Can’t figure out 5.1 surround over HDMI eARC out of my ThinkCentre M720q

Troubleshooting 5.1 Surround Sound Over HDMI eARC from Lenovo ThinkCentre M720q: A Guide

If you’ve been struggling to set up 5.1 surround sound output via HDMI eARC on your Lenovo ThinkCentre M720q Tiny desktop, you’re not alone. Many users encounter hurdles when trying to configure their systems for immersive audio, especially when using adapters and converting between different audio and video standards. This article aims to clarify common issues and provide actionable solutions for achieving 5.1 surround sound on your setup.

Understanding the Setup

Scenario Overview:
– Desktop: Lenovo M720q Tiny (Windows 10)
– Connection to TV: DisplayPort 1.2 to HDMI 2.0 adapter (Insignia-branded)
– TV: TCL 4K Google TV
– Soundbar: Vizio 5.1 with HDMI eARC support

Issue Summary:
Despite connecting everything, Windows reports only stereo (2-channel) audio, even though the hardware and connections suggest 5.1 should be possible.

Common Challenges and Clarifications

1. DisplayPort 1.2 and HDMI 2.0 Compatibility:
   While DisplayPort 1.2 theoretically supports 5.1 channels for audio, the actual support depends heavily on the display adapter being used. Not all DisplayPort-to-HDMI adapters carry audio and support the full bandwidth needed for 5.1 surround sound.

2. Adapter Limitations:
   Many passive or simple adapters convert only video signals, neglecting audio. Even active adapters vary in quality and capabilities. Verify that your adapter explicitly supports audio transmission at the desired resolution and surround sound formats.

3. Windows Audio Driver and Configuration:
   The default driver—often labeled “Beyond TV (Intel Display Audio)”—may not support multichannel audio streaming. Ensuring the correct audio driver is installed and configured correctly is vital.

4. Hardware Support:
   Some integrated audio components in PCs may not support 5.1 over digital outputs without additional hardware.

Step-by-Step Troubleshooting and Solutions

1. Confirm Adapter Capabilities
2. Check if your DisplayPort to HDMI adapter supports audio output, especially at 4K resolutions and 5.1 channels.

3. If uncertain, consult the manufacturer’s specifications or consider replacing it with a high-quality active adapter designed for audio and video transmission.

4. Use a Direct HDMI Connection (If Possible)

5. If your PC has an HDMI output, this is often more reliable for audio and video transmission, including surround