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[Alberto Salvia Novella <es20490446e@xxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1590650

Title:
  Noisy white turquoise shadows in colors and since Xenial

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hi,
  since the upgrade to Xenial I've had graphic issues on my NAS/HTPC box.
  All white is rendered as a noisy grey, and colors have a bunch of bright turquoise pixels.

  Back then I've reverted to the old 4.2.0-35 kernel I had before and things were fine.
  The recent update to 4.4.0-22 didn't help, so I decided it is time to debug and fix that since I don't know how much more LTS users might be affected.

  I lack experience in debugging graphical issues, what are the right next steps?
  - are there obvious extra debug information sources that might help?
  - I tried most of the common troubleshooting guides without any effect, let me know if I should tweak any i915 parms or so.
  - would it be useful to go to a Yakkety kernel, and if this fixing it bisecting from there - if so on what tree - I don't want a full Y upgrade on this box?

  I made some screenshots, but the issue is not visible there - this
  might be a hint in itself as it should imply that the error so is
  "after" the graphics buffer right?

  I'll attach the screenshots and cam shots of the same so you can see
  what I mean.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.40
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  paelzer    1918 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Thu Jun  9 07:51:07 2016
  HibernationDevice: RESUME=UUID=158370b1-2e39-4f92-b9ff-1f2fdcf63c21
  InstallationDate: Installed on 2012-04-29 (1501 days ago)
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=eacb9ac2-7523-41c7-bde4-b78a3cd3cf97 ro bootdegraded=true nosplash apm=on apm=power-off nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-05-09 (30 days ago)
  dmi.bios.date: 12/04/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0907
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8H67-I
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0907:bd12/04/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H67-I:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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