I decided I add the tag: 'kernel-fixed-upstream', because I couldn't
reproduce it when I tested it 2nd and 3rd time for minutes.

** Tags added: kernel-fixed-upstream

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https://bugs.launchpad.net/bugs/1777238

Title:
  video lag

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The problem exists for months and I didn't find a good answer on it.
  It affects many softwares: Cheese, Super Tux Cart, VLC (when I rewind
  the video the sounds continues, but the video stops), youtube,
  Hangouts and every software where video is played.

  I experienced that there are 2 things that can break it:
   - if I move the mouse out and in on the affected window (it doesn't work in 
full screen)
   - if I open the system monitor, the problem also disappears

  other people also face with this problem:
  
https://unix.stackexchange.com/questions/447696/ubuntu-16-04-18-04-video-playback-lags-stutters
  
https://askubuntu.com/questions/1032035/ubuntu-18-04-budgie-desktop-video-lag-youtube-twitch-in-chrome
  
https://askubuntu.com/questions/1030074/my-video-player-in-ubuntu-18-04-lts-lags/1030194
  https://askubuntu.com/questions/1030155/youtube-video-lag-on-18-04

  Ubuntu 4.15.0-23.25-generic 4.15.18
  it was upgraded from 16.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: cheese 3.28.0-1ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jun 16 14:34:26 2018
  ExecutablePath: /usr/bin/cheese
  InstallationDate: Installed on 2016-08-04 (680 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  MachineType: Dell Inc. Latitude E5440
  RelatedPackageVersions:
   cheese        3.28.0-1ubuntu1
   cheese-common 3.28.0-1ubuntu1
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-04-02 (74 days ago)
  dmi.bios.date: 05/01/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 009TY8
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd05/01/2014:svnDellInc.:pnLatitudeE5440:pvr01:rvnDellInc.:rn009TY8:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  vandor     3436 F.... pulseaudio
   /dev/snd/controlC1:  vandor     3436 F.... pulseaudio
   /dev/snd/controlC0:  vandor     3436 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=b5a3c617-9443-458f-92a3-63eea1f57d5c
  InstallationDate: Installed on 2016-08-04 (681 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  MachineType: Dell Inc. Latitude E5440
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=38affd30-88f0-4a36-b9ae-6b5c210844b4 ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware                             1.173.1
  Tags:  bionic
  Uname: Linux 4.15.0-23-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2018-04-02 (74 days ago)
  UserGroups: adm bumblebee cdrom dip docker libvirt libvirtd lpadmin mail 
plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/01/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 009TY8
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd05/01/2014:svnDellInc.:pnLatitudeE5440:pvr01:rvnDellInc.:rn009TY8:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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