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120Hz through a HW-N950?

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So I've got the Samsung NU8000 55" TV which has a panel capable of 120Hz at 2560x1440.  This worked amazingly when I had a direct HDMI lead from my PC to the TV.

Then I got the HW-N950 soundbar and obviously I have to use that as a pass-through.  So I now have HDMI from the PC to the bar, then from the bar to the TV.

Now that I have the PC going into the HW-N950, I can't select 120Hz at 2560x1440 in my resolution settings which is a massive problem as it was the main reason I went with this TV.  I can run 120Hz at 1920x1080 but anything above that is capped at 60Hz.

Does this sound familiar to anyone? I've enabled and disabled both HDR and Game Mode on the TV to try and kick it into life but it just won't have it.  Does anyone have any ideas? Much appreciated!

 

Edit - so after playing with this, it's clear there's a reporting issue with the TV feeding back to the PC through the bar.

If I select 2560x1440 in the Nvidia control panel, the TV reports the resolution as 3840x2160 on screen.  If I select 800x600, the TV reports 1920x1080 @120Hz on screen.  This is most frustrating, it's like the TV isn't able to talk back to the PC through the bar.  Can anyone clarify as this is a total deal breaker for me.

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