Fixed in the upstream 3.5. (Tried on 10.04 with vanilla kernel; installing 
3.5-quantal was a bad mistake...)
Upstream bug: https://bugzilla.kernel.org/show_bug.cgi?id=44451 
Still requires acpi_backlight=vendor

Also, the fn+left/right (brightness up/down on D270) still don't work.

Probably time to un-triage and get 3.5 kernel working with Ubuntu
10.04...


** Bug watch added: Linux Kernel Bug Tracker #44451
   http://bugzilla.kernel.org/show_bug.cgi?id=44451

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https://bugs.launchpad.net/bugs/974806

Title:
  /sys/class/backlight/ empty on Acer Aspire One D270

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