SUMMARY I cannot change screen brightness - it shows OSD 20 or 30% but the is no effect in changing brightness with keys or using slider in systray. Lenovo ThinkPad X1 Gen.10 SOFTWARE/OS VERSIONS Linux/KDE Plasma: 4:5.26.4-1 KDE Plasma Version: 4:5.26.4-1 KDE Frameworks Version: 5.101.0-1 Qt Version: 5.15.7-dfsg-2
Without the details it's just a guess, but is there a chance that this is the problem you face with: https://forums.developer.nvidia.com/t/brightness-on-a-lenovo-thinkpad-p52-no-longer-controllable-after-updating-nvidia-drivers-to-525-xx-series/236008? If so, it's not related to KDE at all
(In reply to Yevgeny Kosarzhevsky from comment #0) Is this still an issue for you with an up to date system running Plasma 6.3.2 or later?
๐๐งน โ ๏ธ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME. For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging. Thank you for helping us make KDE software even better for everyone!
๐๐งน This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.