I have the exact same problem. I have an Onkyo TX-RZ830 that got an eARC update. I bought a 2019 Q70R thinking it was going to do the same eventually. I got it because it was touting Freesync and I have an AMD RX5700. Well guess what? You can't do Freesync and have uncompressed 5.1 signal with Atmos or even 5.1 compressed Dolby Digital +. So either you can have a stereo signal in Windows with Freesync or connect directly to your receiver and get Dolby True HD with Atmos and no Freesync. I have a 5.1.4 setup and games sound amazing. I've connected HDMI directly to the Q70R to see Freesync at 120Hz and it looks amazing. You should be able to do both. Now I see the new 2020 QLED's have eARC. I don't have an extra $1,200 to get a new TV. I just replaced my 15 year old receiver, got this TV, and bought 4 extra speakers for Atmos.
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