Was this the previous behavior?
Which packages were added or updated before this started ?
Is power-profiles-daemon installed and if so, when was it initially added?
Read more, since it’s a complicated issue, with many factors (HW and SW).
At least:
https://wiki.archlinux.org/title/CPU_frequency_scaling#power-profiles-daemon
Also check:
https://wiki.archlinux.org/title/Display_Power_Management_Signaling
PPD issues
Post the results of your troubleshooting investigation, as proposed from the above.