RE: CAC-1170 + Macbook 15

Home Forums CAC-1170 + Macbook 15 RE: CAC-1170 + Macbook 15


I’ve just sent an email now even though I think it would be more useful for everybody we could figure it out in this forum. I’m sure more people will benefit from this.

This is my email:


I’m trying to get 4k@60hz on my LG UF770V, I’m using a CAC-1170 adaptor (mini dp 1.2 to hdmi 2.0), hdmi cable 18gbps 2.0 (have tried 4 of them), the last hdmi cable actually allows me select 4k@60hz without the need of adding a custom resolution in switchresx.

On the back of my tv it’s written 4k@60hz, in the menu I enabled and disabled Lg Ultra Hd Deep Color, port 1 supports 4k@60hz (4:4:4, 4:2:2, 4:2:0).

When I select 3840 x 2160, 60 Hz (NTSC) HiDPI or the one without HiDPI the TV works ok, but shows 30hz, even in tv menu it shows 4k@30hz.

In I get 60hz, in About This Mac / System Report… / Graphics/Displays / it shows the resolution : 3840 x 2160 @ 60 Hz.

I have also updated the firmware for this adaptor with ps176b0_0x07.0x00.0x23_encryt_bank12.hex (you have no idea how hard it was to find a computer with a dedicated gpu, windows, mini dp port).

I have tried it on 3 macbooks (Late 2013 rMBP 15”, Mid 2014 rMBP 13”, Mid 2015 rMBP 15″), two tv’s (LG UF770V (my tv), LG UF850V (friend’s tv)).

The third cable which I have bought is :

This is the last hdmi cable which I have bought

<p class=”p1″>Basically I can choose 4k@60hz but in fact the tv displays 4k@30hz, even though the laptop informs me that the tv displays 4k@60hz.

What else can I do ?


Daniel Asofiei.