ACPI Wake Alarm Driver (acpitime) Service Defaults in Windows 8

ACPI Wake Alarm by Microsoft Corporation.

Default Settings

Startup type: Manual
Display name:ACPI Wake Alarm Driver
Service name:acpitime
Service type:kernel
Error control:normal
Group:Extended Base
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\acpitime

Default Behavior

The ACPI Wake Alarm Driver service is a kernel device driver. In Windows 8 it will not be started until the user starts it. If ACPI Wake Alarm Driver fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the acpitime service hasn't been started.

Restore Default Startup Configuration of ACPI Wake Alarm Driver

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config acpitime start= demand

3. Close the command window and restart the computer.

The acpitime service is using the acpitime.sys file that is located in the C:\Windows\System32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 8 installation media.