lspci and lshw show 2 GPUs. The builtin one, and the actual card, but
xrandr only lists one provider.

$ 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


Might be a bug in the radeon driver?

** Also affects: lightdm
   Importance: Undecided
       Status: New

** Also affects: xserver-xorg-driver-radeonhd
   Importance: Undecided
       Status: New

** Attachment added: "lspci -vvv"
   
https://bugs.launchpad.net/xserver-xorg-driver-radeonhd/+bug/1692437/+attachment/4881502/+files/lspci.txt

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https://bugs.launchpad.net/bugs/1692437

Title:
  Monitors on second GPU not working after upgrade to zesty

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