Windows 11 Hp ((exclusive)) — Synaptics Hd Audio Driver

1. Executive Summary Affected Component: Synaptics HD Audio Driver ( synthdaudio.sys ) Common Hardware: HP laptops using Synaptics-based audio codecs (often paired with Realtek or Intel Display Audio) Primary Symptoms: No audio output, microphone not detected, crackling sound, or “Device cannot start” (Error 10 / 38) after Windows 11 upgrade or clean install.