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[Launchpad Bug Tracker <1636397@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xorg-server - 2:1.18.4-0ubuntu0.2

---------------
xorg-server (2:1.18.4-0ubuntu0.2) xenial; urgency=medium

  * modesetting-unifdef-slave-support.diff: Fix modesetting slave output
    names. (LP: #1636397)

 -- Timo Aaltonen <tjaalton@xxxxxxxxxx>  Tue, 01 Nov 2016 10:08:51 +0200

** Changed in: xorg-server (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1636397

Title:
  Fix modesetting slave output names

Status in HWE Next:
  New
Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server source package in Xenial:
  Fix Released
Status in xorg-server source package in Yakkety:
  Fix Released

Bug description:
  [Impact]
  Currently, NVIDIA and modesetting drivers are using same output names, that creates confusion for xrandr clients like gnome-setting-daemon or xrandr utility.

  When modesetting outputs act as slave for other x-screen (like NVIDIA
  X-screen here), modesetting driver uses different scheme of output
  names to avoid kind of confusion we are seeing here. There is a bug in
  modesetting X-driver gets shipped with X-server, which disables slave
  output's name scheme.

  From a reviewed upstream patch:

  "Commit c7e8d4a6ee9542f56cd241cf7a960fb8223a6b22 had already
  unifdef MODESETTING_OUTPUT_SLAVE_SUPPORT but commit
  9257b1252da9092ddc676fec9aabe2b33dfad272 didn't notice that."

  so we need to backport that to zesty/yakkety/xenial.

  [Test Case]
  Enable dGPU, test that output to DP works.

  [Regression Potential]
  There should be none, as this leftover was a simple mistake that shouldn't be there.

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