Quality Update breaks internal display of lenovo laptops.

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A recent Quality update in windows 10 has been "breaking"
the internal display in laptops.   It seems to mainly effect
Lenovo laptops, although in the past a similar issue has
also impacted dell laptops after upgrading to windows 10.  
Annoyingly I did not note the number of the update in
question, but it was installed last week on the machines I
found with the issue.

It can usually be diagnosed by connecting an external
display then powering the machine on.  Initially you wont
see anything, but on reaching the sign in page it will
appear on the external display.

Removing or system restoring seems to bring the internal
display back to life - although it will attempt to install
the update again unless you explicitly block it with the
hide update tool.

This issue is particularly diabolical, as it somehow also
prevents the startup logo from being shown as well when you
turn the machine on.  It seems to interfere with the (uefi?)
bootloader somehow too. How this is even possible I have no
idea, but it seems pretty deliberate.

Frustratingly, the internal display may begin working again
randomly, usually after reaching the sign in page - which
makes troubleshooting a pain.  This seems to related to the
internal display device ID changing.

The symptoms manifest as a failed LCD module, and when you
change the lcd module the new screen hardware ID will mean
the display works again initially - until you reboot next
that is.  Then the new display will behave like it has
failed too, even with nothing wrong with it.

It also doesn't seem to be specific to a particular model
Lenovo; i've seen three instances this week alone.  If the
external display is configured to never display output, the
Laptop is essentially unusable; and will /appear/ to be
dead, except window has actually loaded in the background;
and you may even hear a sound when plugging in devices. The
only option is to buy another one at that point, so not even
the recovery options screen will work after the update.

Seems awfully interesting that they are all lenovos however..

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