** Tags added: originate-from-1626412 somerville

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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:
  New
Status in xorg-server source package in Yakkety:
  New

Bug description:
  From a private bug:
  "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.

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