*** This bug is a duplicate of bug 1813663 ***
    https://bugs.launchpad.net/bugs/1813663

Same Problem on Thinkpad L560 + Docking Station + External Monitor +
18.04 LTS amd64: When docked both screens go blank when Gnome Session
tries to start. Nothing works but REISUB.

>From the boot log:

Jan 30 12:24:47 remscheid kernel: BUG: unable to handle kernel NULL pointer 
dereference at 0000000000000245
Jan 30 12:24:47 remscheid kernel: IP: intel_ddi_post_disable+0x54/0x170 [i915]

Kernel was: 4.15.0-44-generic
Effect not reproducible with kernel: 4.15.0-43-generic

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https://bugs.launchpad.net/bugs/1813831

Title:
  Oops: NULL pointer dereference intel_ddi_post_disable+0x54/0x170

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