apport information

** Attachment added: "CRDA.txt"

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  Temporal dithering started appearing on Intel HD 530 graphics

Status in linux package in Ubuntu:

Bug description:
  I am experiencing a regression in linux-image-generic-hwe-16.04 with
  Intel HD Graphics 530 (Core i5-6600T), starting in 4.13.0-43
  (considering only kernels which appear in my GRUB menu).

  Some form of spatio-temporal dithering has been enabled. This is
  causing a shimmering effect and visible dithering patterns (like woven
  textile) which are noticeable on photographs and areas of similar
  colour. 1px borders in the UI can appear to have a "marching ants"

  The effect is visible both under Xorg and in a virtual console
  (Ctrl+Alt+F1), if the displayed colours are suitable to trigger it.

  Booting 4.13.0-41 eliminates the temporal dithering.

  This occurs on a (presumed) 6bpp laptop LCD panel, so dithering is necessary, 
but in previous kernels only a form of spatial dithering is applied, which is 
less visually obvious.
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
   /dev/snd/controlC0:  patrick    1976 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=72e179a8-b27c-42d3-9523-8f1cceacaa64
  InstallationDate: Installed on 2016-09-16 (634 days ago)
  InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
  MachineType: PC Specialist Limited N350DW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-45-generic 
root=UUID=deeef076-c1e1-47ec-8ee4-d3b56fa179f9 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.13.0-45.50~16.04.1-generic 4.13.16
   linux-restricted-modules-4.13.0-45-generic N/A
   linux-backports-modules-4.13.0-45-generic  N/A
   linux-firmware                             1.157.19
  Tags:  xenial xenial
  Uname: Linux 4.13.0-45-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lp lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: False 05/26/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.11
  dmi.board.asset.tag: Tag 12345 N350DW
  dmi.board.vendor: CLEVO
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
dmi:bvnAmericanMegatrendsInc.:bvr5.11:bd05/26/2016:svnPCSpecialistLimited:pnN350DW:pvrNotApplicable:rvnCLEVO:rnN350DW:rvrNotApplicable:cvnNoEnclosure:ct10:cvrN/A: Not Applicable N350DW
  dmi.product.version: Not Applicable
  dmi.sys.vendor: PC Specialist Limited

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