Hello! Hopefully I can answer some of your questions.
The first thing I noticed is your GPU.
I found this from Tom’s Hardware:
The 580 says it’s DP 1.4 “ready” so I’m assuming it should at least be compatible with a DP 1.4 KVM. However, I must add especially old AMD Linux drivers could be a little sketchy…
It could be that your VBIOS is old, and if the card is DP 1.4 ready, maybe they fleshed that out in more recent VBIOS.
i would check if there is an actual VBIOS update for your Radeon RX 580. (NOT graphics driver) The latest I could find from Sapphire is 2018:
Absolutely. Here at L1 we use Moshi:
This cable is expensive, however, I can assure you it is the best we’ve found. Surprisingly, a quality USB-C to DP (display & data) is hard to find!
You may also consider this product from us:
This product will take your DisplayPort connection and convert it to USB-C. This is if you would like to use our USB-C KVM instead of our DisplayPort 1.4 KVM. Probably not? But I wanted to throw it out there as an option.
We can confirm our DisplayPort 1.4 KVMs work at 5120 x 1440 up to 120Hz without DSC (display screen compression) and up to 240Hz with DSC. We tested this with a Samsung Odyssey G9 Neo:
IMPORTANT - You need good cables. It so, so important. There’s a detailed explanation in the FAQ/troubleshooting thread below, but I’ll give you a primer here. The L1T KVM, and probably other brands, see all the cables as 1 long cable. if you use long copper cabling, the signal will degrade. This causes many graphics and usability problems. Your resolution & hz could very well be limited because of bad cabling.
We use FIBBR fiberoptic cables to prevent this:
Check out the official FAQ/troubleshooting thread here for more info:
If you are very interested in purchasing a KVM now, you can email an inquiry to us at
I’m sure @wendell can also assess your situation and help you.
Our KVM should work for you. Get some good cables. Either Club3D or FIBBR & you will be fine.