This is still true with the Radeon driver in Natty.  There's no
BACKLIGHT property exposed on the LVDS interface.

Gnome Power Manager itself now works around it, with gnome-backlight-helper.
KDE also now somehow works around it, as well.

So, the user-facing portion is fixed, but the original problem (missing
BACKLIGHT property) still exists.

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https://bugs.launchpad.net/bugs/534677

Title:
  [lucid] Broken backlight control with Radeon open-source drivers

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https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/534677/+subscriptions

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