I have Ubuntu 10.04 x64 server OS and program that uses Bidirectional LPT mode (some special application that directly uses I/O). It works OK with older board. I upgraded the server to new D525MW board and I cant switch to Bidirectional mode of LPT. Bit 5 of the Control Port (base address + 2) can't be set to 1. In BIOS I selected bidirectional mode for LPT.