KVM Issue

Matt8445 · January 25, 2018

I am having an issue with a KVM.

I have a startech SV231DPDDUA2

https://www.startech.com/Server-Management/KVM-Switches/2-port-dual-dp-kvm-switch~SV231DPDDUA2

I have two machines.

1 - Custom built tower with a 1080TI

2 - Dell Precision laptop

I just wanted to be able to switch between these two.

I have two monitors

1 - Dell P2715Q a 4k monitor

2 - Dell U2417H a 1920x1080 monitor

So my issue is when I connect the tower PC directly to the 4k monitor all is well. I get 4k at 60hrz. I am happy with this. When I then connect the display out on the graphics card to the display in on the kvm for PC 1 and another cable to the input on the monitor I get black. However, it is black as if it was connected. I am using display port cables for this with no adapters. I then hooked up a second monitor bypassing the kvm. When I connect or disconnect the original monitor from the kvm the second one flashes implying that it sees the change. I think the black is a video black or something because generally, I get a little floating dialogue box saying no signal if it doesnt see a signal.

If I skip the display port cable and use the HDMI input on the monitor and run and hdmi cable to the kvm then put a female hdmi to male display port adapter on the kvm side it works. However it is maxing out at 30hrz. I would like this to work as it should using just display port connections without adapters and getting 4k on the main monitor at 60hrz. The secondary monitor seems to work fine.

Anyone have any advice on what to try or do? I contacted startech and they seem clueless.

Thanks,

Matt

djdellarobbia · January 26, 2018

It could be possible that the kvm may not be able to handle the resolution you are trying to use. The few KVM's I've used over the years have had similar issues to where the computer and monitor can max out to a fantastic resolution but through a kvm it doesn't hit that high. So I'd try just looking to see if there are kvm's out there that can handle the resolution you are trying to use.

I found a kvm that looks like it is capable of doing this at this link [4k KVM]

Hope this helps!

Matt8445 · January 26, 2018

Kind of funny. I actually have that one at my house. I have a work desktop, home desktop, and laptop. I have a little dock at home and work for the laptop that I have going into each kvm. At work, though I have two monitors set up and that is the issue.

After playing with it more I think I have semi sourced the issue. I think it was an HDCP/cable issue. I was getting video black and I think that that was caused by an hdcp issue. I am not sure however why that was being caused. I then swapped almost every cable and I have it working now, but with an occasional flicker. I am wondering if one of the cables maybe was not hdcp compliant if that is a thing?

djdellarobbia · January 27, 2018

15 hours ago, Matt8445 said:

Kind of funny. I actually have that one at my house. I have a work desktop, home desktop, and laptop. I have a little dock at home and work for the laptop that I have going into each kvm. At work, though I have two monitors set up and that is the issue.

After playing with it more I think I have semi sourced the issue. I think it was an HDCP/cable issue. I was getting video black and I think that that was caused by an hdcp issue. I am not sure however why that was being caused. I then swapped almost every cable and I have it working now, but with an occasional flicker. I am wondering if one of the cables maybe was not hdcp compliant if that is a thing?

It could very well be, I didn't consider that. I hope you can get it fully working! Best of luck!