Custom Resolution Utility (CRU)

[chillly]

I was mainly trying to use CRU to enable 7.1 DD+ passthrough ARC from my Samsung Q70 TV. By default, the control panel->sound->Samsung->speaker setup only showed Stereo. But the device properties show it supports DD(5.1) and DD+(7.1), which both should work through ARC (and they do work from the native netflix app on the TV).

So I ran a HDMI cable from a second port on my GFX card to my receiver directly, and looked at that 'monitor' in CRU in the extension block Speaker Setup to see what was checked (that connection allows 7.1 speakers). Then I edited the Samsung in CRU to check those same speakers. Then rebooted.

But this doesn't seem to have had any effect. I also tried exporting those settings as an INF and doing the advanced boot with driver signing disabled, etc. Still didn't do anything... only shows Stereo as an option.

I also tried changing the order of supported formats to move PCM to the bottom and move DD+ to the top, since the TV is still only receiving PCM from the computer. But this also had no effect.

Is there anything obvious I'm doing wrong maybe? Thank you!