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the GCS632U has keyboard and mouse emulation that may not function correctly with docking stations. To ensure the KVM it self is working correctly I would suggest plugging the single USB from the KVM directly into the laptop and see if you have the same keyboard problem. This will at least tell you if the KVM is working properly or not.
Repeating keys? This is a common problem for KVM switches if you go beyond the devices' capability. As you can see, GCS62 is a PS/2 KVM switch and it was designed to work only using a regular PS/2 keyboard.
This KVM switch does not support PS/2 to USB adapter. It might work but it's not guaranteed to work correctly. This does not work properly if you have a docking station for the laptop. It might work for couple of months then it would stop.
You smay isolate the problem by following the steps below:
1. Connect the keyboard directly to the computer to see if you will get the same problem.
2. Power cycle the KVM switch by disconnecting it from the computers and leave it unplugged for a minute or two.
3. Avoid using hybrid connection (PS/2 converted to USB) only for testing purposes.
4. If that work, then you know the answer is that this KVM only designed an work correctly with native PS/2 connection.
The GCS634U is designed and tested to work only with a standard USB keyboard and mouse. However, most wireless keyboards and mice work with it, but they cannot guarantee any specific model or brand that would work correctly.
As you can see, this KVM switch is a bus powered device (meaning it only gets power from the USB ports of the computers). If the computer cannot provide enough power for the KVM switch to function correctly, then the wireless keyboard will be affected.
You may try using the IOGEAR GKM541RA. It's tested to work with the GCS634U. Or you may also try using a self-powered USB hub (meaning, it has it's own power adapter) and connect it in between the KVM switch and the computer. That self-powered USB hub will be the one that will add up power to the KVM switch and help it to function properly.
Solution for the mouse. I have 8 KVM's. Most of my computers work with the KVMs. On 1 inland KVM the logitect and Microsoft optical mice do not work on one computer (but work with the other computers). They both are USB. I hook them up with a USB to PS2 adapter. If I use a ps2 ball mouse connected to the KVM the mouse works. All the Mice work if I directly connect them. Since I do not want a ball mouse I got a Frisby optical PS2 mouse. It works with all the computers on the KVM's.
I do not have a solution for the Keyboard yet. 1 computer (ASUS MB) on my trendnet or belkin 4 postion KVM does not recognize the keyboard.
Plug the key board and mouse directly into the computer that doesn't work, let it recognize the hardware and then reboot. After reboot, plug the keyboard and mouse back into the KVM and reboot again. That solved the problem for me. Most likely, the computer that doesn't work has never loaded the driver for that key board and does not recognize the input sent from the KVM.