@seb128 I have edited the bug description to provide more information on how the issue is triggered. The bug occurs during the handoff of gdm3 ---> gnome-shell(mutter?) _after_ login. The issue is repeatedly and consistently triggered until GDM(gdm3) is replaced by LightDM(slick- greeter) and then the issues disappears completely and the system is works across multiple reboots or changes to the monitors.xml through the "Displays" settings.
This is clearly related to how GDM appears to set-up or create the user session and I would be glad to test any ideas you have to solve it while using GDM, however---after 4-hours of messing with it, I had to go with a solution that "Just Works": slick-greeter or lightdm. Please let me know what else I can provide or do to clarify this issue. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1820423 Title: monitors.xml is not parsed or applied correctly after reboot or shutdown Status in gdm3 package in Ubuntu: Incomplete Status in gnome-shell package in Ubuntu: Incomplete Bug description: WORKAROUND: replace gdm3 with slick-greeter + lightdm-settings + gnome-screensaver + numlockx(optionally) TL;DR After a clean install of Ubuntu 18.10, connecting a FHD(1920x1080) LED monitor to the VGA port of a DELL Optiplex 390 desktop tower, connecting a wireless HDMI Tx/Rx(LKV HDbitT-4K) to the HDMI port with a 4K projector and then configuring the logical monitor layout in the "Displays" settings dialog, I can successfully create and use a multi monitor setup in my current session. However, upon a reboot or power cycle of the computer and a successful login from GDM(gdm3), the HDMI goes dark(blank?) and the VGA monitor shows as 'Secondary' monitor even though I set it as 'Primary' in the "Displays" dialog. The monitors.xml file, attached, shows the correct layout and survives the reboot without alteration. I am unable to see anything on the 'Primary' display, which has incorrectly been given to the HDMI projector. Unseating the HDMI cable does not restore the VGA to 'Primary' display automatically and I must reboot the computer while leaving the HDMI unplugged in order to restore my ability to see the 'Primary' display on the VGA connection. Replacing GDM(gdm3) with LightDM(slick-greeter) fixes the issue and is repeatedly provable through multiple reboots or changes to the logical layout of the screens in the 'Displays' settings of gnome-control-center. ERROR(syslog) = "Failed to get current display configuration state: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.Mutter.DisplayConfig" does not exist" gnome-shell[3007]: JS ERROR: Exception in callback for signal: loaded: TypeError: monitor is null#012_prepareStartupAnimation@resource:///org/gnome/shell/ui/layout.js:653:17#012wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22#012_loadBackground/signalId<@resource:///org/gnome/shell/ui/layout.js:608:13#012_emit@resource:///org/gnome/gjs/modules/signals.js:128:27#012_init/id<@resource:///org/gnome/shell/ui/background.js:512:17 CAUSE = clean install of Ubuntu 18.10(4.18.0-16-generic #17-Ubuntu SMP Fri Feb 8 00:06:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux), attach VGA as primary monitor and HDMI(wireless Tx) as secondary to projector and then apply custom monitor positioning using g-c-c "Displays" panel. RESULT = correct positioning and working of multiple displays until reboot or shutdown and then subsequent login from gdm3, then--problems until HDMI cable is unseated and rebooted again. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: gdm3 3.30.1-1ubuntu5.1 ProcVersionSignature: Ubuntu 4.18.0-16.17-generic 4.18.20 Uname: Linux 4.18.0-16-generic x86_64 ApportVersion: 2.20.10-0ubuntu13.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sat Mar 16 13:50:52 2019 InstallationDate: Installed on 2019-03-07 (8 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3) SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1820423/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
