Thanks James. My configuration is different: the laptops in question are
in mechanical docks. The laptop remains closed (lid down); external
display is connected to the dock via HDMI, external keyboard and mouse
are also connected to the dock via USB dongle in the dock. So I can't
start them and then plug in the monitor very well: the external display
has to be primary.

I've also had this spinning logo and the forced powerdown that it forced
result in ACPI errors on the subsequent boots and shutdowns. We're not
sure whether this bug corrupted the ACPI table, or whether turning off
the splash screen exposed a latent bug in the BIOS. This is on a T440s.

I have changed splash quiet to splash noquiet and that -- so far --
avoids this hang with the spinning logo; but then I get the laptop going
into suspend as soon as the login password is entered. I'm not sure
whether the two bugs are related in terms of cause or not.

At first, I tried to just restart the docked machine to resume out of
suspend; but over a period of days Ubuntu became unstable. So I tried to
reload Ubuntu, and encountered the bug where the installer now crashes
when the third-party driver option is selected. I need that for nvidia
and sierra wireless hardware. Result is that machine is now sidelined,
with numerous failed reinstallation attempts.

I'm using a backup machine (which does NOT have any nvidia). I have grub
changed to nosplash. But I'm still getting the suspend on login
problem... so I'm just hoping that the developers get these bugs fixed
before the second machine goes down. Again, bug numbers for the other 3
items are in post 45 above.

We've got a T480 also, but it uses an external display connected to the
dock via DVI AND the laptop is run open with its own internal display as
primary. I'm hoping that I won't see problems there. So far so good with
that configuration, knock on wood...

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https://bugs.launchpad.net/bugs/1872159

Title:
  Boot animation never finishes when external monitors (or just more
  than one) are connected

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