kcmshell6 kcm_powerdevilprofilesconfig The KCM is displayed but allows no input. It cannot even be closed. Similar freeze if selecting "Power Management" from within System Settings but without even displaying the KCM
Are you running a dev build that isn't installed system-wide? There's an unfortunately unavoidable issue with the Power Management KCM now requiring a matching 6.1 version of the "org.kde.powerdevil.chargethresholdhelper" KAuth helper, and whoever hasn't replaced their system's pre-existing chargethreshold helper will experience a hanging KCM. See https://community.kde.org/Plasma/Plasma_6#Known_issues for a few extra links regarding the KAuth issue (unfortunately the systemd-sysext overlay MR that would make switching easier hasn't been merged so far).
Yes, that is my setup. Thanks for the info.
Is it really so unavoidable that we can't help but to freeze the GUI?