There is no audio when an AppleTV 4K device is playing a DolbyAtmos movie in LPCM format using the HDMI IP pass-through example design.
When Dolby Atmos set to "OFF" (ie when sending 8 channels LPCM instead of Atmos), audio is either not played or is corrupted.
What is the cause of this issue?
This is a known issue in the HDMI 1.4/2.0 RX Subsystem driver version 5.3 in the 2019.1 release.
It only happens if the "clone EDID" functionality is used from the HDMI Pass-through Example Design.