https://bugs.kde.org/show_bug.cgi?id=522447
Bug ID: 522447
Summary: Laptop brightness keys incorrectly apply software
brightness to external monitor, causing washed-out,
greyish image.
Classification: Plasma
Product: KScreen
Version First 6.7.0
Reported In:
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
On my dual monitor setup:
My Laptop brightness keys work correctly for the Laptop internal display
monitor,
But the problem is that they also Wrongly affects the my Dell Alienware
external monitor, making the colors grey and washed-out, when turning the
bringtness down from my keyboard.
On Gnome, Cinnamon, Xfce and Windows, brightness keys only affect my laptop
monitor like it should, but on KDE, it spoiling the colors of my external
monitor, when turning down the brightness.
This issue prevents me from using Plasma in my current workflow, as I
frequently adjust my laptop brightness while using an external monitor
OBSERVED RESULT: the external monitor becomes gray, washed out, and desaturated
instead of simply dimmer, suggesting KDE is applying an incorrect software
brightness effect rather than controlling the monitor's hardware backlight.
EXPECTED RESULT
External monitor brightness should not change when using the laptop brightness
keys (matching Windows, GNOME, Cinnamon, Xfce).
STEPS TO REPRODUCE
1. Turn the brightness all the way down while having two monitors connected to
OS (to help see this problem easily)
2. Observe the grey washout colors on one monitor, vs manually turning down the
brightness from your monitor and seeing a normal less bring screen with colors.
SOFTWARE/OS VERSIONS
KDE Plasma Version: Latest version shipped on 28 June, i wiped the partition
till this get fixed, so forgot what it was.
KDE Frameworks Version: Latest version shipped on 28 June
Qt Version: Latest version shipped on 28 June
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