Microsoft 1.1 UAA Function Driver for High Definition Audio Service (HdAudAddService) Defaults in Windows 11
Default Settings
| Startup type: | Manual |
| Display name: | Microsoft 1.1 UAA Function Driver for High Definition Audio Service |
| Service name: | HdAudAddService |
| Service type: | kernel |
| Error control: | normal |
| Path: | %SystemRoot%\System32\drivers\HdAudio.sys |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HdAudAddService |
Default Behavior
Microsoft 1.1 UAA Function Driver for High Definition Audio Service is a kernel driver. In Windows 11 it starts only if the user, an application or another service starts it. If Microsoft 1.1 UAA Function Driver for High Definition Audio Service fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the HdAudAddService service startup failure.
Restore Default Startup Configuration of Microsoft 1.1 UAA Function Driver for High Definition Audio Service
1. Run the Command Prompt as an administrator.
2. Copy the command below, paste it into the command window and press ENTER:
sc config HdAudAddService start= demand
3. Close the command window and restart the computer.
The HdAudAddService service is using the HdAudio.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 11 installation media.