I ended up replacing the Targus ACP70 (over two years of service without issue) with a new Dell D3100. I ran into a completely different set of issues. Everything appeared to work, except my main display. My main monitor (Dell U2412M) would constantly flicker. As best I could tell, the displayport was trying to resize the screen every few seconds, so the resolution would bounce and reset the mouse position, making the entire system totally unusable. Swapping cables made no difference. No issues on a spare AOC 20" monitor I had sitting around. On a lark, I downgraded to the previous firmware and all is well now.
TLDR: Release M4 is severely flawed on my setup.
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