Hi David. I looked at my friend's laptop. Your hunch was right. The DMI machine ID has changed to "Macbook2,1". I added an extra match section to the fdi file... <match key="smbios.system.product" string="MacBook2,1"> <spawn udi="/org/freedesktop/Hal/devices/macbook_backlight"/> </match> works like a charm now :) Cheers