Same problem. USB Keyboard HAMA SL640 on Ubuntu 12.04 64bit.
~$ lsusb
Bus 006 Device 003: ID 04d9:1503 Holtek Semiconductor, Inc. Shortboard Lefty

So the OS recognized it but the keyboard doesn't react ... even the Caps Lock 
and Num Lock keys don't blink.
Regarding the legacy support (useful for GRUB), I have found no entry in the 
BIOS.
In GRUB it works sometimes.
On the same laptop I have Win7 in dual boot. And I have to say that it always 
works on it.
Surprisingly now I have booted my laptop: the usb keyboard hasn't worked in 
GRUB but it has worked since the ubuntu login! And now I'm typing with it.
It means that Ubuntu has the right drivers and they work. But how to "load" 
them always correctly?

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https://bugs.launchpad.net/bugs/990870

Title:
  External USB keyboard not working in Ubuntu 12.04

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