HDR Advanced Colour problem

[andy06shake]

I recently purchased an LG 55UJ651V 55 Inch Smart 4K Ultra HD TV with HDR to use in conjunction with my GTX1070 but cannot seem to get the HDMI Ultra HD Deep Colour function to work.

When I set HDR and advanced colour setting to on via the PC display settings the TV reports invalid format even when I have turned on HDMI Ultra HD Deep Colour to the HDMI port via the TV options.

The TV supports chroma 4:4:4 format and I have an HDMI 2.0 cable that should be able to transmit 60Hz/60FPS.

I include my Dxdiag report.

Can anyone help, please?

 

[andy06shake]

Seem that its an HDMI handshake issue. Plugged in my old 3 meter HDMI cable which I purchased for around £5-10 a few years back and hew presto no invalid format issue when I enable HDR and advanced colour, and reporting 60hz/fps 10bit.

Thing is it's a little short for my liking, the new one being 5 meters, I wonder if the additional 2 meters is a concern? New cable cost £20 as well. LoL