I just got the sweet new Acer Aspire One 532h with the new Atom N450.
The netbook runs beautifully with Ubuntu 9.10 Karmic, except I can't seem to get the microphone to work.
I ran sudo apt-get install linux-backports-modules-alsa-karmic-generic, after googling that this fixed the problem on some other Acers, but that did not work.
I also tried compiling alsa-driver-1.0.20 according to the instructions here:
Nothing has worked so far, any ideas how I can fix it?