Thanks for the bug report.

It sounds like GNOME (in the mutter component) has frozen. When this
happens the cursor will still move because it is managed by the Xorg
process, but the screen contents are managed by the gnome-shell process.

Please try removing DisplayLink from the equation by unplugging your
dock or any other USB display adapter. Does the bug still occur using
only the laptop screen?

** Tags added: displaylink evdi

** Package changed: xorg (Ubuntu) => mutter (Ubuntu)

** Changed in: mutter (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- Xorg freeze
+ Screen freeze

-- 
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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1957181

Title:
  Screen freeze

Status in mutter package in Ubuntu:
  Incomplete

Bug description:
  When having more than one window open, e.g. Firefox and a terminal and
  then to swap between the two. The clicking with the mouse stops
  working but it still moves. For instance when I hover over text or not
  the cursor does not change. Sometimes I can still click or select text
  in the original window but the coordinates of the mouse are not where
  the cursor is displayed. Sometimes the keyboard dies too e.g. Alt+F2
  does not work. Killing XOrg (if possible) seems to revert things to a
  working state.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-92.103-generic 5.4.157
  Uname: Linux 5.4.0-92-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jan 12 15:24:16 2022
  DistUpgraded: 2020-09-07 08:54:13,457 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus:
   evdi, 1.7.0, 4.15.0-70-generic, x86_64: installed
   evdi, 1.7.0, 5.4.0-91-generic, x86_64: installed
   evdi, 1.7.0, 5.4.0-92-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Occurs more often under certain circumstances
  GpuHangStarted: Today
  GraphicsCard:
   Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA 
controller])
     Subsystem: Lenovo UHD Graphics 620 [17aa:225c]
  InstallationDate: Installed on 2019-02-13 (1063 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: LENOVO 20KGS5DU00
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-92-generic 
root=UUID=c1172559-29d0-4c7c-bfab-574068d6d5cc ro quiet 
splash,psmouse.synaptics_intertouch=1
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to focal on 2020-09-07 (492 days ago)
  acpidump: Error: command ['pkexec', '/usr/share/apport/dump_acpi_tables.py'] 
failed with exit code 126: Error executing command as another user: Request 
dismissed
  dmi.bios.date: 10/13/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N23ET75W (1.50 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20KGS5DU00
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN23ET75W(1.50):bd10/13/2020:svnLENOVO:pn20KGS5DU00:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KGS5DU00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 6th
  dmi.product.name: 20KGS5DU00
  dmi.product.sku: LENOVO_MT_20KG_BU_Think_FM_ThinkPad X1 Carbon 6th
  dmi.product.version: ThinkPad X1 Carbon 6th
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.14.1+20.04.20200211-0ubuntu1
  version.libdrm2: libdrm2 2.4.105-3~20.04.2
  version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.5
  version.libgl1-mesa-glx: libgl1-mesa-glx 21.0.3-0ubuntu0.3~20.04.5
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.2
  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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