09-12-2017
@Corona688.......I reckon your post#8 is exactly on track. This Ubuntu installation thinks it's on a laptop. The OP says that the screen doesn't go completely black. The OS is trying to change the backlight. Yes, that's a ACPI fix. We also know well that Ubuntu open source display drivers have particular problems with Intel graphics.
Search the web for 'Ubuntu', 'backlight', 'Intel graphics', etc.
This looks weird until you consider a laptop installation then it suddenly becomes very common.
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LEARN ABOUT OPENSOLARIS
xbacklight
XBACKLIGHT(1) General Commands Manual XBACKLIGHT(1)
NAME
xbacklight - adjust backlight brightness using RandR extension
SYNOPSIS
xbacklight [-help] [-display display] [-get] [-set percent] [-inc percent] [-dec percent]
DESCRIPTION
Xbacklight is used to adjust the backlight brightness where supported. It finds all outputs on the X server supporting backlight brightness
control and changes them all in the same way.
-get Print out the current backlight brightness of each output with such a control. The brightness is represented as a percentage of the
maximum brightness supported.
-set percent
Sets each backlight brightness to the specified level.
-inc percent
Increases brightness by the specified amount.
-dec percent
Decreases brightness by the specified amount.
-help Print out a summary of the usage and exit.
-time milliseconds
Length of time to spend fading the backlight between old and new value. Default is 200.
-steps number
Number of steps to take while fading. Default is 20.
SEE ALSO
Xrandr(3)
AUTHORS
Keith Packard, Open Source Technology Center, Intel Corporation.
X Version 11 xbacklight 1.1.2 XBACKLIGHT(1)