Keyboard and Mouse not recognized when connected from a KVM switch

Both keyboard and mouse connected via KVM switchs are not being recognized by some of the recent Lambda machines.
Two instances:

  1. 4 port KVM switch with HDMI + USB connections. It happened when I connected 3 Quads and 1 Vector via a 4 port KVM switch. The Vector machine doesn’t respond to when I switch to this Vector machine. Other 3 Quads switch properly and I can see the display and responds to Keyboard and Mouse inputs.

  2. 4 port KVM switch with VGA + USB connections… I also have similar issue with Lambda blade servers all hooked to KVM via VGA and USB interfaces. Here old blades work fine but nor the new 4 A6000 blade.

In both cases I have to use a separate wireless USB dongle to connect to the latest machines (Vector and the Latest Blade server).

Has any one faced this issue? And any suggestion?