(In reply to comment #7)
> Ok, this fix work, but cause another problem (tested with 3.15.5+patch and
> 3.16.1).
> 
> When display goes off, backlight goes off.
> When display goes on, backlight is set to MAX.
> When display goes off again, backligh remains MAX.
> After pressing key, LCD works, backlight stay at MAX level.
> When display goes off, backlight is still MAX.

Does the backlight respond correctly when adjusted via the sysfs blacklight
interface?