[regression] Mir is assigning the first output ID = 0 (== mir_display_output_id_invalid)

Bisected. It change came from:

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revno: 4103 [merge]
author: Christopher James Halse Rogers <email address hidden>
committer: Tarmac
branch nick: development-branch
timestamp: Wed 2017-03-22 07:01:56 +0000
message:
  Clarify KMS display configuration responsibilities.

  This moves responsibility for converting between KMS hardware state and Mir DisplayOutputConfiguration to KMSOutput, moves DisplayConfigurationOutputId → KMSOutput lookup into KMSDisplayConfiguration, and makes KMSOutputContainer responsible for maintaining the set of KMSOutput as they appear and disappear.

  Approved by mir-ci-bot, Kevin DuBois, Alan Griffiths.
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Fix committed into lp:mir at revision None, scheduled for release in mir, milestone 1.0.0

This bug was fixed in the package mir - 0.27.0+17.10.20170630-0ubuntu1

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mir (0.27.0+17.10.20170630-0ubuntu1) artful; urgency=medium

  [ Daniel van Vugt ]
  * New upstream release 0.27.0 (https://launchpad.net/mir/+milestone/0.27.0)
    - ABI summary:
      . mirclient ABI unchanged at 9
      . mirserver ABI bumped to 44
      . mircommon ABI unchanged at 7
      . mirplatform ABI bumped to 61
      . mirprotobuf ABI unchanged at 3
      . mirplatformgraphics ABI bumped to 13
      . mirclientplatform ABI unchanged at 5
      . mirinputplatform ABI bumped to 7
      . mircore ABI unchanged at 1
    - Enhancements:
      . Mostly groundwork required to support major enhancements coming in
        future Mir versions.
      . Removed android-input and eliminated the entire "3rd_party/" subtree.
        Now the Mir source tree contains original code only.
      . Added mir_prompt_session_new_fds_for_prompt_providers_sync API.
      . mirout: Added load and save options for keeping display configs
        on disk.
      . mirout: Added "--" support for applying configuration changes under
        Unity8.
      . Fixed failure of DRM hardware cursor {hide(); show(image);}
      . Added server option: "--cursor software" (MIR_SERVER_CURSOR=software)
      . Added letterboxing/black bars support to the GL renderer in preparation
        for generic output cloning.
      . Added client API for getting the logical size of an output.
      . Migrated MirCookie to use SHA-256.
      . Ensure RealKMSOutputConfiguration stays in sync with actual hardware
        state.
      . Added support for drag-and-drop.
      . Lots of other client API enhancements.
      . Minor clean-ups, optimizations and dead code removal.
      . Added support for building on Ubuntu 17.10 artful.
      . Update example code to use undeprecated API.
      . mesa-kms: Support hardware cursors in hybrid setups.
      . Rework and publish the graphics platform APIs
    - Bugs fixed:
      . [enhancement] Make able to get version information from client /
        server APIs (LP: #1195540)
      . Touch screen coordinates don't rotate with the screen (LP: #1349660)
      . Subpixel order not included in Mir display information (LP: #1393578)
      . [enhancement] Missing client API for relative surface movement (e.g.
        dragging client-decorated windows) (LP: #1420334) . Mir does not reset
        key states when paused or resumed (modifiers get stuck after VT
        switching) (LP: #1536279)
      . NBS never uses mc::MultiMonitorMode::single_monitor_fast, even when
        only a single monitor is plugged in (LP: #1561418)
      . Inconsistent behaviour of Num Lock (LP: #1588237)
      . A scaled (not panned or clipped) mirror/clone mode is desired
        (LP: #1639226)
      . Rotating an output left or right without restarting the
        compositor distorts the image (LP: #1643488)
      . support display scaling slider in unity8 (LP: #1645372)
      . [ FAILED ] NestedInputWithMouse.mouse_pointer_coordinates_in_nested_
        server_are_accumulated (LP: #1646375)
      . [ FAILED ] NestedInputWithMouse.mouse_pointer_position_is_in_sync_with_
        ho...