Problem solved.
Tried adding acpi_backlight=vendor to boot parameter. Did not work
So I tried the recommendation for Intel HD Graphic Controllers.
Created the file /usr/share/X11/xorg.conf.d/80-backlight.conf with below
contents as recommended.
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that
works here
BusID "PCI:0:2:0"
EndSection
Problem Solved.
I am still running the upstream kernel at this time. Will reboot into
the final release kernel and report as to whether this works in that
kernel as well.
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https://bugs.launchpad.net/bugs/1307064
Title:
Ubuntu 14.04 Beta cannot adjust brightness on Lenovo Ideapad Z570
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