I am running Karmic (9.10) on my macbook air (2,1) and although many things work fine (I wrote about it here: https://help.ubuntu.com/community/MacBookAir2-1/Karmic) one of the last things that doesn't work is setting the screen brightness. The FN-F11/F12 combo does bring up the brightness adjustment notification window (top right) and I can change the setting, but it has no effect UNTILL I reboot or suspend to RAM and reboot.
A related issue is that the brightness doesn't automatically adjust to the surrounding brightness.
Thanks!
Berco
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