(T530 with openSUSE) Brightness won't change after mainboard replacement

Hi!
The mainboard of my ThinkPad  T530  2429  6JG was replaced today. Now the brightness control doesn't work anymore. I'm using Linux (opensuse 12.3). The brightness keys on the keyboard seem to work, as the usual "brightness control animation" is shown. Also the file /sys/class/backlight/acpi_video0/brightness is updated correctly. However, the screen brightness just won't change, neigher up nor down. There were no issues with the old board and I haven't done any changes to my operating system. Therefore it must be an issue with the board. Does anyone know if there's been a recent change in firmware etc.? (The new mainboard is probably from April 2013)
By the way: In Windows 7 (I have both systems on my HDD) the brightness can be changed without any problems.
Many thanks!!
Jan

got same problem... need to change acpi_os
http://www.laboiteaprog.com/2013/04/lenovo-s430-et-linux.html

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