ACPI Wake Alarm Driver - Windows 8 Service
ACPI Wake Alarm by Microsoft Corporation.
This service also exists in Windows 10 and 11.
Startup Type
| Windows 8 edition | Windows 8 | Windows 8.1 | Windows 8.1 Update 1 |
|---|---|---|---|
| Core | Manual | Manual | Manual |
| Pro | Manual | Manual | Manual |
| Enterprise | Manual | Manual | Manual |
Default Properties
| Display name: | ACPI Wake Alarm Driver |
| Service name: | acpitime |
| Type: | kernel |
| Path: | %WinDir%\System32\drivers\acpitime.sys |
| Error control: | normal |
| Group: | Extended Base |
Default Behavior
The ACPI Wake Alarm Driver service is a kernel mode driver. If ACPI Wake Alarm Driver fails to start, the error is logged. Windows 8 startup proceeds, but a message box is displayed informing you that the acpitime service has failed to start.
Restore Default Startup Type of ACPI Wake Alarm Driver
Automated Restore
1. Select your Windows 8 release and edition, and then click on the Download button below.
2. Save the RestoreACPIWakeAlarmDriverWindows8.bat file to any folder on your hard drive.
3. Right-click the downloaded batch file and select Run as administrator.
4. Restart the computer.
Note. Make sure that the acpitime.sys file exists in the %WinDir%\System32\drivers folder. If this file is missing you can try to restore it from your Windows 8 installation media.