troubleshooting Question

Wierd keyboard behaviour - Sometimes only windows key works

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nebb-tgr asked on
HardwareMicrosoft Legacy OS
7 Comments3 Solutions772 ViewsLast Modified:

We have a quite wierd problem on one of our projects. We have three PC's all connected with 1m cable to a KVM-switch with USB. The KVM switch is connected through a 10 meter amplified cable to a USB-hub. The USB-hub is in turn connected to a mouse and a wireless keyboard.

We are experiencing two separate problems, but both seem to be related to the communication between the USB-units and the PC.

Before I explain the problems, I need to point out that 95% of the time, everything works fine. The doesn't seem to be any kind of event that occurs before the problem appears, it just happens.

Problem 1 - Keyboard:
Writing normal text doesn't work anymore. But the windows key works.
Example: You can press the windows key to make the start-menu appear, but you can't write anything in the "Search programs and files" text box. I haven't checked all keys, there might be more working keys than the windows key.

Problem 2 - Mouse:
This seems to be a general problem that is always there. When you click a button, the mouseclick is not registered before you move the mouse. We use industrial rollerballs, so it is not natural to move the rollerball when you click.

I thought that all communication from mouse and keyboard was interrupt-driven. That should meen that a mouse-click would be transferred instantly. And I didn't think there would be any priority or anything on the kind of keys that are transferred. Why would the windows key work while the others dont?
Gajendra Rathod
Lead System Administrator

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