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[Luiz Fernando <631412@xxxxxxxxxxxxxxxxxx>]

This is not on kubuntu only - I have exactly the same problem on Ubuntu.
My laptop is not the same as the reporter's (it's a Samsung R430), but
it has the same graphics chipset, has the same backlight setting
problem, I've used the same workaround on Lucid, and now it also doesn't
work on Maverick. I my case, taking off only "nomodeset" from the kernel
options allows the system to boot into X, and though the brightness does
change accordingly when the system is running on AC or battery (whereas
without "acpi_backlight=vendor" not even that happens), the brightness
can no longer me set on the Power Management on Gnome Preferences (the
slider is missing).

-- 
[maverick] - Xorg fails to load with "nomodeset" kernel parameter
https://bugs.launchpad.net/bugs/631412
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