http://bugzilla.kernel.org/show_bug.cgi?id=12302

           Summary: Backward brigthess level
           Product: ACPI
           Version: 2.5
     KernelVersion: 2.6.28
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Video
        AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
        ReportedBy: sfstu...@mail.ru


Latest working kernel version: 2.6.27.10
Earliest failing kernel version: 2.6.28
Distribution: all
Hardware Environment: Notebook asus X51L
Software Environment: all
Problem Description:backward brigthess level

Steps to reproduce: start Kpowersave and select brigthess level 

Asus X51L backward brigthess trouble.

/proc/acpi/video/VGA/LCDD/brightness - work fine 0-min 15-max
/sys/class/backlight/acpi_video0/brightness - trouble 0-max 15-min

Kpowersave work bad - 100%-min 1%-max

In dmesg:

Dec 25 23:47:08 sfstudio kernel: 
ACPI: Please implement acpi_video_bus_ROM_seq_show
Dec 26 01:34:14 sfstudio kernel: asus-laptop: Asus Laptop Support version 0.42
Dec 26 01:34:14 sfstudio kernel: asus-laptop:   X51L model detected
Dec 26 01:34:14 sfstudio kernel: asus-laptop: Brightness ignored, must be
controlled by ACPI video driver
Dec 26 01:34:14 sfstudio kernel: Registered led device: asus::mail
Dec 26 01:37:29 sfstudio kernel: asus-laptop: Asus Laptop Support version 0.42
Dec 26 01:37:29 sfstudio kernel: asus-laptop:   X51L model detected
Dec 26 01:37:29 sfstudio kernel: asus-laptop: Brightness ignored, must be
controlled by ACPI video driver
Dec 26 01:37:29 sfstudio kernel: Registered led device: asus::mail
Dec 26 01:39:20 sfstudio kernel: asus-laptop: Asus Laptop Support version 0.42
Dec 26 01:39:20 sfstudio kernel: asus-laptop:   X51L model detected
Dec 26 01:39:20 sfstudio kernel: asus-laptop: Brightness ignored, must be
controlled by ACPI video driver
Dec 26 01:39:20 sfstudio kernel: Registered led device: asus::mail
Dec 26 01:40:31 sfstudio kernel: asus-laptop: Asus Laptop Support version 0.42
Dec 26 01:40:31 sfstudio kernel: asus-laptop:   X51L model detected
Dec 26 01:40:31 sfstudio kernel: asus-laptop: Brightness ignored, must be
controlled by ACPI video driver
Dec 26 01:40:31 sfstudio kernel: Registered led device: asus::mail

Kernel:
[r...@sfstudio kernel]# uname -a
Linux sfstudio.sadnet.lo 2.6.28 #2 SMP PREEMPT Thu Dec 25 17:14:54 OMST 2008
i686 Intel(R) Celeron(R) CPU          540  @ 1.86GHz GNU/Linux


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