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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https://bugs.launchpad.net/bugs/1692437
Title:
Monitors on second GPU not working after upgrade to zesty
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