Additional testing:  Adding "acpi_osi=" (without quotes) with nothing
after the equal sign to the GRUB_CMDLINE_LINUX_DEFAULT line in
/etc/default/grub makes the brightness keys work complete with 10 levels
of brightness.  However, the notification no longer works.

Also, connecting and removing the AC adapter does not change the
brightness, even though power management is set to do so.  Curiously,
hitting brightness up key after unplugging the AC adapter drops the
brightness to 20%, suggesting the power management tried to set the
brightness value, but it didn't actually change the value.  The opposite
happens when plugging back into AC.

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https://bugs.launchpad.net/bugs/693942

Title:
  Acer Aspire 5742Z No Screen Brightness Control

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