Per OP comment, this isn't chromium-specific (gnome image viewer also affected).
Re-targetting the bug at unity.

** Package changed: chromium-browser (Ubuntu) => unity (Ubuntu)

** Summary changed:

- Very dark chromium interface and pages when hardware acceleration is enabled
+ Very dark interface when launcher on secondary monitor

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https://bugs.launchpad.net/bugs/1754394

Title:
  Very dark interface when launcher on secondary monitor

Status in unity package in Ubuntu:
  New

Bug description:
  I switched back to FF when Quantum came out, this is why I hadn't
  realised this until today that I had to use hangouts in Chromium.

  For some reason, it's like gamma for the Chromium windows is dialled
  almost all the way down when hardware acceleration is enabled. Please
  see screenshots. The "chromium-no-hw-accel.png" screenshot shows the
  same colours as Firefox and Qupzilla.

  I've since tried on other browsers using chromium to the same effect:
    * Google Chrome 65.0.3325.146
    * Opera 51.0.2830.55
    * Chromium 64.0.3282.167-0ubuntu0.17.10.1 (as per bug report).

  This happens on intel HD630 graphics. I have a bumblebee/bbswitch set
  up but it seems unable to boot Chromium at all with HW on.

  I haven't been able however to see the same stuff on Electron apps
  though (VS Code and Slack).

  My setup:

    * XPS 9560
    * Bumblebee / bbswitch set up
    * i7-7700HQ / Intel HD630
    * Ubuntu 17.10
    * Unity 7
    * Kernel 4.13.0-36-generic

  ~ cat /usr/share/X11/xorg.conf.d/20-intel.conf

  Section "Device"
     Identifier "Intel Graphics"
     Driver "intel"
     Option "AccelMethod" "sna"
     Option "TearFree" "true"
     Option "DRI" "3"
  EndSection

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: chromium-browser 64.0.3282.167-0ubuntu0.17.10.1
  ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
  Uname: Linux 4.13.0-36-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity:Unity7:ubuntu
  DRM.card0-DP-1:
   enabled: enabled
   dpms: On
   status: connected
   edid-base64: 
AP///////wAQrG2gVVZUMB8VAQMONR546rsEoVlVnigNUFSlSwBxT4GA0cABAQEBAQEBAQEBAjqAGHE4LUBYLEUAEyshAAAeAAAA/wBOUlBQNTE3VTBUVlUKAAAA/ABERUxMIFAyNDExSAogAAAA/QA4TB5TEQAKICAgICAgABQ=
   modes: 1920x1080 1280x1024 1280x1024 1152x864 1024x768 1024x768 800x600 
800x600 640x480 640x480 720x400
  DRM.card0-DP-2:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-HDMI-A-1:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-HDMI-A-2:
   enabled: disabled
   dpms: Off
   status: disconnected
   edid-base64: 
   modes:
  DRM.card0-eDP-1:
   enabled: enabled
   dpms: On
   status: connected
   edid-base64: 
AP///////wBNEHYUAAAAADEaAQSlIxN4DmYap1Q0vCULS1cAAAABAQEBAQEBAQEBAQEBAQEBTdAAoPBwPoAwIDUAWsIQAAAYAAAAAAAAAAAAAAAAAAAAAAAAAAAA/gBZMlhORIBMUTE1NkQxAAAAAAACQQMoABIAAAsBCiAgAAY=
   modes: 3840x2160
  Date: Thu Mar  8 16:08:08 2018
  Desktop-Session:
   'unity'
   
'/etc/xdg/xdg-unity:/etc/xdg/xdg-unity:/etc/xdg:/usr/share/kubuntu-default-settings/kf5-settings'
   
'/home/luis/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share/:/usr/share/unity:/usr/share/unity:/home/luis/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share:/var/lib/snapd/desktop'
  DetectedPlugins:
   
  Env:
   'None'
   'None'
  InstallationDate: Installed on 2017-11-30 (97 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  Load-Avg-1min: 0.34
  Load-Processes-Running-Percent:   0.1%
  MachineType: Dell Inc. XPS 15 9560
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-36-generic.efi.signed 
root=UUID=979f134e-10a9-41ac-86cb-67c1e8295aaf ro quiet splash 
acpi_rev_override=5 pci=nommconf vt.handoff=7
  SourcePackage: chromium-browser
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.7.1
  dmi.board.name: 05FFDN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.7.1:bd01/25/2018:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9560
  dmi.sys.vendor: Dell Inc.
  etcconfigcpepperflashpluginnonfree:
   flashso="/usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so"
   flashversion=`strings $flashso 2> /dev/null | grep LNX | cut -d ' ' -f 2 | 
sed -e "s/,/./g"`
   CHROMIUM_FLAGS="$CHROMIUM_FLAGS --ppapi-flash-path=$flashso 
--ppapi-flash-version=$flashversion"
  modified.conffile..etc.default.chromium-browser: [deleted]

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