Ubuntu 18.04
/proc/acpi/wakeup 記錄了各 device 支援的 ACPI wakeup 狀態 (S0/S3/S4/S5)，以及 wakeup function 是否啟動 (enabled/disabled)：
$ cat /proc/acpi/wakeup Device S-state Status Sysfs node EHC1 S3 *enabled pci:0000:00:1d.0 EHC2 S3 *enabled pci:0000:00:1a.0 HDEF S0 *disabled pci:0000:00:1b.0 RP01 S0 *disabled pci:0000:00:1c.0 WLAN S0 *disabled pci:0000:02:00.0 RP02 S0 *disabled pci:0000:00:1c.1 RMSC S0 *disabled pci:0000:03:00.0 *disabled platform:rtsx_pci_sdmmc.0 *disabled platform:rtsx_pci_ms.0 RP03 S3 *disabled pci:0000:00:1c.2 NXUC S3 *disabled pci:0000:04:00.0 RP04 S3 *disabled pci:0000:00:1c.3 RLAN S3 *enabled pci:0000:05:00.0 PEG0 S0 *disabled pci:0000:00:01.0 PEGP S0 *enabled pci:0000:01:00.0