On my laptop with kde org.kde.plasma.battery (battery and brightness) widget or tray icon on task bar does not work properly after system boot. When I try to change power profile or backlight of screen by this widget new value of profile/brightness will be rollbacked to old in this widget but in realy new value of profile/brightness will be saved (I see that new values were applyaed from cli for exaple powerprofilesctl) so kde org.kde.plasma.battery widget does not show realy values, but only last. If run separate org.kde.plasma.battery with plasmawindowed separate org.kde.plasma.battery works normally and shows real power profile or backlight. If restart user plasma-plasmashell.service kde org.kde.plasma.battery (battery and brightness) widget or tray icon on task bar starts work normally Operating System: Arch Linux KDE Plasma Version: 5.27.6 KDE Frameworks Version: 5.107.0 Qt Version: 5.15.10 Kernel Version: 6.1.37-1-lts (64-bit) Graphics Platform: Wayland Processors: 12 × 12th Gen Intel® Core™ i7-1255U Memory: 15.3 GiB of RAM Graphics Processor: Mesa Intel® Graphics Manufacturer: Micro-Star International Co., Ltd. Product Name: Modern 15 B12M System Version: REV:1.0
Can confirm the weird behavior when switching power profiles with widget, and restarting plasma-plasmashell.service works for me too.
This looks like a dupe of https://bugs.kde.org/show_bug.cgi?id=464996. By the way, I can confirm that restarting the plasma-plasmashell.service worked for me: `systemctl restart --user plasma-plasmashell.service`
*** This bug has been marked as a duplicate of bug 464996 ***