I bought a new laptop with following page describing the hardware details: http://support.hp.com/us-en/product/HP-15-r200-Notebook-PC-series/7486447/model/7748035/document/c04576750/
Installed NetBSD 6.1.5 amd64 on it. I find that, at initial stage of the boot i.e at the boot menu, an external USB keyboard is recognized i.e. I can hit Enter using external keyboard for boot to resume. However later during the boot the keyboard starts functioning. Detaching/attaching keyboard seems to produce no dmesg message. There are 3 USB ports and tried placing keyboard in each one of them. The behavior is no different. Keyboard seemed to work fine on the same laptop with Linux, Debian Wheezy. Mayuresh.
