Great!
I checked and it was only a year ago that the rest of us noticed the
problem and found a solution (including Matthew Paul Thomas, Robert
Ancell and myself).
If the problem is still occurring in 18.04 then we need to do something
about it. That something is to ensure Ubuntu ships with NO ACTIVE colour
profile, which has been the fix for all of us so far...
** Tags added: bionic
** Summary changed:
- Some applications render too dark when a 4K screen is attached.
+ Ubuntu default colour profile distorts colours on some machines (white looks
green, too dark, or under-saturated)
** Package changed: ubuntu => colord (Ubuntu)
** Changed in: colord (Ubuntu)
Status: Invalid => Confirmed
** Also affects: gnome-control-center (Ubuntu)
Importance: Undecided
Status: New
** Changed in: gnome-control-center (Ubuntu)
Status: New => Confirmed
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to colord in Ubuntu.
https://bugs.launchpad.net/bugs/1785764
Title:
Ubuntu default colour profile distorts colours on some machines (white
looks green, too dark, or under-saturated)
Status in colord package in Ubuntu:
Confirmed
Status in gnome-control-center package in Ubuntu:
Confirmed
Bug description:
Using Ubuntu 18.04.1 LTS
Running on an i7-6700k with a GTX 1080
Reproducible with nvidia-driver-396 or xserver-xorg-video-nouveau
and a single 4K screen (TV) connected via HDMI.
The issue:
Any dark content displayed by an effected application (e.g. a very dark image
or dark themed web page) is much darker than intended making it almost
unusable.
This only effects applications that are launched when the 4K screen is
connected. If i disconnect the 4K screen, launch the app via a
different 1080p monitor then reconnect the 4K screen the app remains
unaffected.
The only apps i have found so far that are effected by this are Google
Chrome and Image Viewer. That said this is only noticeable when the
app is displaying dark contend so if other apps are affected it may be
impossible to tell.
The attached screenshot uses a black to white gradient image to clearly
demonstrate the issue.
Is seems like it may be an issue with colour depth as bellow a certain
brightness it just goes strait to black.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/colord/+bug/1785764/+subscriptions
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