"Gamers Keyboards" by adding a tunable, "hw.usb.ukbd.pollrate", which can fix the polling rate of the attached USB keyboards in the range 1..1000Hz. A similar feature already exists in the USB mouse driver. Use with care! Might leave you without keyboard input. This feature is only available when the USB_DEBUG option is set in the kernel configuration file. Correct "unit" type to "int" while at it.