After booting into Linux kacpid is constantly using 100% CPU and ACPI interrupt is firing at ~10k/s.
My test environment is Optiplex 9010 with i5-3470 with dual channel DDR3 and an Nvidia GTX1650 installed as DGPU, running Fedora 32.
Coreboot logs and Linux dmesg is attached below. Captured with a build of earlier master but still reproducible on the latest master.