Public bug reported:

When I open an application like Firefox, I split them into 2 windows and
place one to the left and place the other to the right. So each window
gets half of the monitor. The right window gets slow when clicking and
lags for 2 seconds. But the left window is normal. This happens to all
applications when I have 2 windows. (When 1 window only, even if I put
it to the right side of the monitor, it still works fine, no lag). Thank
you!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
Uname: Linux 5.4.0-56-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon Dec  7 19:33:24 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 450.80.02, 5.4.0-54-generic, x86_64: installed
 nvidia, 450.80.02, 5.4.0-56-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation HD Graphics 630 [8086:591b] (rev 04) (prog-if 00 [VGA 
controller])
   Subsystem: Dell HD Graphics 630 [1028:07be]
   Subsystem: Dell GP107M [GeForce GTX 1050 Mobile] [1028:07be]
InstallationDate: Installed on 2020-06-23 (167 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0cf3:e301 Qualcomm Atheros Communications 
 Bus 001 Device 002: ID 2f68:0082 Hoksi Technology DURGOD Taurus K320
 Bus 001 Device 004: ID 0c45:6713 Microdia Integrated_Webcam_HD
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 15 9560
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-generic 
root=UUID=30757229-adcc-4567-bf22-0a375e36d51d ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/21/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.20.0
dmi.board.name: 0JHP5H
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.20.0:bd07/21/2020:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn0JHP5H:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.14.1+20.04.20200211-0ubuntu1
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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


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

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1907189

Title:
  Xorg freeze when split screen

Status in xorg package in Ubuntu:
  New

Bug description:
  When I open an application like Firefox, I split them into 2 windows
  and place one to the left and place the other to the right. So each
  window gets half of the monitor. The right window gets slow when
  clicking and lags for 2 seconds. But the left window is normal. This
  happens to all applications when I have 2 windows. (When 1 window
  only, even if I put it to the right side of the monitor, it still
  works fine, no lag). Thank you!

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
  Uname: Linux 5.4.0-56-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.11-0ubuntu27.13
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Dec  7 19:33:24 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus:
   nvidia, 450.80.02, 5.4.0-54-generic, x86_64: installed
   nvidia, 450.80.02, 5.4.0-56-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation HD Graphics 630 [8086:591b] (rev 04) (prog-if 00 [VGA 
controller])
     Subsystem: Dell HD Graphics 630 [1028:07be]
     Subsystem: Dell GP107M [GeForce GTX 1050 Mobile] [1028:07be]
  InstallationDate: Installed on 2020-06-23 (167 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0cf3:e301 Qualcomm Atheros Communications 
   Bus 001 Device 002: ID 2f68:0082 Hoksi Technology DURGOD Taurus K320
   Bus 001 Device 004: ID 0c45:6713 Microdia Integrated_Webcam_HD
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 15 9560
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-generic 
root=UUID=30757229-adcc-4567-bf22-0a375e36d51d ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/21/2020
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.20.0
  dmi.board.name: 0JHP5H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.20.0:bd07/21/2020:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn0JHP5H:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9560
  dmi.product.sku: 07BE
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.14.1+20.04.20200211-0ubuntu1
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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