Brightness level jumps to full when using "Brightness & lock"

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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I'v added the targeted package.

more informations :
Samsung notebook - Model : NP300E5A
Memory : 3.8 GB
Processor: Intel core i3-2350M CPU 2.30GHz x4
$ lspci :
VGA compatible controller: intel corporation 2nd generation core processor family integrated graphic controller (rev 09).

Ubuntu 12.04 (precise) 32-bit

I have chakra-2012.02.08-Archimedes (KDE desktop) installed alongside ubuntu in this machine and the exact same problem is there, that makes me think that this issue is not related to gnome-control-center.

Another thing ,when ever i use "fn" key shortcut to reduce the light it jumps again to full light then reduces it like one level only and stucks on something like 80% percent, it refues to reduce more.

I found a workaround that solved the issue for me ,here is the link:
http://www.voria.org/forum/viewtopic.php?f=3&t=1066
But the bug is still there.

the bug is years old without activity nor new report and the code changed quite a lot since, closing, feel free to register new bugs if you have issues in newer versions though