Level1Tech KVM is restarting/filkering displays

Level1 Store KVM Helpdesk
1

Hi All,

I just bought a 4 pc, 2 monitor 1.4dp kvm.

My current configuration,

Monitor1 - Asus ROG Swift PG27U
Monitor2 - BenQ ZOWIE 24" XL2411

Keyboard - Wooting 60 HE (I was not able to get enough power on the HUD ports for keyboard so I had to use the front USB [blue color] port to power the keyboard)
Mouse - Glorious model O wireless

Pc1 windows with 3090 connecting both the dp to the kvm + keyboard and mouse

PC2 MAC - only keyboard and mouse

PC3 Linux server - only one dp connected form the AMD iGPU + keyborad and mouse

Issue:

When I switch to the PC1 the Monitor 1 keeps restarting/flickering (goes black) every few seconds but the Monitor 2 is kind of stable, the restarting/flickering happens very rarely

If I turn of the monitor 1, monitor 2 flickers a lot for immediately, but stables from some time and the flickering happens very rarely

During this whole flickering the mouse and keyboard never disconnects.

I’m using club3d cables for monitor connection and amazon cables for keyboard and mouse.

Any help on this is appreciated :slight_smile:

2

you’ll probably have to swap to fibbr brand fiber optic cables for displayport. get the 6.56f or longer ones. On the packaging for the club3d cables can you take a pic of the qr code? is it weirdly blurry/not crisp as compared with the rest of the label?

this suggests RF type interference. could get some $10 ferrite clamps from amazon if you want to try those before the expensive fibbr fiber optic cables. what have you got on the mac side adapting that cable?

3

PXL_20230304_083531196
PXL_20230304_0835311961920Ă—2560 202 KB

This is the image, the QR code is clear and I can scan it, it take me to the club3d product page

Where/how do I need to use the “ferrite clamps”?

do I need to replace all the dp cables with the fiber optic one or just the one from my pc to dock ?

5

@wendell I went a head and purchased this " FIBBR Fiber Optic Displayport Cable, High Speed Optical DP to DP Cable, Support 32.4 Gbps 8k@60hz 4K@144Hz (6.6ft)" from amazon and plugged it to all 3 ports to my main monitor1 & monitor 2 and pc1 to the KVM it still flickers :sob:

6

Hmm, might be the kvm, you may need to mail it in so i can test more. Fibbr is the good stuff. Can you try disabling adaptive sync for diagnostic purposes and see if that cures it with the fibbr cables??

The thing to think of tho is with the kvm the cables on both sides of the kvm are treated as one big long cable. So each cable can worn individually but when you’ve got the kvm you’re really running two cables at a time. The kvm doesn’t repeat signal. So if cable1 takes away some signal then cable 2 takes away a little more you can be below.

Fibbr takes away almost zero. The kvm takes away close to zero too (usually)

7

Thanks! @wendell I have disable the G-sync and Vertical Sync and it seems to be stable for now, I’ll check it for few days to make sure :slight_smile:

8

@wendell I issue is still persistent, my guess is there is some issue with the KVM :frowning:

9

yeah, seems like… email me wendell @ level1techs.com and you can mail it in and I will test and fix you up :smiley:

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