ACPI Wake Alarm Driver - Windows 11 Service
This service also exists in Windows 10 and 8.
Startup Type
| Windows 11 version | Home | Pro | Education | Enterprise |
|---|---|---|---|---|
| 21H2 | Manual | Manual | Manual | Manual |
| 22H2 | Manual | Manual | Manual | Manual |
| 23H2 | Manual | Manual | Manual | Manual |
| 24H2 | Manual | 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 11 startup proceeds, but a message box is displayed informing you that the acpitime service has failed to start.
Restore Default Startup Type for ACPI Wake Alarm Driver
Automated Restore
1. Select your Windows 11 edition and release, and then click on the Download button below.
2. Save the RestoreACPIWakeAlarmDriverWindows11.bat file to any folder on a local drive such as SSD or a hard disk.
3. Right-click the downloaded batch file and select Properties.
4. Check the Unblock checkbox and click OK.
5. Right-click the batch file again and select Run as administrator.
6. Restart the computer to save changes.
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 11 installation media.