I just recently got a new “1.4 Display Port KVM Switch - Dual Monitor - Four Computer” KVM. First attempt I naively used existing DP cables that I had laying around… despite being labeled DP 1.4, they were a mess. Tons of blanking and other issues, many intermittent. I then ordered a bunch of new 8K-rated, DP1.4 Club3D cables as recommended, and as short as possible (1-2 meters only). This worked much better.
So now I’m able to switch between my two primary machines. Both are modern Ryzen 5xxx systems with Radeon 6900 XTs in them. Both are running most of the same drivers. Win10 is identical between them.
Here’s the problem: Switching from machine #1 to #2 always works, semi-instantly. Going from #2 to #1 usually works fine if it’s been a while (at least a minute?). However, if I switch from #1 → #2, then #2 → #1 again within a few seconds (say if I want to quickly check something) then I am greeted with a black screen on both monitors for machine #1. This lasts for around 20-30 seconds, and then eventually the screens come back to life and everything is fine.
Going from #1 → #2 is never a problem. It’s only #2 → #1.
EDIT: it actually does happen going from #1 → #2 after all. Might be more tolerant of a quick switch in this situation (for unknown reasons), but it still happens.
Anyone know why this might be? Is it something going on with the KVM? Or a setting that is unique to #1 that I can possibly change?