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Freezes randomly without any traceable pattern. Windows become unresponsive 
while the cursor works. 
To unfreeze I have to press the OFF button of my HP ProBook and then click on 
"Cancel" in the shutdown dialogue. That unfreezes the windows. May happen 
several times per session, may not happen at all.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 15 22:32:43 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA 
controller])
   Subsystem: Hewlett-Packard Company HD Graphics 620 [103c:822c]
InstallationDate: Installed on 2020-06-19 (26 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 004: ID 138a:003f Validity Sensors, Inc. VFS495 Fingerprint 
Reader
 Bus 001 Device 003: ID 8087:0a2a Intel Corp. 
 Bus 001 Device 002: ID 05c8:03a0 Cheng Uei Precision Industry Co., Ltd 
(Foxlink) HP HD Camera
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP ProBook 430 G4
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-40-generic 
root=UUID=36191f51-931b-47be-bfdb-1553e0425aad ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/05/2016
dmi.bios.vendor: HP
dmi.bios.version: P85 Ver. 01.03
dmi.board.name: 822C
dmi.board.vendor: HP
dmi.board.version: KBC Version 42.61
dmi.chassis.asset.tag: 5CD7065D4K
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: 
dmi:bvnHP:bvrP85Ver.01.03:bd12/05/2016:svnHP:pnHPProBook430G4:pvr:rvnHP:rn822C:rvrKBCVersion42.61:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP ProBook
dmi.product.name: HP ProBook 430 G4
dmi.product.sku: Y7Z51EA#ACB
dmi.sys.vendor: HP
version.compiz: compiz N/A
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 20.0.8-0ubuntu1~20.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1
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: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug false-gpu-hang focal freeze ubuntu
-- 
Screen freeze
https://bugs.launchpad.net/bugs/1887718
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