Issue is present on 4.14.0-041400-generic kernel.
Issue was present since fresh install of Ubuntu 17.04 (don't remember what 
kernel version was it). Current Ubuntu version 17.10 is upgrade from 17.04.


** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1724796

Title:
  Picture is heavily malformed

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On boot screen with disk decrypt password and gdm are heavily deformed
  (check attachment). After login wayland session is also deformed, then
  if I logout and login to Xorg, picture is fine. After that if I logout
  and login back to Wayland session picture is also fine.

  GDM -> https://imgur.com/a/MhHbd
  Disk decrypt -> https://imgur.com/a/UP0rL

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: xorg 1:7.7+19ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-16.19-lowlatency 4.13.4
  Uname: Linux 4.13.0-16-lowlatency x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 19 12:29:31 2017
  DistUpgraded: 2017-10-19 11:49:45,543 DEBUG icon theme changed, re-reading
  DistroCodename: artful
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.1.30, 4.10.0-37-generic, x86_64: installed
   virtualbox, 5.1.30, 4.13.0-16-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480] 
[1002:67df] (rev e7) (prog-if 00 [VGA controller])
     Subsystem: XFX Pine Group Inc. Ellesmere [Radeon RX 470/480/570/580] 
[1682:c580]
  InstallationDate: Installed on 2017-08-25 (54 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: ASUS All Series
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-lowlatency 
root=UUID=23900d78-4c59-4f7b-a317-4dd19bd68a7e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to artful on 2017-10-19 (0 days ago)
  dmi.bios.date: 11/11/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2801
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z97-AR
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2801:bd11/11/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ97-AR:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: ASUS MB
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS
  version.compiz: compiz 1:0.9.13.1+17.10.20170901-0ubuntu1
  version.libdrm2: libdrm2 2.4.83-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 1:17.2.2-0~z~padoka0
  version.libgl1-mesa-glx: libgl1-mesa-glx 1:17.2.2-0~z~padoka0
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20170309-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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