Dissapointed by the lack of progress on this bug, I decided to research and 
experiment more to a point where I am now happy with the way my boot up and 
shut down processes are working to my satisfaction, albeit not perfect.
You will notice I also raised the bug direct on xorg bug service 
https://bugs.freedesktop.org/show_bug.cgi?id=106407
and it was the response in there that made me appreciate it was not an xorg bug 
but that the problem lay elsewhere.

I decided to experiment with my grub file - some nagging thing suggested
it might go back several months this when I was having problems related
to not being able to disable accelerated graphics on shutdown.

During my problems I had assumed I was using an intel graphics driver -
my recollections and log outputs never suggested otherwise.  Indeed
examining  > System Settings > Details confimed it was "Graphics IntelĀ®
Ironlake Mobile".  Little minor things were though not right.  One
example - when clicking on the date in the system tray it did not
display all my upcoming calendar appts from my google calendar.

This is now an extract from /etc/default/grub file

#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force apm=power_off"
# the above line is the original from install - not satisfactory
# GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
# the above line is OK but the splash moving dots just keep going!
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
# the above line results in it booting into low graphics
GRUB_CMDLINE_LINUX_DEFAULT="quiet nomodeset"
# trying the above line to see if removing "splash" cures the moving dots
GRUB_CMDLINE_LINUX=""

You will see it was the addition of the nomodeset param that "solved"
the low graphics problem initially mentioned in this bug but it brought
with it other issues like the moving splash dots persisting in every
screen I opened. (I found the process' connected by ps -ef | grep
plymouth and then killed the last one off which got rid of the dots)

This then led me to removing the splash param in the grub file and now
although I get scrolls of info saying what is happening during boot and
no ubuntu splash, I can live with that.

Importantly, I should add the addition of the "nomodeset" param means >
System Settings > Details now shows "Graphics llvmpipe (LLVM 5.0, 128
bits)".  Clicking on date in the system tray displays my google calender
recent entries so all in all I am a happy bunny.

I will leave it to others to decide the status of this bug.  Hopefully,
my story may help others get to the bottom of their similar issues.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1764087

Title:
  Wrongly boots into low graphics mode

To manage notifications about this bug go to:
https://bugs.launchpad.net/xorg-server/+bug/1764087/+subscriptions

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