Originally Posted by alfa1
Here is the screenshot you asked for, any suggestions would be appreciated!
Sorry I just realized that you posted same screenshot before, I missed it.
Ok, here is what I would try for ATV 4K output:
Flash firmware 0.25 on Linker.
Once flashed, Hold RST button and press INP button 6 times to set the unit for 1080p deep color display.
Reselect EDID 4 from custom EDID list using GUI or APP (make sure your GoBlue is running latest firmware if you do it from APP)
Make sure HDCP is set to 1.4
Then try again in your setup and make sure to restart ATV to get full proper edid read at startup.
If ATV now output 4K (please take INFO page screenshot if it's the case), then try again with, your other source to make sure it still work with them as well (sync should be faster with FW0.25)
Now regarding Dolby Atmos from ATV4K running latest FW, problem is may be not with your AVR but with Linker, since Linker only support Atmos over DD+ or TrueHD, but in reality it could be with both devices, Linker and your AVR.
However, ATV4K should offer the ATMOS option in its menu.
So we don't know yet if Apple will correct this new way of sending Atmos out as it is creating lot of issues for lot of people, so if enough are complaining they might consider adding option to output Atmos over MAT or TrueHD in the future.
In such case, being patient is the key since it seems you cannot flash back older firmware on ATV, so one can just hope they re introduce Atmos over True HD in the future.
If your AVR support Dolby Mat, then by using Integral2 or Vertex, you can get the ATV latest fw to work with your AVR for Atmos over Dolby MAT.
In such case, please consider trade in Linker for Integral2 or Vertex.