Very annoying….. after upgrading to Ubuntu 9.10 amd64 on my desktop my speakers started to crackle whenever sound needed to be played after a period of silence. It turns out with a high def soundcard the power saving feature introduced in 9.10 will cause the crackle to sound whenever the sound system is “woken up” (best way I can describe it).

To fix this edit /etc/modprobe.d/alsa-base.conf

Comment out the last line, it should look like this:
#options snd-hda-intel power_save=10 power_save_controller=N in the file /etc/modprobe.d/alsa-base.conf

i have an 32 bit version of sopcast. in order for it to function properly in ubuntu 9.10 amd64 it requires a 32bit version of libstdc++5, not a 64bit version. Therefore the amd54 deb of libstdc++ is useless. get the x86 version instead.

wget http://frozenfox.freehostia.com/cappy/getlibs-all.deb
wget http://nl.archive.ubuntu.com/ubuntu/pool/universe/g/gcc-3.3/libstdc++5_3.3.6-17ubuntu1_i386.deb
sudo dpkg -i getlibs-all.deb
getlibs -i libstdc++5_3.3.6-17ubuntu1_i386.deb