Public bug reported:

OS: Ubuntu 9.04
Laptop: Dell Studio 1555

After several minutes after boot I am not able to change display brightness  
and in kern.log added error:
Jun 27 08:28:05 ja-laptop kernel: [   62.100119] ACPI: EC: input buffer is not 
empty, aborting transaction

** Affects: ubuntu
     Importance: Undecided
         Status: New

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No change display brightness
https://bugs.launchpad.net/bugs/392812
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