Public bug reported:

- Ubuntu 18.04 (with updates as of 14 Feb 2018).
- Laptop: Asus Zenbook UX303
- CPU: Intel i5 4210U
- Graphics: Intel HD 4400

Problem description: Colour artefacts and banding in all apps. Graphics,
photos and videos display as though the colour range is improperly

See this photo of a 1080p video taken with a camera (poor quality, but
illustrates the issue): https://ubuntucommunity.s3-us-

Look at the sky’s light colours. They display with smooth gradients on
Ubuntu 16.04, but as the photo illustrates 18.04 seems to display the
video with a smaller range of white colours. This is the most apparent
with either very dark or very light colours. Even on window titlebars
the banding is visible (displayed as lines with different shades of

Compared with a PrtSc shot of the same image:

The artefacts are not present on PrtSc shots that are taken on Ubuntu
18.04 but viewed on a different system (16.04 and Windows).

Installing a previous kernel version fixes the issue completely. I used
UKUU Update Utility to install kernel 4.4 (the same that I use in Ubuntu
16.04 without issues) and upon a reboot with 4.4 running on 18.04
everything displayed smoothly. So this indicates that the system might
be using a sub-optimal colour depth with the newer kernel?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.13.0-32-generic 4.13.0-32.35 [modified: 
ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
 /dev/snd/controlC0:  ystein     1344 F.... pulseaudio
 /dev/snd/controlC1:  ystein     1344 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Feb 14 11:25:43 2018
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=d0bae648-a4d8-454c-b9fc-4cc04874d6c1
InstallationDate: Installed on 2018-02-12 (1 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180210)
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 8087:07dc Intel Corp. 
 Bus 001 Device 003: ID 064e:9700 Suyin Corp. Asus Integrated Webcam
 Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed 
root=UUID=25279d7b-cc8a-4fee-9088-cfc69607cbca ro quiet splash vt.handoff=1
 linux-restricted-modules-4.13.0-32-generic N/A
 linux-backports-modules-4.13.0-32-generic  N/A
 linux-firmware                             1.170
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install) 09/01/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX303LA.204
dmi.board.asset.tag: ATN12345678901234567 UX303LA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrUX303LA.204:bd09/01/2014:svnASUSTeKCOMPUTERINC.:pnUX303LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX303LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: UX UX303LA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  Colour banding and artefacts appear system-wide on an Intel HD
  Graphics 4400 system

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