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I'm facing a problem whereby neither my keyboard nor my mouse work if they're both plugged into the USB ports on the back of my motherboard. The keyboard I'm using is a Razer BlackWidow and the mouse is a Razer DeathAdder. The motherboard in question is the Gigabyte H77N-WIFI.

However, both the keyboard and the mouse do work if I plug the mouse into the USB 3.0 port on the front of the case, which is connected to a USB header on the motherboard. I noticed that when I boot the PC with the keyboard and mouse plugged into the back motherboard ports I get this before the login screen:

Boot errors

Unfortunately I'm not linux savvy enough to know what that means and Google unfortunately returns mostly irrelevant results.

This used to happen on Ubuntu 13.10, however I mostly ignored it hoping that the upgrade to 14.04 will fix it but it hasn't. I'd really like to get back the use of a front USB port, so any help is greatly appreciated.

Update: After a little more investigation, this seems to only be an issue if I plug the keyboard and mouse into USB 2.0 ports. If I have one in a USB 2.0 and the other in a USB 3.0 (both on the back of the motherboard) this problem doesn't occur.

Regardless, I'd still like to not have to use up a USB 3.0 port for a mouse as I have other devices like external hard drives which would benefit greatly from USB 3.0, so I'm still looking for a solution.

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