Monitor HDMI / DisplayPort audio device disappears after computer sleep
The high-definition audio controller (NVIDIA High Definition Audio or AMD Audio Device) fails to re-detect the monitor audio sink after resuming from a low-power PCIe sleep state.
Internal desktop parts run on harmless 12V DC voltage and cannot shock you. Simply unplug the wall power cable first, then touch the unpainted metal case frame to ground static electricity.
Common Symptoms & Tells
- Computer sound switches to internal motherboard speaker or cuts out completely after wake
- Monitor built-in speakers or headphone jack missing from Windows sound devices list
- Restarting the computer restores the monitor audio device immediately
Interactive Fix Checklist
0 of 4 steps completedRestart the Windows Audio service in services.msc
Press Win + R, type 'services.msc', scroll to 'Windows Audio', right-click and choose 'Restart'. This forces Windows to rescan connected audio sinks without rebooting.
Disable and re-enable the display audio controller in Device Manager
Open Device Manager > Sound, video and game controllers > Right-click 'NVIDIA High Definition Audio' or 'AMD High Definition Audio Device' > Disable device > wait 3 seconds > Enable device.
Perform clean GPU driver installation with HD Audio component checked
Run the latest graphics driver installer. Choose 'Custom (Advanced)', ensure the 'HD Audio Driver' checkbox is selected, and check 'Perform a clean installation'.
Toggle monitor input selection button
Using the physical buttons on your monitor, cycle the input from to and back to . This forces a fresh hot-plug detection (HPD) handshake with the audio controller.
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