No sound when connecting PC to AVR

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27 Sep 2009
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I have my PC connected via DP to HDMI (GPU is a 3090) into my Pioneer LX55 AVR on HDMI1. I have configured the Windows 10 sound settings to use the LX55 as my only output. I have set it as 5.1 surround sound. I have set the phantom display as "extended".

My AVR says PCM HDMI1.

This sometimes works but more often then not so sound comes out my speakers. I have tried turning the PC on, then AVR, or AVR then PC.

Any help is greatly appreciated.
 
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