Same thing here. Stadia only seems to support Linear PCM 5.1, which works on my receiver when directly plugged into one of its HDMI ports (and a factory reset of the chromecast), but not when plugged...
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Same thing here. Stadia only seems to support Linear PCM 5.1, which works on my receiver when directly plugged into one of its HDMI ports (and a factory reset of the chromecast), but not when plugged into the TV using ARC. My receiver doesn't support 4K/60 passthrough nor HDR, so I'm stuck having to choose between 4K+HDR or 5.1 surround until Stadia supports sending our DD+ 5.1 which is supported through ARC. Given that the audio also has a serious sync issue, I'll stick with 4K+HDR and headphones for now.