Screen brightness reduced after standby mode

Support Graphics & Display
1

On my desktop PC I have recently installed (better: connected) a new monitor (Samsung LU28R550UQRXEN). For quite some while everything seemed ok. After the before-last Manjaro update I noticed that, after the PC had been in standby-mode for a while, the monitor was set to 100% brightness when the PC was awaken. After the last update which I perfomed a few days ago it’s now the opposite: Whenever I awake the PC from standby mode, the monitor is set to (almost) lowest brightness (something like 3% or so - good for me would be around 60 to 70%). I need to readjust the brightness each time the PC awakes from standby mode, which is a bit annoying.

Does anyone have an idea How I can fix that? Or is it a bug which I should report?
Here is the system information:
Operating System: Manjaro Linux
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.6.58-1-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 2600 Six-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 570 Series
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7B79
System Version: 1.0

Thanks in advance.

2

You can change the settings for automatic dimming via Plasma’s System Settings => Power Management => Display and Brightness.

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3

Thank you, I could have thought of this. The option for setting the brightness was disabled, now I turned it on and we’ll see what kind of effect this has. I just noticed (wasn’t sure about it) that also when the monitor is turned off by the energy savings settings, the same behaviour applies, i.e. it sets the brightness to a different value.

4

If that doesn’t work, then disabling the “Change screen brightness” option and changing the “Dim automatically” option to “Never” should fix the issue.

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5

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