where is the respond????

Turn on HDMI UHD Deep Colour. This fixed it for me.

Hi Alvicano,

sorry fo the late reaction. We have seen many issues with the last 3 Driver Updates from AMD.
16.9.1 / 16.9.2 and 16.10.1 do all have updates aimed at RX400 series, but seem to cause issue for other cards/setups. Setups that worked just fine at 4K 60Hz but after driver update did not get higher than 30Hz anymore. We escalated this issue to R&D and AMD and working on a solution. Meanwhile, please uninstall the 16.10.1 driver completely and instead install driver version 16.8.3. That should also fix it for now.
http://support.amd.com/en-us/download/desktop/previous?os=Windows%2010%20-%2064

Will keep you posted on progress.

@MrFancypants04
@MST1407

Nooooo i have fix it now by changing the HDMI Port to  HDMI1 on my LG TV. before was on HDMI3 but how sorry that it limit the color depth only 8bpc (16.7 million colors) while HDMI3 can handle 12bpc (68.7 billion colors).
so now i can get 4k@60hz but with 8bpc limit. how sad
or with 4k@30hz with 12bpc.
so now i have the fix either the adapter doesn’t support 4k@60hz with 12bpc or the HDMI cable doesn’t support 4k@60hz with 12bpc.

My monitor support  4:4:4  4:2:0  4:2:2 4k@60hz so why is only limited to 8bpc? and i cant change it to 12bpc? either i have to change it to HDMI3 port in this case i can change it till 12bpc but with 30hz limit or return back to HDMI1 port to support 4k@60hz but with color depth limit till 8bpc.

I have a LG 49UB8500 and have it plugged into HDMI 3. When I turned on HDMI UHD Deep Colour in the TV settings, the TV turn off and on again and 4K60Hz is available again.

I have LG 4k 49UF770V only HDMI1 port support 4k@60hz but with color depth limit till 8bpc.
while HDMI3 port support till12 bpc but with 30hz limit even with Deep Colour on or off. maybe my monitor doesnt support  4k@60hz with color depth 12bpc.