** Description changed:

  When I switch to any virtual terminal (TTY1-TTY6 in Xubuntu) display
  will be filled with black from bottom to up. Then text is drawn again,
  and then the same happens again. Besides the screen is flashing
  sometimes like in login screen of the DE or when I use Google Maps on
  Firefox.
+ 
+ Reproduceable: not always
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-5.0.0-25-generic 5.0.0-25.26~18.04.1
  ProcVersionSignature: Ubuntu 5.0.0-25.26~18.04.1-generic 5.0.18
  Uname: Linux 5.0.0-25-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Aug 22 09:57:13 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-01-05 (958 days ago)
  InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  SourcePackage: linux-signed-hwe
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1841029

Title:
  nouveau: display scans black from botton to top periodically and
  flashes on DE.

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