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ADV7480 Production
The ADV7480 is a combined HDMI®/MHL® receiver targeted at connectivity enabled head units requiring a wired, uncompressed digital audio/video link from...
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ADV7480 on Analog.com

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[ADV7480] About laptop audio output

		
	
				

			

									
					    tatsuya_sato
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 5, 2022 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is troubleshooting an issue where audio is not output from a Windows 10 laptop to a monitor equipped with the ADV7480 HDMI receiver. The final answer suggests that the EDID supports only LPCM audio and recommends toggling the HPA line to force the PC to re-read the EDID. The sequence to toggle HPA should be executed from the HPD=H state and involves setting specific register values. The user should also verify the audio stream format being played from the laptop.
                        	    
    
                
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    Hi,
    

    We are evaluating the ADV780 product.
    

    I am checking the video/audio output by connecting the HDMI output of a Windows 10 laptop (Dynabook R73)
    

    to a monitor equipped with ADV7480.
    

    The video from the PC is output, but the audio from the PC is not output.
    

    (PC audio driver itself does not recognize)
    

    What could be the cause？
    

    For monitors without ADV7480, PC audio is output.
    

    

    Best regards.
    
			
    
			
									
		                             
                        

    
    
                                            
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