Public bug reported:
I opened "System Settings" -> "Displays" (in order to restore my usual settings
which had been reset because of bug 1671522).
I changed some settings (namely selected the laptop's built-in monitor and
turned it off, leaving the external monitor turned on) and clicked Apply.
I'm not sure whether the issue (see below) happened at the stage or after the
following:
I didn't click "keep current settings" in the popup, so the old settings were
restored after 30 seconds (maybe I didn't see the popup because the issue had
already happeded).
The issue is that now, even though the Display settings window was still
open (I hadn't closed it, its icon was still in the Launcher, and the
monitor identifier strings were displayed on the top-left corner of each
monitor), it wasn't visible anywhere and I couldn't access it in any
way.
Clicking on the window's icon on Launcher did not show the window and
bring it to front. Hitting Alt+TAB and selecting the window would not
show it. Hitting Ctrl+Super+D twice did nothing. Minimizing every other
window did not reveal the window. There was just NO WAY of making the
window visible and access it. I had to close it by right-clicking its
laucher icon and selecting "quit", and then re-launch it.
Absolutely ridiculous. I'm pretty sure I have seen this happen other
times randomly with other unrelated windows, usually (I think) with
stuff like popups and the like (but now it seems it can happen with any
kind of window, as in this case). It's not something that happens often,
though.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160906-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
Uname: Linux 4.4.0-64-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory:
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
NVRM version: NVIDIA UNIX x86_64 Kernel Module 340.101 Thu Dec 1 15:52:31
PST 2016
GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)
.tmp.unity_support_test.0:
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
BootLog:
[[0;32m OK [0m] Started LSB: Speech Dispatcher.
[[0;32m OK [0m] Started LSB: Set the CPU Frequency Scaling governor to
"ondemand".
[[0;32m OK [0m] Started LSB: daemon to balance interrupts for SMP systems.
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Thu Mar 9 16:32:26 2017
DistUpgraded: 2016-12-11 22:45:13,519 ERROR got error from PostInstallScript
./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process
"./xorg_fix_proprietary.py" (No such file or directory) (8))
DistroCodename: xenial
DistroVariant: ubuntu
DpkgLog:
GraphicsCard:
Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev
09) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics
Controller [1025:0647]
NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
InstallationDate: Installed on 2013-10-11 (1244 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Acer Aspire V3-571G
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-64-generic.efi.signed
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to xenial on 2016-12-11 (87 days ago)
dmi.bios.date: 10/15/2012
dmi.bios.vendor: Acer
dmi.bios.version: V2.07
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: VA50_HC_CR
dmi.board.vendor: Acer
dmi.board.version: Type2 - Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.07
dmi.modalias:
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
dmi.product.name: Aspire V3-571G
dmi.product.version: V2.07
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Thu Mar 9 16:21:28 2017
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
NVIDIA(0): Failed to initiate mode change.
NVIDIA(0): Failed to complete mode change
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.2
** Affects: unity (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1671529
Title:
"Displays" settings window went "missing" and there was no way to
access it (though still open)
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