Wake from sleep when docked to Mini Dock using USB mouse or keyboard attached to dock

I'd like to know how to wake a T520 connected to Mini Dock (type 4338). I have a basic USB mouse (wired) connected directly to the dock. I've verified all of the items in Device Manager (mice and USB ports) are enabled for "waking the computer".
In the article below, Lenovo says it's not possible to wake it by connecting directly to the dock....they say it's "not a limitation of the dock"... but "by design". Of, course that's the line all companies say now a days. But it CLEARLY IS A LIMITATION. They say the only way is using the power button on the dock. What a waste.
Lenovo article:
http://support.lenovo.com/en_US/diagnose-and-fix/detail.page?DocID=HT077684

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