I thought of that and don't think it's similar.
The problem here sounds like nouveau is using some rather dynamic
dithering ("dynamic 2x2"??) and it would look better if more static.
Even if that means more banding.
So nouveau seems to correctly know it should use dithering. The only
remaining question would be whether it is correctly detecting 6 or 8
bpc.
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https://bugs.launchpad.net/bugs/1819023
Title:
[nouveau] Scrolling screen flicker, especially on default Ubuntu lock
screen
Status in linux package in Ubuntu:
Confirmed
Bug description:
My screen is experiencing a weird "scrolling" flicker, especially
while displaying blue, indigo, and violet hues/colors, such as on the
default Ubuntu 18.10 (x64 Desktop) lock screen. The screen flicker
scrolls up and down, with the brightest part of the flicker being
towards the top, with a gradient that fades back to the original color
near the bottom.
Problem occurs on any one monitor on any one video output protocol
(DVI-D, HDMI, and VGA).
I will upload an illustration or render as soon as possible for better
explanation.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xorg 1:7.7+19ubuntu8
ProcVersionSignature: Ubuntu 4.18.0-16.17-generic 4.18.20
Uname: Linux 4.18.0-16-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar 7 10:39:50 2019
DistUpgraded: 2018-10-19 10:50:54,557 ERROR got error from PostInstallScript
./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process
“./xorg_fix_proprietary.py” (No such file or directory) (8))
DistroCodename: cosmic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
NVIDIA Corporation GF108 [GeForce GT 440] [10de:0de0] (rev a1) (prog-if 00
[VGA controller])
Subsystem: NVIDIA Corporation GF108 [GeForce GT 440] [10de:0828]
InstallationDate: Installed on 2018-08-17 (202 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: BIOSTAR Group A880G+
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-16-generic
root=UUID=a967adb1-1600-455b-8704-e2bf5de5081d ro quiet splash vt.handoff=1
SourcePackage: xorg
UpgradeStatus: Upgraded to cosmic on 2018-10-19 (139 days ago)
dmi.bios.date: 09/21/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080016
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: A880G+
dmi.board.vendor: BIOSTAR Group
dmi.chassis.asset.tag: None
dmi.chassis.type: 3
dmi.chassis.vendor: BIOSTAR Group
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr080016:bd09/21/2011:svnBIOSTARGroup:pnA880G+:pvr:rvnBIOSTARGroup:rnA880G+:rvr:cvnBIOSTARGroup:ct3:cvr:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: A880G+
dmi.product.sku: To Be Filled By O.E.M.
dmi.sys.vendor: BIOSTAR Group
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.95-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20171229-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3
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