Forgot to mention:
1) I didn't have 'ACPI: Failed to switch the brightness' in dmesg - it just 
didn't work silently.
2) Acer TravelMate 5335 comes with 'Intel GMA 4500MHD'

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https://bugs.launchpad.net/bugs/568611

Title:
  Screen brightness control fails on Dell Studio 1558

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