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. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/colord/+bug/837851/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
