I can confirm that the temporal dithering is present when running
mainline kernel 4.17.0-041700-generic.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1776642
Title:
Temporal dithering started appearing on Intel HD 530 graphics
Status in linux package in Ubuntu:
Confirmed
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"
effect.
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.
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ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/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
(20160719)
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
RelatedPackageVersions:
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
dmi.bios.date: 05/26/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5.11
dmi.board.asset.tag: Tag 12345
dmi.board.name: 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.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr5.11:bd05/26/2016:svnPCSpecialistLimited:pnN350DW:pvrNotApplicable:rvnCLEVO:rnN350DW:rvrNotApplicable:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: N350DW
dmi.product.version: Not Applicable
dmi.sys.vendor: PC Specialist Limited
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