Windows on external monitor are inaccessible after disconnecting HDMI

Bug #1805753 reported by spm2011 on 2018-11-29
This bug affects 1 person
Affects Status Importance Assigned to Milestone
compiz (Ubuntu)

Bug Description

To reproduce:

 - Connected to 1920x1080 monitor HDMI (LG 22MC57HQ-P)
 - Dragged windows to monitor display
 - Disconnected HDMI from laptop after resuming locked session

Program windows that were on the monitor display stayed off the screen after disconnecting, could not be dragged back even with GNOME dock -> "All Windows" displaying the preview. Had to reconnect to the monitor and manually drag them back to the laptop screen.

It sounds like others have had this issue:

Expected: disconnect from external monitor detected by windowing system, always moves all windows to the active screen automatically.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: compiz 1:
ProcVersionSignature: User Name 4.15.0-39.42-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64

ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
BootLog: /dev/sda4: clean, 227526/1343488 files, 1348444/5371136 blocks
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov 28 16:10:35 2018
DistUpgraded: 2018-09-28 16:11:26,468 DEBUG icon theme changed, re-reading
DistroCodename: bionic
DistroVariant: ubuntu
 virtualbox, 5.2.10, 4.15.0-38-generic, x86_64: installed
 virtualbox, 5.2.10, 4.15.0-39-generic, x86_64: installed
EcryptfsInUse: Yes
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
   Subsystem: Dell Haswell-ULT Integrated Graphics Controller [1028:061f]
 b'org.compiz.core' b'hsize' b'2'
 b'org.compiz.core' b'active-plugins' b"['core', 'composite', 'opengl', 'wall', 'grid', 'vpswitch', 'place', 'session', 'move', 'imgpng', 'snap', 'compiztoolbox', 'regex', 'mousepoll', 'resize', 'animation', 'workarounds', 'expo', 'fade', 'scale', 'ezoom', 'unityshell', 'switcher']"
 b'org.compiz.core' b'vsize' b'2'
InstallationDate: Installed on 2018-09-12 (77 days ago)
InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
MachineType: Dell Inc. Latitude 3340
PackageArchitecture: all
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-39-generic root=UUID=1c6a1916-ac97-4bdf-8f15-14d986e621a2 ro
SourcePackage: compiz
UpgradeStatus: Upgraded to bionic on 2018-09-28 (61 days ago) 07/09/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A17
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA17:bd07/09/2018:svnDellInc.:pnLatitude3340:pvr00:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr: Latitude 3340
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

spm2011 (spm2011) wrote :
tags: added: compiz-0.9
spm2011 (spm2011) on 2018-11-30
summary: - Windows on external monitor are off main screen after disconnecting HDMI
+ Windows on external monitor are inaccessible after disconnecting HDMI
spm2011 (spm2011) wrote :

I've also noticed that after disconnecting, if I drag windows to the right, they go off the laptop screen and become inaccessible from the screen.

So it seems it isn't properly detecting that the HDMI is disconnected (from laptop)

This is an extremely annoying and astonishing usability issue.

Expected: on disconnect, windowing reset to normal primary mode, moving all windows back to the active screen

Workaround: opening Displays Settings forces reset

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