I've tried this on my own Lenovo Thinkpad X230 (also a 2306CTO), and I
can't reproduce the issue at all. I've tried both the dock's full-sized
DP connector and miniDP on the laptop itself (undocked), both work with
no issues at all, and no artifacts on the external screen (or the panel,
for that matter).
I have no idea what causes this. Perhaps we're dealing with a monitor
that claims to support some resolutions it doesn't really like? The
monitor I use is a fairly good Dell P2210, but doesn't apparently
confirm to EDID 1.3 (but still works correctly).
** Changed in: xorg (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1631519
Title:
No X on boot with external monitor connected
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