Audio is important in games, your Realtek driver / software is most likely outdated... motherboard manufacturers suck at updating it - Realtek UAD generic is the best way to stay up to
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Stereo Only in Sound Settings for HDMI via Intel iGPU in Windows 10 - Microsoft Community
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Realtek HD Audio low and bad quality sound after Windows 10 upgrade - Super User
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HDMI monitor problems with on-board HD4000 graphics
Stereo Only in Sound Settings for HDMI via Intel iGPU in Windows 10 - Microsoft Community
No sound on HDMI Ubuntu 20.04 - Ask Ubuntu
4 Signs and Symptoms of a Bad HDMI Cable – With Fixes!
Fixing Resolution of HDMI Output on PC | Graphics Driver Problems
No audio over HDMI (Intel HD Graphics 3000 - i5-2600k's GPU) Windows 10 Forums
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HDMI audio output not working with fresh install of Windows 8 and Intel HD graphics, please help! | TweakTown
No audio over HDMI (Intel HD Graphics 3000 - i5-2600k's GPU) Windows 10 Forums
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SOLVED: NVIDIA High Definition Audio No Sound Issue - YouTube