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[Launchpad Bug Tracker <1370505@xxxxxxxxxxxxxxxxxx>]

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Hello, i had and have and will this problem on every laptop and with
every version of ubuntu and  its derivatives.

I installed lubuntu 14.04 on IBM lenovo laptop with intel graphic card
and my backlight could be changed with function keys but it goes either
to maximum or minimum.

it is similar to my bug previous bug report https://bugs.launchpad.net/ubuntu/+source/linux/+bug/990932
but this time i can change it before and after login but as i said either to max or min ...

i tried couple of things to solve the problem via trial and error:
- edited grub conf file and changed "acpi_backlight=legacy" line to ""acpi_backlight=vendor"  
-  i created a file /usr/share/X11/xorg.conf.d/20-intel.conf   here and edited it like this:

Section "Device"
    Identifier  "card0"
    Driver      "intel"
    Option      "Backlight" #  "intel_backlight"
    BusID       "PCI:0:2:0"
EndSection

(i tried both of "Backlight" and  "intel_backlight" options)

-and when i start the xubuntu power manager and try  to set backlight
(which is installed in lubuntu) i can see  the backlight widget on the
screen but it doesn't effect anything, still backlight goes to max or
min, but the widget's animation cannot go further than one step, it
stucks on the first step.

- i tried to change the value of brightness file under the directory /sys/class/backlight/ideapad
but sudo does not work here, it says permission denied, but when i read the value of actual_brightness file i can see 0 or 10 ( of course just these)

First of all i don't think this is related to kernel, and i don't wanna
try upstream kernel. I think it is related to xserver package and ubuntu
acpi management and many configurations file in ubuntu that i don't know
exactly how many are and where they are...

Thanks in advance
--- 
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: i386
CurrentDesktop: LXDE
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2014-03-10 (190 days ago)
InstallationMedia: Lubuntu 14.04 "Trusty Tahr" - Alpha i386 (20140225)
Package: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.1
PackageArchitecture: i386
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Tags:  trusty
Uname: Linux 3.13.0-35-generic i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: apport-collected backlight trusty
-- 
lubuntu 14.04 backlight maximum or minimum on lenovo laptop
https://bugs.launchpad.net/bugs/1370505
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