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[Bug 837851] Re: "Color" tool in GNOME System Settings only recognizes my webcam as color-manageable device

 

Ah.  After watching the DBus traffic it seems that this is partially due
to the run-as-system-user patches.  colord uses PolicyKit to check the
user's authorisation, and PolicyKit doesn't allow an unpriviledged user
to check whether a non-self user has priviledges.  The error message
generated is:

GDBus.Error:org.freedesktop.PolicyKit1.Error.NotAuthorized: Only trusted
callers (e.g. uid 0) can use CheckAuthorization() for subjects belonging
to other identities'

This means that applications that try to register devices with colord
will fail, which is why the display and cups integration isn't working.

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https://bugs.launchpad.net/bugs/837851

Title:
  "Color" tool in GNOME System Settings only recognizes my webcam as
  color-manageable device

Status in “colord” package in Ubuntu:
  Confirmed
Status in “gnome-control-center” package in Ubuntu:
  New

Bug description:
  When I open the GNOME System Settings and click on "Color", I am
  supposed to get the list of color-manageable (via colord) devices. As
  the only device I get my webcam there, not the screen, no printers,
  ...  Seems to be a problem of colord not recognizing the devices or of
  GNOME System Settings not polling the info correctly from colord.

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References