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    SubjectLCD brightness not reflected at brightness file
    Hello list,

    I have compiled linux kernel 3.0.1. The LCD current brightness
    is show by /sys/class/backlight/acpi_video0/actual_brightness

    I can also control brightness by <Fn> key and correctly read by
    /sys/class/backlight/acpi_video0/actual_brightness

    BUT

    echo 0 > /sys/class/backlight/acpi_video0/brightness

    echo 8 > /sys/class/backlight/acpi_video0/brightness

    etc.... has no effect !!!

    Could anyone give me any clue please ?

    TIA


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