of "sudo lsusb -v":

Bus 001 Device 003: ID 05a9:2640 OmniVision Technologies, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 ?
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x05a9 OmniVision Technologies, Inc.
  idProduct          0x2640 
  bcdDevice            1.00
  iManufacturer           1 OmniVision Technologies, Inc. -2640-07.05.16.3
  iProduct                2 Laptop Integrated Webcam
  iSerial                 0 
  bNumConfigurations      1

As far as I can tell, uvcvideo should support this device. The camera used to 
work out of the box until recently, though I did not take notice of which 
module supported it. The module is loaded but no device is created:
na...@serre:~$ sudo lsmod | grep uvcvideo
uvcvideo               69512  0 
compat_ioctl32         18304  1 uvcvideo
videodev               45184  2 uvcvideo,compat_ioctl32
v4l1_compat            23940  2 uvcvideo,videodev
na...@serre:~$ ls /dev | grep video
na...@serre:~$ 

I also see some errors in /var/log/syslog but cannot diagnose them:

 na...@serre:~$ cat /var/log/syslog | grep uvc
Jun 25 09:32:38 serre kernel: [   18.926906] uvcvideo: Found UVC 1.00 device 
Laptop Integrated Webcam (05a9:2640)
Jun 25 09:32:38 serre kernel: [   18.927392] uvcvideo: Failed to query (135) 
UVC control 1 (unit 0) : -32 (exp. 26).
Jun 25 09:32:38 serre kernel: [   18.946456] usbcore: registered new interface 
driver uvcvideo
Jun 25 14:02:01 serre kernel: [16187.379111] usbcore: deregistering interface 
driver uvcvideo
Jun 25 14:02:04 serre kernel: [16190.792287] uvcvideo: Found UVC 1.00 device 
Laptop Integrated Webcam (05a9:2640)
Jun 25 14:02:04 serre kernel: [16190.794006] uvcvideo: Failed to query (135) 
UVC control 1 (unit 0) : -32 (exp. 26).
Jun 25 14:02:04 serre kernel: [16190.794730] uvcvideo: Failed to query (129) 
UVC control 1 (unit 0) : -32 (exp. 26).
Jun 25 14:02:04 serre kernel: [16190.794739] uvcvideo: Failed to initialize the 
device (-5).
Jun 25 14:02:04 serre kernel: [16190.794885] usbcore: registered new interface 
driver uvcvideo

The full /var/log/syslog is attached. This bug is similar to
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/303755, though I
don't think they are the same. Any help is greatly appreciated.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Omnivision integrated webcam stopped working
https://bugs.launchpad.net/bugs/392310
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