Comment 11 for bug 320874

For what it's worth, the backlight seems to work as expected in Kubuntu Karmic. Unfortunately, I don't have an Ubuntu/Karmic installation to try out at the moment.

When it comes to Jaunty, I've completely given up on the intel stack and am currently running what's available from the xorg-edgers PPA (including kernel)...

I'm happy to have this changed to "Fix Released" as it works fine under KDE. If you want me to try it out with gnome-power-manager as well, however, let me know here, and I'll do an apt-get install ubuntu-desktop.