Workaround confirmed, /etc/X11/xorg.conf reads as follows (entire file):
Section "Device"
Identifier "Default Device"
Option "NoLogo" "True"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
Log out and logged back in and brightness control works as expected.
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https://bugs.launchpad.net/bugs/939569
Title:
Brightness control on Toshiba Satellite C660 laptop
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