I just tried with the Oneiric final CD (kernel 3.0.0-12-generic), and had the 
exact same problems, i.e.:
 * with the default boot options the laptop brightness keys made the brightness 
indicator window show, but the brightness wasn't actually changed, and
 * with acpi_osi=Linux in the isolinux command line, the brightness keys were 
indeed modifying the brightness, but the indicator window didn't appear.

** Changed in: linux (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/853244

Title:
  Acer Aspire 5742Z brightness keys not working

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