acpid on my system some time ago (Gentoo package:
sys-power/acpid. However each time I tried to start it it complained:
acpid: can't open /proc/acpi/event: No such file or directory
acpid requires you to enable
ACPI_PROC_EVENT, which in it’s labels states “Deprecated /proc/acpi/event support”. I really wonder why such tool only support the deprecated way to receive the ACPI events.