[Bug 55161] New: Backlight Software control is acting wrong

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55161

           Summary: Backlight Software control is acting wrong
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.7 through 3.9rc2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: pqwoerituytrueiwoq at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: Yes


Created an attachment (id=95341)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=95341)
Bullet notes, cause I don't like reading paragraphs

Originally reported it here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1138168

(see attachemnt if you would prefer bullet notes)
With the 3.6.11 kernel I can get the brightness using xbacklight however with
3.7 and up getting the brightness with xbacklight changes the brightness then
reports the new value
When i login the brightness changes to 100% (i have xbacklight set the
brightness via a lightdm config script when the greeter loads)
After the power manager has turned the screen on the brightness return to 100%


I have confirmed this on xubuntu 12.10 and 13.04, i never tried anything older
than 3.6.3 kernel on this notebook

as of the 210 bios update for my notebook the FN+brightness keys broke on the
3.6 kernel (they work on the newer kernels), this is also when i had this the
other issue on the 3.8/3.9/3.7 kernel

If any addition info is needed just specify the kernel version to test (please
don't ask me to compile it, compiling hates me) as well as any kernel boot
paramaters to add/remove

If hardware access is needed, i can setup a spare hdd with xubuntu 13.04 and
rig a mirror to the webcam so you can see the screen brightness and setup a ssh
server on it

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