Question 4k Resolution turns to 1080p in Duplicate, please help.

May 10, 2019
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Hi guys,

I am having a hard time setting up my new 4k tv as a duplicate display with my 4k pc monitor.
I am running a triple set up, 4k monitor, 4k hdtv, 1080p monitor that is always in extended.

When 4k monitor + 4k hdtv is in extended mode they are both outputting 4k.
When I duplicate/mirror 4k monitor to 4k hdtv the 4k hdtv turns into a 1080p signal.
Please help.

I have a LG 27UD58 and a TCL R613. I tried 2 HDMI 2.0 cables and am using a DP 1.4 to HDMI 2.0 Dongle for the 4k hdtv.
My gpu is a P6000.

EDIT
When I disconnect my third device, the 1080p monitor the two 4k displays duplicate 4k 60 no problem!
I also dont understand why only the TV becomes 1080p 60hz, monitor is always 4k 60.
 
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