My Dell 1555's working great on Ubuntu 9.10. No problem with sound whatsoever ( i haven't done any tweaks to even enable it, as I remember ) but haven't tried multi-display thing yet. I might give it a shot soon.
I don't have any issues with graphic drivers or wifi either. So it's working pretty out-of-the-box.
Gimme a message if you want me to check something certain.
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