I'm using a UD68. Tried an ancient hdmi cable and a "high speed" hdmi cable. They both worked fine except my monitor ran at 30Hz. I have a GTX 1080 card. Could be AMD driver related, I have no idea? Why not just get a pair of DP cables?

 

I see you said you got it to work at 30Hz. Did you ever get HDMI working at 60Hz?

Unfortunately can't use DP because of the dreaded windows multi-monitor resizing application reshuffling bug that's never been resolved.
http://superuser.com/questions/267086/how-to-stop-windows-resizing-when-the-monitor-display-channel-is-turned-off-sw
https://hardforum.com/threads/resolution-changes-when-monitor-shuts-off.1507324/
http://www.overclock.net/t/1592135/obnoxious-displayport-windows-resizing-nightmare-windows-10-4k-dell-p2715q-nvidia-gtx-970/0_100

So if I use DP my windows get resized/moved to my primary monitor after monitors wake up from sleep, and if I use HDMI I get random signal loss. Basically either way I'm screwed.

 

Quote:

Originally Posted by fleshconsumed

I see you said you got it to work at 30Hz. Did you ever get HDMI working at 60Hz?

Unfortunately can't use DP because of the dreaded windows multi-monitor resizing application reshuffling bug that's never been resolved.
http://superuser.com/questions/267086/how-to-stop-windows-resizing-when-the-monitor-display-channel-is-turned-off-sw
https://hardforum.com/threads/resolution-changes-when-monitor-shuts-off.1507324/
http://www.overclock.net/t/1592135/obnoxious-displayport-windows-resizing-nightmare-windows-10-4k-dell-p2715q-nvidia-gtx-970/0_100

So if I use DP my windows get resized/moved to my primary monitor after monitors wake up from sleep, and if I use HDMI I get random signal loss. Basically either way I'm screwed.

Ah I see, that stinks. No I have not tried hdmi at all since I last posted, I just use a single monitor w/ DP cable and no other screens connected so I don't have the issues mentioned in those threads.

 

Any HDMI 2.0 cable should work, just go to Picture > Custom > HDMI UHD Color > On to enable 60hz 4K

 

Quote:

Originally Posted by rocketraid

Any HDMI 2.0 cable should work, just go to Picture > Custom > HDMI UHD Color > On to enable 60hz 4K

Yes, I have already enabled "HDMI ULTRA HD Deep Color" in the monitor settings to enable 60Hz. That's not the problem. The monitor works at 60 Hz, it's just that I get signal loss for a few seconds every once in a while.

Interesting to note is that the only thing that seems to fix intermittent signal loss is going into advanced windows display adapter property and changing refresh rate on both monitors, 60 to 59 or 59 to 60hz works.

P.S. ordered the fanciest set of bluejeanscables I could find, $20 a pop, it hurt to buy those and it hurts to write it, but if they won't work, I don't know what will.

 

That happens to me on various TVs and cables, it happened on the last few Samsung 4K TVs I had and my current LG OLED TV.

I think its related to the mini fridge I have, once the fridge compressor kicks in or out sometimes I get these blank screens.

 

Updating the thread in case someone facing the same problem comes across it.

I never solved my problem with HDMI outputs directly. I think there is a wide spread incompatibility between RX480 and certain 4K displays as evidenced by the thread at https://community.amd.com/thread/205187 where multiple people describe the same problem and I just happened to be one of the "lucky" ones.

In the end the only way to solve my problem was to order two passive DP to HDMI cables. Sadly freesync doesn't work, but at least I don't have to deal with windows rearranging all of my applications onto a single screen when my monitors go to sleep if I use pure DP, and I don't have to deal with my monitors spazzing out if I use pure HDMI.

 

Quote:

Originally Posted by fleshconsumed

Updating the thread in case someone facing the same problem comes across it.

I never solved my problem with HDMI outputs directly. I think there is a wide spread incompatibility between RX480 and certain 4K displays as evidenced by the thread at https://community.amd.com/thread/205187 where multiple people describe the same problem and I just happened to be one of the "lucky" ones.

In the end the only way to solve my problem was to order two passive DP to HDMI cables. Sadly freesync doesn't work, but at least I don't have to deal with windows rearranging all of my applications onto a single screen when my monitors go to sleep if I use pure DP, and I don't have to deal with my monitors spazzing out if I use pure HDMI.

I know it gets confusing when it comes to cables now. Have you tried a Display port to HDMI yet? Curious if that might do better. I got my first 144hz monitor and thought HDMI would work yet it took a DVI-D cable to get me the 144hz. All the other cables left me with 60hz.

 

Quote:

Originally Posted by BinaryBummer

I know it gets confusing when it comes to cables now. Have you tried a Display port to HDMI yet? Curious if that might do better. I got my first 144hz monitor and thought HDMI would work yet it took a DVI-D cable to get me the 144hz. All the other cables left me with 60hz.

Uhm... if you read my last paragraph, that is exactly what I did. I got a pair of DP to HDMI cables.