Public bug reported:

When debugging UI Applications, this application becomes naturally
unresponsive when reaching an execution breakpoint. As a consequence, I
see the "Force Quit or Wait" dialog, which freezes the whole desktop. I
have no idea why that is, but it is super annoying.

And this is of course not only the case when debugging, but happens as well for 
a "normal" application freeze. Why does a frozen application should immediately 
require my attention, no matter what else I am doing? Why does this require my 
whole desktop to freeze and wait for my input? 
Sometimes I just notice a desktop freeze and dont know whats going on until I 
find this stupid "Quit or Wait" dialog. Super annoying.
Please make this window not freeze everything else, nothing is so important 
that the whole desktop should freeze to force input.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 29 10:00:02 2018
DistUpgraded: 2018-08-22 12:49:08,163 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: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation HD Graphics 530 [8086:191b] (rev 06) (prog-if 00 [VGA 
controller])
   Subsystem: Lenovo HD Graphics 530 [17aa:222e]
 NVIDIA Corporation GM107GLM [Quadro M1000M] [10de:13b1] (rev a2) (prog-if 00 
[VGA controller])
   Subsystem: Lenovo GM107GLM [Quadro M1000M] [17aa:222e]
InstallationDate: Installed on 2017-12-15 (256 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
MachineType: LENOVO 20EQS00600
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-33-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to bionic on 2018-08-22 (6 days ago)
dmi.bios.date: 06/28/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1EET69W (1.42 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20EQS00600
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN1EET69W(1.42):bd06/28/2017:svnLENOVO:pn20EQS00600:pvrThinkPadP50:rvnLENOVO:rn20EQS00600:rvrNODPK:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad P50
dmi.product.name: 20EQS00600
dmi.product.version: ThinkPad P50
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
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
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
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

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic false-gpu-hang freeze ubuntu

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https://bugs.launchpad.net/bugs/1789577

Title:
  An Unresponsive Window Freezes the Whole Desktop

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