My bad. I had thought DDP also used an AC-3 core like TrueHD.

Sadly, the overhaul did not solve the problem. I’m now looking at either the TV or the AVR receiver itself. The GPU is a higher HDMI spec than the receiver or the TV (2.1 for the GPU, 2.0a for the TV and 2.0 for the receiver), so it’s ...

But if your system can't passthrough E-AC3, DDP has a core AC-3 stream that should go through, same as with TrueHD.

I've decided that I'm not going to worry about it anymore. I'm going to do a mobo upgrade, and that will force me to reinstall Windows 10 Pro, which should give me back AC-3 ...

It does. It lists PCM, Dolby Digital Plus and DTS. Unfortunately, the problem persists. I’ve more or less given up on finding a solution. The system’s a couple months away from a major overhaul, and hopefully a full-scale clean install might help.

Unfortunately that means installing Win10 Pro first ...

I seem to be having a problem with AC-3 Passthrough on WIn11. It's telling me that AC-3 Digital Passthrough is not available. At first I had thought that it was because the latest 24H2 upgrade doesn't have the AC-3 codec or removes it, but I am unsure where to check to see if I have it installed ...