Public bug reported:

after installing cpufreq the screen flickring and smoothness disappeared
in ubuntu .

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.11.0-38.42~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-38-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct  3 18:57:55 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation HD Graphics 5500 [8086:1616] (rev 09) (prog-if 00 [VGA 
controller])
   Subsystem: Hewlett-Packard Company HD Graphics 5500 [103c:225a]
InstallationDate: Installed on 2021-07-01 (94 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
MachineType: Hewlett-Packard HP EliteBook 820 G2
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-38-generic 
root=UUID=3a425ccf-6b17-4740-a951-62415983b2e2 ro
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/24/2015
dmi.bios.release: 1.4
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: M71 Ver. 01.04
dmi.board.name: 225A
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 96.54
dmi.chassis.asset.tag: 5CG5172BFZ
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.ec.firmware.release: 150.84
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrM71Ver.01.04:bd02/24/2015:br1.4:efr150.84:svnHewlett-Packard:pnHPEliteBook820G2:pvrA3009C510203:skuN3F11EC#AB4:rvnHewlett-Packard:rn225A:rvrKBCVersion96.54:cvnHewlett-Packard:ct10:cvr:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
dmi.product.name: HP EliteBook 820 G2
dmi.product.sku: N3F11EC#AB4
dmi.product.version: A3009C510203
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.105-3~20.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.3
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2
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

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


** Tags: amd64 apport-bug focal ubuntu

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https://bugs.launchpad.net/bugs/1945895

Title:
  screen flickring after installing cpufreq

Status in xorg package in Ubuntu:
  New

Bug description:
  after installing cpufreq the screen flickring and smoothness
  disappeared in ubuntu .

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.11.0-38.42~20.04.1-generic 5.11.22
  Uname: Linux 5.11.0-38-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.20
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Oct  3 18:57:55 2021
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation HD Graphics 5500 [8086:1616] (rev 09) (prog-if 00 [VGA 
controller])
     Subsystem: Hewlett-Packard Company HD Graphics 5500 [103c:225a]
  InstallationDate: Installed on 2021-07-01 (94 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  MachineType: Hewlett-Packard HP EliteBook 820 G2
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-38-generic 
root=UUID=3a425ccf-6b17-4740-a951-62415983b2e2 ro
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/24/2015
  dmi.bios.release: 1.4
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: M71 Ver. 01.04
  dmi.board.name: 225A
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 96.54
  dmi.chassis.asset.tag: 5CG5172BFZ
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.ec.firmware.release: 150.84
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrM71Ver.01.04:bd02/24/2015:br1.4:efr150.84:svnHewlett-Packard:pnHPEliteBook820G2:pvrA3009C510203:skuN3F11EC#AB4:rvnHewlett-Packard:rn225A:rvrKBCVersion96.54:cvnHewlett-Packard:ct10:cvr:
  dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
  dmi.product.name: HP EliteBook 820 G2
  dmi.product.sku: N3F11EC#AB4
  dmi.product.version: A3009C510203
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.105-3~20.04.2
  version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.3
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2
  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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