Joseph Salisbury,

Please, create kernel (Ubuntu 4.9.0-11.12-generic 4.9.0) + patch :
https://bugzilla.kernel.org/show_bug.cgi?id=111291#c9
https://osdn.net/users/ysato/pf/linux_sh/scm/commits/b50bde4e476dede4a28e9c8fdcd134da2f34ef2e


Laurent Pinchart 2016-09-30 10:45:38 UTC
This is a known issue, caused by

commit b50bde4e476dede4a28e9c8fdcd134da2f34ef2e
Author: Mauro Carvalho Chehab <[email protected]>
Date:   Thu May 7 22:12:38 2015 -0300

    [media] v4l2-subdev: use MEDIA_ENT_T_UNKNOWN for new subdevs
    
    Instead of abusing MEDIA_ENT_T_V4L2_SUBDEV, initialize
    new subdev entities as MEDIA_ENT_T_UNKNOWN.
    
    Acked-by: Hans Verkuil <[email protected]>
    Signed-off-by: Mauro Carvalho Chehab <[email protected]>

that added a warning to media controller core code without updating
drivers to comply with the new requirements.

The warning is harmless, drivers will eventually be updated.

** Bug watch added: Linux Kernel Bug Tracker #111291
   http://bugzilla.kernel.org/show_bug.cgi?id=111291

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https://bugs.launchpad.net/bugs/1650918

Title:
  uvcvideo 1-1.4:1.0: Entity type for entity Extension 4 was not
  initialized!

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