SUMMARY Scrolling mouse wheel on "Brightness and color" icon in panel changes display brightness on Samsung LED monitor connected on HDMI. But once the system goes to sleep and wakes, the same doesn't work. scrolling the mouse wheel does nothing. The same works after system restart. My PC is a MSI Cubi mini PC with Intel N100 processor, using Stock OpenSuse Tumbleweed OS. Display is a Samsung 24 Inch LED monitor connected on HDMI. STEPS TO REPRODUCE 1. Scrolling the wheel on Brightness and color indicator in notification panel changes display brightness on system boot. 2. Put the PC to sleep on inactivity. 3. wake up the pc and sign-in. the brightness won't change on mouse scroll till next PC boot. OBSERVED RESULT Brightness not changing on wake from sleep EXPECTED RESULT Brightness should change on mouse scrool SOFTWARE/OS VERSIONS Linux: OpenSuse Tumbleweed latest build. Linux/KDE Plasma: OpenSuse Tumbleweed 20241113 (Tumbleweed) KDE Plasma Version: 6.2.3 KDE Frameworks Version: 6.8.0 Qt Version: 6.8.0 ADDITIONAL INFORMATION
Which Samsung monitor specifically? An Odyssey Neo G5 or G9?
Samsung Essentials S3 LED Monitor (LS24C330GAWXXL)
(In reply to Nate Graham from comment #1) > Which Samsung monitor specifically? An Odyssey Neo G5 or G9? Samsung Essentials S3 LED Monitor (LS24C330GAWXXL)
Ok, so not the bug I was thinking of, then... maybe. Curious that it's also a Samsung monitor. Maybe a whole bunch of Samsung monitors are faulty. Does the slider in the widget work? Do the brightness up/down keys on your keyboard (if they exist) work?
(In reply to Nate Graham from comment #4) >Slider for changing brightness exists and works on system boot. strangely, the brightness slider dissappears once the screen goes to sleep on inactivity and resumes after a key press on keyboard. On restarting the PC, the brightness slider appears again.
Slider for changing brightness exists and works on system boot. strangely, the brightness slider dissappears once the screen goes to sleep on inactivity and resumes after a key press on keyboard. On restarting the PC, the brightness slider appears again.
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Slider for changing brightness exists and works on system boot. strangely, the brightness slider dissappears once the screen goes to sleep on inactivity and resumes after a key press on keyboard. On restarting the PC, the brightness slider appears again. Its has been observed that the issue exists while using PC in X11 whereas the problem doesn't exist in the wayland session.
The same has been happening to me as well on 6.1 and now on 6.2.4. When I use the scroll wheel over the brightness icon, the following message appears in journalctl -f org_kde_powerdevil[23079]: org.kde.powerdevil: Adjust screen brightness step failed: no displays available to adjust I can fix/work around the issue with systemctl --user restart plasma-powerdevil.service until the system wakes up from the next sleep. FWIW, I am on Manjaro stable. My display is quite old (as is my whole machine :-). I am using a 4k DP connection $ inxi -G Graphics: Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics driver: i915 v: kernel Display: wayland server: X.org v: 1.21.1.14 with: Xwayland v: 24.1.4 compositor: kwin_wayland driver: X: loaded: intel dri: i965 gpu: i915 resolution: 3840x2160 API: EGL v: 1.5 drivers: crocus,swrast platforms: gbm,wayland,x11,surfaceless,device API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 24.2.8-arch1.1 renderer: Mesa Intel HD Graphics 4600 (HSW GT2) API: Vulkan v: 1.3.295 drivers: intel surfaces: xcb,xlib,wayland
Created attachment 176411 [details] edid info of my monitor
There are also several manjaro users reporting the same issue. Hence I'm changing the status to confirmed. Let me know if there is anything I can try to investigate the issue.
Searching the bug database I found other reported issues similar to this one. There this bug if probably a duplicate of https://bugs.kde.org/show_bug.cgi?id=482713
*** This bug has been marked as a duplicate of bug 482713 ***