https://bugs.kde.org/show_bug.cgi?id=488839
Bug ID: 488839
Summary: Zooming into a desktop will cause screens with colour
profiles to appear with distorted colours when they
spill over onto other displays
Classification: Plasma
Product: kwin
Version: 6.0.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: eamonn...@protonmail.com
Target Milestone: ---
SUMMARY
The title of this issue is awful, I am sorry I could not phrase it better...
When you have multiple displays and zoom in with "Meta+=" (Meta key and Equals
key without shift held down) to, say, a window centered on one of them. Parts
of other displays' content will spill onto other displays, because you're
zooming in. That part is not a bug.
However on a screen that has an ICC colour profile set up, the screen itself
looks fine, but the contents of that screen that expand and spill onto other
displays when you zoom in, are very visually distorted. Disabling the colour
profile fixes this issue.
Similarly, if content from displays that do not have an ICC colour profile
spill onto the display with the ICC profile, they will use incorrect colours as
well (in my case, too dark).
STEPS TO REPRODUCE
1. Have multiple displays, with at least one having an iCC colour profile set
up.
2. Zoom into your displays.
3. When you zoom in and parts of the display with an ICC profile spill onto
other displays, the contents will have distorted colours. The content on the
display with the ICC profile itself looks fine, it's when the contents goes
onto other displays that it looks wrong.
4. Disable ICC profile for that display.
5. The bug goes away.
OBSERVED RESULT
Zooming in when one display has a colour profile, the colours on the content
that spills onto other displays will look wrong.
EXPECTED RESULT
Colours should look correct when zoomed display contents overlaps between
displays that do and don't have ICC profiles
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.9.5 Linux Zen
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
ADDITIONAL INFORMATION
- I believe this issue is exclusive to Wayland, as only the Wayland session
offers setting an ICC profile? If there is a way to do this on X11 I have not
tried and don't know if it replicates this bug.
- I have not tested what happens when two displays have two colour profiles,
however I could test that if required (I can plug a laptop which has a profile
into one of my PC displays).
- I did not know this zoom effect existed until earlier today, so I am unsure
when this began. It might have been a problem since ICC profile selection was
introduced in Plasma 6.
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