I don't believe for a second that he didn't know what he was doing or didn't see the linesman. He was looking right at him and raised his arms to hit him. It's probably something he woudn't have done if he hadn't been knocked loopy, but he did it with intent anyway.
I agree, still think he should get 10-15 games. I want the NHL to finally set an example on you can't touch the refs like that. Unacceptable.