Thinkpad x230 display brightness

[bezobrazluk at hushmail.com]

hi everyone
i have a x230 and i have problem with acpi

i read and install
	# cd /usr/ports/sysutils/acpi_call && make install clean # kldload
acpi_ibm # kldload acpi_call # acpi_call -p 'VBRC' -i N where N is
0-16. (strangely, 15 is brighter than 16). 
my output for  [ acpi_call -p 'VBRC' -i N ] is "0"

but i can change the brighter . can anyone help me ??
i can't find a command-line for change in the terminal 
or the key FnF8 or FnF9 
thz

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