https://bugs.kde.org/show_bug.cgi?id=501670
Bug ID: 501670
Summary: KDE randomly connects external display either using
RGB or YCBCR420 colorspace
Classification: Plasma
Product: KScreen
Version: 6.3.0
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: sergeidani...@gmail.com
Target Milestone: ---
Created attachment 179523
--> https://bugs.kde.org/attachment.cgi?id=179523&action=edit
YCBCR420 picture
I'm using LG C2 TV as monitor with KDE Plasma 6.3
My Lenovo X1 carbon Gen9 laptop allows using it with 4K@120HZ over type C with
cable matters typec->hdmi adapter.
Half of time KDE connects to the monitor using RGB 8 bit , which is looking
totally fine.
But another half connects with YCBCR420 8bit , which provides bad rainbow
effect and makes text unreadable.
The fact it there is no consistency makes me puzzled that that color space
selection is not really controlled.
I checked on Windows 11, it consistenly using RGB 8bit, so problem is specific
to Linux.
Problem is reproduced only with 4K@120HZ, 4K@60HZ Consistently using RGB.
Hardware:
Lenovo X1 carbon Gen9
cable matters typec->hdmi 4k 120Hz adapter
LG C2 42" as monitor
Software:
Debian 12 Testing
Kde Plasma 6.3 Wayland (But also was present with 5.27)
Qt 6.7.2
Kernel 6.12
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