okay .. thought about this for a bit i915 compiled as module by default
in kernel sources.. lets force it to load..

added module i915 to /etc/modules to force loading .. it is the only
entry ..

reboot into the problem install .. and  no problems .. lightdm starts and stays 
going.
 no flicker or flash off, delay, and on again at all either .. 

** Attachment added: "Xorg.0.log--zl10 --module-i915 -forced to load"
   
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1821609/+attachment/5252326/+files/Xorg.0.log

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https://bugs.launchpad.net/bugs/1821609

Title:
  lightdm login screen briefly appears and then blanks out on Intel(R)
  Core(TM)2 Duo CPU T5870

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