black screen after boot

[Bob]

I upgraded from 17.04 to 17.10 in a test partition on my laptop a Lenovo T60. 
When the upgrade was done I rebooted.  The system ran for a while with only a
black screen.  Since nothing was happening I entered my password, nothing
happened, I pressed some keys, nothing happened, at this point I assumed the
upgrade had failed so I pressed the power button.  Pressing the power button
caused the moon symbol on the laptop to light, this was a surprise so after the
disk activity light stopped blinking I pressed the power button again.  This
caused the login screen to display.  I did login and it appears that the system
functions properly.

Now any time I boot that system it comes up with a black screen and I have to
press the power to put the system to sleep and then press the power button
again to wake it up and display the login screen.

Since I have not seen any messages about anyone having the problem I assume I
am the only one with this problem.

Anyone have an idea on how to fix this?

-- 
Robert Blair


Suppose you were an idiot.  And suppose you were a member of Congress.  But then I repeat myself.  -- Mark Twain