started getting infrequent system freezes with journal displaying:
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: Error queiscing libdducitl API. 1 active API calls outstanding.
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: library quiesced, ddca_close_display temporarily unavailable
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: [ 1596] Error queiscing libdducitl API. 0 active API calls outstanding.
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: org.kde.powerdevil: [DDCutilDisplay]: ddca_close_display -3032
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: [ 1596] Display redetection starting.
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: [930911] recheck thread terminating because watch thread terminated
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: [ 1596] Watch thread terminated.
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: [ 1596] Attempting to unlock display lock owned by different thread
huhti 03 16:54:52 varikonniemi-pc org_kde_powerdevil[1596]: [ 1596] Unexpected error DDCRC_LOCKED from unlock_display_by_dpath(Display_Path[/dev/i2c-5])
huhti 03 16:54:52 varikonniemi-pc kscreenlocker_greet[927812]: qt.qpa.wayland: Could not create EGL surface (EGL error 0x3000)
huhti 03 16:54:52 varikonniemi-pc kscreenlocker_greet[927812]: qt.qpa.wayland: Could not create EGL surface (EGL error 0x3000)
huhti 03 16:54:52 varikonniemi-pc kscreenlocker_greet[927812]: Failed to write to the pipe: Bad file descriptor.
huhti 03 16:55:21 varikonniemi-pc kwin_wayland[1286]: kwin_wayland_drm: The main thread was hanging temporarily!
huhti 03 16:55:21 varikonniemi-pc kwin_wayland[1286]: kwin_wayland_drm: atomic commit failed: Permission denied
huhti 03 16:55:21 varikonniemi-pc kwin_wayland[1286]: kwin_wayland_drm: atomic commit failed: Permission denied
huhti 03 16:55:22 varikonniemi-pc wireplumber[1375]: wp-device: SPA handle 'api.bluez5.enum.dbus' could not be loaded; is it installed?
huhti 03 16:55:22 varikonniemi-pc wireplumber[1375]: s-monitors: PipeWire's BlueZ SPA plugin is missing or broken. Bluetooth devices will not be supported.
huhti 03 16:55:22 varikonniemi-pc wireplumber[1375]: wp-device: SPA handle 'api.bluez5.midi.enum' could not be loaded; is it installed?
huhti 03 16:55:22 varikonniemi-pc wireplumber[1375]: s-monitors: PipeWire's BlueZ MIDI SPA missing or broken. Bluetooth not supported.
huhti 03 16:55:22 varikonniemi-pc wireplumber[1375]: pw.resource: can't create node: No such file or directory
huhti 03 16:55:22 varikonniemi-pc wireplumber[1375]: wp-node: failed to create node from factory 'spa-node-factory'
huhti 03 16:55:22 varikonniemi-pc wireplumber[1375]: s-monitors: Failed to create BLE MIDI server.
huhti 03 16:55:47 varikonniemi-pc kwin_wayland[1286]: kwin_wayland_drm: The main thread was hanging temporarily!
huhti 03 16:55:47 varikonniemi-pc kwin_wayland[1286]: kwin_wayland_drm: atomic commit failed: Permission denied
the freeze eventually recovers, and surprisingly kernel log is clean.