This bug disappeared after I switched to Intel only mode in Nvidia
x-server settings (was previously on Nvidia on-demand mode). My card is
GEForce 840M.
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I had faced this issue as mentioned in the askubuntu. Here is the bug
report I had generated using `ubuntu-bug sddm`. Let me know if there is
something else need to be done.
** Attachment added: "Bug report"
Public bug reported:
Backlight flashes at booting. And booting enters into black screen with
message "you need to manually fix graphics and video driver". Unable to
fix it manually.
If the lcd screen is turned off during booting using (fn+f7) keys ,
ubuntu 16.04 boots without any trouble.
