YAY THIS IS IT!!!! 7735Z ON 9.10
applications-accessories-terminal then run
sudo gedit /etc/default/grub
change bottom line to this 
GRUB_CMDLINE_LINUX="nomodeset acpi_backlight=vendor"
save and sudo update-grub then reboot YAAAYY!!!
Thanks MAREK!

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LCD Brightness won't Change - intel 4 series
https://bugs.launchpad.net/bugs/392948
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