764dadd78e
P3-4: ACPI S3 sleep — suspend_to_ram() method reads _S3 AML, writes PM1a_CNT with SLEEP_EN + SLP_TYPa. Gated to x86/x86_64. Applies after shutdown hardening for correct context. P3-6: ACPI battery — read_battery_status() queries _BST, read_battery_info() queries _BIF. Returns capacity/voltage data. 18/18 patches. base + base-initfs build.