Have the DP to VGA adapter model? I’m game to Amazon it asap haha.
@wendell I have a weird bug as well. I have the 4 port/2 displays model and 2 computers hooked up to it.
Computer 1 has a 1080 Ti and Computer 2 had a RX 580. All was fine, I just swapped out the RX 580 for a 1070 and now only 1 monitor will work reliably. Randomly the second one will show up but it soon crashes the entire machine. If I plug it in directly everything is stable.
Computer 1 is stable regardless. I’ve swapped out cables going from the KVM to computer 2 with brand new ones. Any ideas?
What monitors? Updated the Nvidia dp firmware?
oh well, that makes me feel dumb. I didn’t know that existed. Updated the firmware and now it behaves just fine. While I have you here can I ask about another edge case?
I moved my RX 580 into a sonnet breakaway box to use with my MacBook Pro 2016, if I route the display through the kvm, they can’t make a good connection. If I route them through directly to the monitor they work just fine. Any ideas?
Cables or grounding can be the issue there. 19 pin not 20 pin dp cables are a must. Try to touch the metal outside of the laptop to the metal case of the thunderbolt enclosure.
I gotta make a list of known good USB c to dp options because they are few. Tb docks with a dp socket seem to work best.
I’m just plugging it into the RX 580 inside the enclosure. Tried a bunch of different thunderbolt ports and found a combo where one monitor works :).
So far so good, happy to help you debug if you want to go down this rabbit hole with me
Still testing
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@wendell oops, I’m trying to go the other way, take the DP out of the kvm console output to a monitor’s HDMI (or dvi or vga). This would get my second monitor going for my desktop and work laptop. For my t420 I would need a dvi to DP adapter like the ones you listed (USB power input) or in this case go with a known working adapter you linked taking vga to DP
If you want to connect an HDMI monitor to the console port on the kvm, an HDMI based kvm may be a better choice. Display port is the most functional display interface tech. It’s probably impossible to do dp out of the kvm to vga since it’s designed for 4k.
I could maybe see the case for a universal kvm that accepts everything from vga to dp inputs for dp output which is what these adapters would give you.
Do you not have a dp monitor to use with the output?
@wendell yeah unfortunately the second monitor only has HDMI, dvi and vga for input, my newbness I thought of display outputs more like UDP and not TCP.
The primary monitor is the LG 43" 4k, so it’s just me being greedy and trying to get even more realesate in, but I would have been fine with the single display lvl1 kvm with just the 43".
Are there any DP extenders/repeaters that have been tested and work with your KVM?
I’ve got one working (link here) between the KVM output and the monitor.
When trying the repeater on one of the KVM inputs with a Linux machine, it works initially, but the machine seems to lock up once you switch to another input. The monitor goes into power save mode and the keyboard is unresponsive (caps/num lock not working).
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So I’ve run into an issue with this KVM. I’ve been building a new machine; it’s a Linux development workstation, so I only got a Radeon RX 550 for a video card (the GV-RX550D5-2GD from Gigabyte). I have it hooked to port 3. 1 is my current Linux laptop, 2 is my Windows gaming laptop.
If I boot with the KVM on port 3, the console comes up, and everything is good. If I switch to another machine and then back, I get a blank screen and no signal. This happens if I’m in X on a Gentoo LiveCD, the console without X, or even in the BIOS/UEFI setup screen.
I’ve tried switching virtual terminals, logging in over SSH and restarting X remotely, etc. Nothing works except rebooting the machine.
Are there any known issues with Gigabyte Radeon cards? I have the dual monitor version, but am only using one of the two DisplayPorts (the lower one).
No but check kernel/log messages. Maybe you are getting dp link failures? What kernel bersion? Strongly recommend a recent kernel version because of changes to amdgpu. 550 is newer silicon iirc.
I have a test one from china but still trying to find one that does 21:9 and 32:9 resolutions.
What’s your setup you need a repeater?
I have 2 laptops and 2 servers that need connecting to the KVM. The servers are in a different room, requiring a 7m cable run for connectivity. The laptops were in the office.
I’ve since moved the KVM and laptops to where the servers are and used the extender on the DP output of the KVM - this works really well at 3840 x 2160 60HZ resolutions on my Dell UP3216Q.
The problems I was having was using a DP repeater on the KVM inputs.
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Huh, I didn’t think that could be it since I would lose signal if I switched off while I was on the BIOS or grub screen. I was using an older Gentoo LiveDVD since the newer ones can’t boot from UEFI.
I swithced to a newer Ubuntu Live CD and I can switch and and fourth fine (so long as the system is booted and not on the Grub screen). That should be good though. Thanks. 
@djsumdog and @wendell I seem to have the exact same problem but on a Windows7 box. Same Graphics card (Gigabyte rx550) and same behavior. If I boot the box while that output is selected in my KVM, then no problem. The second that I go over to another system and then try to go back to the system in question, no output, monitor goes to sleep. Any further ideas on this?
I had problems with this on my Fury. Does your display support MST? If so, disable it in the OSD. That mostly fixed it in my system. Additionally, you should make sure you’re running the latest drivers from AMD.