** Tags added: bandwidth

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https://bugs.launchpad.net/bugs/1929209

Title:
  [i915] external monitor goes black for several seconds at a time,
  randomly

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  At times it is completely debilitating; at other times it does not happen for 
hours.
  The physical connections are clean and solid.

   I guess the attachments will show that I'm using Intel graphics
  hardware.  The monitor is a very popular Samsung one.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-73.82-generic 5.4.106
  Uname: Linux 5.4.0-73-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.17
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Thu May 20 16:56:04 2021
  DistUpgraded: 2020-06-01 15:46:34,953 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: focal
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 6.1.16, 5.4.0-73-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation HD Graphics 5500 [8086:1616] (rev 09) (prog-if 00 [VGA 
controller])
     Subsystem: Lenovo HD Graphics 5500 [17aa:5036]
  InstallationDate: Installed on 2019-01-24 (847 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.3)
  MachineType: LENOVO 20BXCTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-73-generic 
root=UUID=a6081f39-700f-4698-bda4-464e53d9d229 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to focal on 2020-06-01 (353 days ago)
  dmi.bios.date: 09/13/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET66WW (1.30 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  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:bvrJBET66WW(1.30):bd09/13/2017:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T450s
  dmi.product.name: 20BXCTO1WW
  dmi.product.sku: LENOVO_MT_20BX_BU_Think_FM_ThinkPad T450s
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 20.2.6-0ubuntu0.20.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.2
  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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