[Bug 994558] [NEW] brightness problem acer aspire 5745-dg

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Hello guys.I am new in ubuntu and i bought a brand new laptop acer
aspire 5745-dg with windows but i put and ubuntu together.My problem is
that the brightness changes from windows but i cannot change it inside
ubuntu,for example the fn keys don't work and i cant change the
brightness from power management too.The funny part is that the fn keys
for the sound work great!My problem is that the brightness is always at
maximun as a result to reduce my battery life!!I have reported this
problem to many sites but noone could help me..:/I have already tried to
change some lines in grub but nothing changed.I also have heared that
this might be a bios problem...Can you please help me with this serious
problem???I would appriciate that!!!

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.10.0-0ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Fri May  4 15:39:12 2012
DistroCodename: precise
DistroVariant: ubuntu
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=el_GR.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: acpi-support (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise ubuntu
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brightness problem acer aspire 5745-dg 
https://bugs.launchpad.net/bugs/994558
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