I have 3 W520 laptops and 3 Thinkpad Mini Dock Plus Series 3 docks. The audio 1/8" audio out and microphone ports are not detected by Windows. In sound settings, the High Definition Audio Device is always disconnected. I read that there was an issue with background audio through the audio ports on an earlier run of these docks, but the production date on these are all 11/07 (after Lenovo fixed the problem). Has anyone had a similar problem? Are the ports inactive for the W520 by design?