My first post on the forum! Have been reading and trying many of the suggestions re the 4k 60hz issue with Intel 4600. Thanks to all who provided so much feedback!!
Before I described my setup, I confirm that I had 4K 3840×2160 60HZ working on a Skylake I7 6500U Intel HD 520 so I know the CAC-1070, HDMI cable and TV settings are all good.
Unfortunately the I7 6500U was a bit too weak and I had to switch to an I7-4790 3.6 with Intel HD 4600.
So setup as follows
CAC-1070 DP to HDMI 2.0, firmware 0X07 0X26
18gps HDMI 2.0 cable
LG 49UH668V with HDR enabled on HDMI connected to PC
Dell OptiPlex 9020, 4th Gen I7-4790 with Intel Graphics 4600
Graphics Drivers: 220.127.116.1101 from Intel, not the ones from Dell, I followed instructions from liamfoneill on how to manually install those.
So I tried the custom resolution solution and although I can set 3840×2160 60hz custom res, if I try to select it in General Settings, the screen goes black and then returns to 30hz.
I also tried connecting a second monitor as advised in another post with the same results.
Sorry for the long post, just want to be sure I give as much info as possible.
Hoping there’s a solution for the issue.
Thanks for the help in advance!!!!