Sorry, BigZAJ, I cannot respond affirmatively to your question. But I did want to reply to let you know that there's at least one other dock owner confirming a similar experience. I have said elsewhere that the principal complaints I have with my Surface Book are actually either complaints about the dock or about Windows 10 in general (minor matters, but things I'd like to see fixed).
My dock experiences:
- Does not support my two 60 Hz DisplayPort 1.2 4K monitors simultaneously. Will only power one of them at a time. This remains true even if I force the monitors to 30 Hz or set them to DisplayPort 1.1 mode.
- Trying to enable both 4K monitors sends the dock and Book into a continuous panic state where the monitors awake and go back to sleep repeatedly (about 5 seconds on, 5 seconds off, repeat) as the Book+dock apparently can never figure out what to do.
- A few incidents of charging just stopping at some point even though the dock connector is still illuminated and the attached display and USB devices continue working. What I mean is that the Book starts running on its batteries (and adjusts the built-in display's brightness accordingly) even though the dock is still attached.
- Routine (but not uniform) need to disconnect and re-connect the dock connector when re-attaching the Clipboard to the Surface Book base (to which my dock connector is more or less permanently affixed). When I attach the Clipboard to the base, the dock is sometimes not "detected" and the USB devices and external display do not awaken. Disconnecting and reconnecting the dock connector (and waiting about 30 seconds) usually resolves this matter.
- Periodic video signal drops to the single external 4K monitor. This doesn't happen too frequently—in fact, of all of the problems, I'd say that I am most comfortable living with this defect indefinitely. But it's a bit of a signal that the dock is of suspect quality.
It's a shame, really, because for me the dock is the weak link. The Surface Book itself is quite a delight to use. I love Windows Hello, I love the detachable tablet, I love the level of performance the device offers in such a small package.
The Windows 10 gripes I have are mostly about how it handles external displays, especially when displays are variable at run-time (connecting and disconnecting from docked displays, notably). But these strike me as resolvable software problems.
The Surface dock, though, I'm not sure if software alone can fix this.