I filmed my computer boot up to better show what happens. The right
monitor is on the integrated video card (the R7), and doesn't show
anything initially. The center and left monitor turn on and mirror each
other during boot, and show grub and most of the kernel and systemd
messages, then at some point all output is sent to the right monitor. I
believe the systemd log says something along the lines of "detecting all
video cards" at that point.

** Attachment added: "Computerbootup.webm"

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Touch seeded packages, which is subscribed to lightdm in Ubuntu.

  Monitors on second GPU not working after upgrade to zesty

Status in Light Display Manager:
Status in xserver-xorg-driver-radeonhd:
Status in lightdm package in Ubuntu:

Bug description:
  I'm not 100% sure this is the right package to file the bug against,
  but since upgrading to zesty the two monitors on my second GPU are no
  longer detected once I reach the greeter screen at login time.
  However, both of them display information during boot.

  Let me know how I can narrow down the bug report.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: lightdm 1.22.0-0ubuntu2.1
  ProcVersionSignature: Ubuntu 4.8.0-52.55-generic 4.8.17
  Uname: Linux 4.8.0-52-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon May 22 01:42:58 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-29 (388 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to zesty on 2017-05-22 (0 days ago)

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