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
Status in Light Display Manager:
New
Status in xserver-xorg-driver-radeonhd:
Invalid
Status in lightdm package in Ubuntu:
New
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
(20160420.1)
SourcePackage: lightdm
UpgradeStatus: Upgraded to zesty on 2017-05-22 (0 days ago)
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