Same issue here, solved by disabling "legacy keyboard support" in the BIOS. Award BIOS version 6.00PG, if it is of any use.
-- PS/2 keyboard broken by "legacy USB keyboard" option in BIOS https://launchpad.net/bugs/48877 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
