Any ideas what might be up with my PS4 Pro Setup - Graphical issue

stoofa

stoofa

stoofa

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So I had an issue with "sparkles" appearing on the screen whenever I had both 4K & HDR output from my PS4 Pro. I found that if I switched 4k off they vanished.
Assuming a cable problem I replaced my HDMI cables with certified premium ones and everything has been fine for about a month.
No issues, full 4k/HDR goodness. Just been playing Knack for a couple of hours and the screen looked "dirty". Exited game, bought up a dark theme and the sparkles are back.

https://youtu.be/-ZnlgKoVYUk

Any ideas what this might be?
I'm going PS4 Pro via Certifed Premium cable to Yamaha RXV581 to Sony XE9305 via certified premium HDMI cable.
Port 3 on the TV and the Yamaha HDMI ports are correctly set to Mode 1.
 
OK, slight update. I posted the issue in a couple of places and then continued my research - like to hit the knowledge of the masses as I try and solve it myself :)
So, I read on a forum that the "Automatic" settings on a PS4 Pro can be problematic. Certainly not everybody, but a few people have reported that setting to automatic can cause issues and looking at some other videos posted, I saw at least one looking very similar to mine.
So, went into display settings on the PS4 Pro and changes everything from Automatic to manual and put in the settings:
2160P YUV420
RGB Range Limited
HDR Auto
Deep Colour Auto
As soon as I put those settings in the screen refreshed and all sparkles had gone. I rebooted the PS4 Pro a number of times, fired up 4k/HDR games and they are all displaying as they should, in 4k and the HDR flag is appearing on the TV.
As a test I manually set the display to 2160P RGB and we had the sparkles back. Changed to RGB Range Full and the sparkles increased ten fold.
So a day of testing so far and the sparkles haven't re-appeared so long as I'm using the manual settings above.
 
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