acpi_video on ThinkPad E530

[Alexandr]

Hello!

 On my laptop with acpi_video loaded brightness control via Fn-keys
doesn't work. The only way to change brightness is using
dev.acpi_ibm.0.lcd_brightness, for example:

/bin/sh -c 'LEVEL=$(/sbin/sysctl -n dev.acpi_ibm.0.lcd_brightness)
;/sbin/sysctl dev.acpi_ibm.0.lcd_brightness=$(/bin/expr $LEVEL + 1)'

When I press Fn-key I see, that hw.acpi.video.lcd0.brightness is
changed, but nothing happens on screen. I think it because of
hw.acpi.video.lcd0.active=0, but I cannot change it.

With acpi_ibm and without acpi_video Fn-keys works well.