Keyboard & Mouse input lag issue

for several years, I have suffred from weird problem.

after very first time boot up(cold booting), keyboard & mouse input was very very slow. it's looks like watching a buffering video. but, other application executions are no problem. and one more strange thing is that rebooting(warm booting) was solved this problem.

so, to solve this problem, I was tried many means. changing the BIOS, re-installing the OS(Windows & Linux) and so on. but, nothing changed.

then, I suspected the keyboard & mouse own problem. but it was also not correct. because other well functioning input devices show same malfunction on my PC.

finally, I tried other way. it was the changing the USB ports. I have used USB 2.0 ports for input devices. because ordinary PC recognize input devices on BIOS only when it connected to USB 2.0 ports. but, after changing from the USB 2.0 ports to the USB 3.0 ports, the problem that sufferd me for several years was gone!

I think this problem is very weird. keyboard & mouse is not require broad data bandwidth and more power consumption. but the USB 2.0 ports was not works properly on input devices.

anyway, if you have same problem, change the input devices connection from the USB 2.0 ports to the USB 3.0 ports.

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I would like to update.

several month after suffering, finally I figure out what was the problem.
USB has special option that called 'Hand-off'.
maybe many of you will ask me, so what is that special option?
That's the compatibility mode for USB.
explain more kindly, USB can operate low-speed mode that was defined past time. that was the point.

generally USB 2.0 can support USB 2.0 full-speed and USB 1.0. but, because USB is not recognized proper speed perfectly automatic, sometimes misunderstand speed. therefore we have to define the speed explicity.

so, we have to prevent that USB itself change high-speed to low-speed.

If you have same problem, disable the USB 2.0 'Hand-off' option on Mainboard BIOS.
now, I have good feeling like get new USB hub.

good luck!


P.S. my mainboard model is Gigabyte H77-D3H-MVP (Rev 1.1)