Note, Ubuntu may have alsa sound drivers installed at /lib/modules/<your kernel version>/ubuntu/sound/..., you may need to remove the dir to allow modprobe search from the default place: /lib/modules/<your kernel verision>/kernel/sound/ (don't forget to rerun /sbin/depmod after removing the old sound directory. Eg: /sbin/depmod -a 2.6.24-24-server).
./configure --with-redhat=no \
--with-cards=dummy,usb-audio,hda-intel,hrtimer,rtctimer \
--with-card-options=all
make && make install
After the first make && make install, copy mod_skypopen/configs/alsa/dummy.c to alsa-driver-1.0.20sound/drivers/dummy.c .
make && make install #again :)The problem is after I did all of them, when I entered modprobe snd_dummy, it always crashed and returned as "killed" on my terminal, I could see it dumped out a huge block or data(numbers, etc) on the host but don't understand the meaning. While if I used the original dummy.c inside alsa-driver-1.0.20, it worked fine.