/tmp/fadt.py

tmpfadt.py

#!/usr/bin/python3
import logging
import os
import struct
def BIT(num):
    """Returns a bit shifted by num"""
    return 1 << num
def check_fadt():
    """Check the kernel emitted a message specific to 6.0 or later indicating FADT had a bit set."""
    found = False
    # try to look at FACP directly if not found (older kernel compat)
    if not found:
        logging.debug("Fetching low power idle bit directly from FADT")
        target = os.path.join("/", "sys", "firmware", "acpi", "tables", "FACP")
        try:
            with open(target, "rb") as r:
                r.seek(0x70)
                found = struct.unpack("<I", r.read(4))[0] & BIT(21)
        except PermissionError:
            print_color("FADT check unavailable", colors.WARNING)
            return True
    if found:
        message = "ACPI FADT supports Low-power S0 idle"
        print(message, "✅")
    else:
        message = "ACPI FADT doesn't support Low-power S0 idle"
        print(message, "❌")
    return found