SUMMARY Maximum brightness is wrongly calculated after brightness has been set by low battery setting. STEPS TO REPRODUCE 1. Set Energy Saving to reduce brightness to 10 % when on low battery. 2. Set screen brightness to 40 %. 3. Wait until low battery rule kicks in and sets brightness to 10 %. 4. Plug in notebook. 5. Increase brightness to 100 %. OBSERVED RESULT At 100 % brightness screen is not as bright as it usually is. I assume 100 % now equals to 40 % brightness I had set prior low battery action. EXPECTED RESULT Brightness should be correctly applied after low battery action. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Manjaro unstable KDE Plasma Version: 5.22.0 KDE Frameworks Version: 5.82.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION I had no problem with 5.21.x. Also would it be possible to implement feature that would restore previous brightness after I connect power source after being in low battery mode? Meaning I have 40 %, low battery mode sets it to 10 %, when I connect power source, brightness is automatically set back to 40 %.
There have been a lot of improvements and bug fixes to brightness control since this report was opened. If you still are experiencing a bug, please open a new report. Thanks.