I've come across this again after upgrading to 18.10

$ xrandr --listproviders                                      
Providers: number : 1
Provider 0: id: 0x56 cap: 0x9, Source Output, Sink Offload crtcs: 4 outputs: 3 
associated providers: 0 name:KAVERI @ pci:0000:00:01.0

$ sudo lspci -nn | grep -E 'VGA|Display'
[sudo] password for richard: 
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Kaveri [Radeon R7 Graphics] [1002:1313]
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] RV770 [Radeon HD 4850] [1002:9442]

Only the built-in Radeon R7 is being used

** Changed in: lightdm
       Status: Invalid => New

** Changed in: lightdm (Ubuntu)
       Status: Invalid => New

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  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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