Status update:
1. I haven't succeeded in making the old driver (1.3.54) work.
2. After reinstalling the new driver (1.4.210), I got zero monitors.
I made it working after lots of trial-and-error. The culprit is to boot the machine with dock disconnected, then log in (i.e. start X session for your user), when plug in the dock. This way, both monitors work.
It still works with either zero or 1 monitor if I forget to unplug the dock when I'm booting the laptop. But at least I know a workaround.
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