Can't Select 4k resolution over hdmi connection

[malvazar]

So I'm not good with Windows. I primarily use Linux as my daily driver, but I hop onto Windows 7 for play a select few games from time to time. So that being said please bare with me as I try to relearn all this Microsoft crap.

My problem is I have an LG 55" 4k television (55UH6030) connected to my computer, along with a 25" NEC monitor (2490WUXi). The NEC is capable of displaying in a 1920 x 1200 resolution, and obviously the LG is capable of 3840 x 2160. I've not had any problem with the NEC it's connect via DVI, its the LG that I'm have a problem with. It's connected via HDMI, but I can not for the life of me get windows 7 to allow me to set it to it's full resolution.

I know my system is capable of doing it.
Motherboard: Msi 970 gaming
CPU: AMD FX 8350
Ram: 16gig Patriot Vipor
Graphics: MSI R9 380 2gig x2 in crossfire

I've got AMD diver software up to date, I just don't understand why I can't set to LG to 4k. Any insight into this problem would be appreciated greatly. I'm probably just over looking something stupid or obvious.

 

[Glenwing]

Make sure in the TV settings, HDMI ULTRA HD Deep Color is set to On.

 

[malvazar]

Indeed it is.

 

[rontonomo]

that gpu does not have a hdmi 2.0 port so it will never work at 4k 60Hz. with a proper 18 gig HDMI cable, all you might be able to do is 4k at 30Hz which IMO looks like stuttery crap...

 

[malvazar]

Honestly I don't mind if it runs at 30Hz, I'd just like to be able to get it to a 4K resolution.

 

[Glenwing]

that gpu does not have a hdmi 2.0 port so it will never work at 4k 60Hz. with a proper 18 gig HDMI cable, all you might be able to do is 4k at 30Hz which IMO looks like stuttery crap...

If it's only 4K 30 Hz then it wouldn't require a cable that can handle 18 Gbit/s, and High Speed cable should work fine.

 

[rontonomo]

you could try getting a display port to hdmi 2.0 adapter, that should allow you to have working 4k with a 18 gig hdmi cable.

 

[malvazar]

I know my existing cable will work fine, I've already had it pushing a 4k signal on Linux just fine. Windows 7 just simply won't even give me the option in the resolution screen.

 

[rontonomo]

have you tried turning off uhd deep color on the input that the pc is on?

 

[malvazar]

Just tried that. Did not work.

 

[Glenwing]

Try setting a custom resolution in the AMD Setting app.

 

[malvazar]

I haven't been able to figure out where in that app you do that. >.>

 

[malvazar]

Finally figured it out. Had to turn off GPU Scaling. I've now got in running if full 4k.