Please note that while the above "quirk based" patch by gmiscko does
make the Acer Integrated Camera work, it is an earlier attempt at the
fix which was not approved by the UVC maintainer. The patch that has
been signed off and sent towards upstream maintainers attempts to fix
the brokenness in a general purpose way, without relying on the specific
product id.

The patch that is expected to reach upstream kernel is this:
https://git.linuxtv.org/media_tree.git/commit/?id=e950267ab802c8558f1100eafd4087fd039ad634

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https://bugs.launchpad.net/bugs/1433906

Title:
  Acer, Inc ID 5986:055a is useless after 14.04.2 installed.

Status in HWE Next:
  Won't Fix
Status in linux package in Ubuntu:
  In Progress
Status in linux-lts-vivid package in Ubuntu:
  Triaged
Status in linux-lts-xenial package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux package in Arch Linux:
  New
Status in Fedora:
  Unknown

Bug description:
  CID : 201411-16166 Lenovo E450 (I+A) with 14.04.2 (utopic)
  CID : 201408-15472 Lenovo E555 (A+A) with 14.04.2 (utopic)

  Steps:
  1. Install 14.04.2 on E450 or E555.
  2. Log in system and open a terminal.
  3. $ gst-launch-0.10 v4l2src ! xvimagesink

  Expected result:
  Camara is activated

  Actual result:
  $  gst-launch-0.10 v4l2src ! xvimagesink
  Setting pipeline to PAUSED ...
  ERROR: Pipeline doesn't want to pause.
  ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Cannot 
identify device '/dev/video0'.
  Additional debug info:
  v4l2_calls.c(497): gst_v4l2_open (): 
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
  system error: No such file or directory
  Setting pipeline to NULL ...
  Freeing pipeline ...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: 
boot/vmlinuz-3.16.0-30-generic]
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar 19 02:21:31 2015
  InstallationDate: Installed on 2015-03-16 (2 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 
(20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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