Okay, I've already solved this but it was an odd problem.
Before triggering the upgrade to 11.10, my sound was working fine. Never actually had a sound issue before with Ubuntu/Xubuntu. Speakers were still working I checked them first. Built-in sound card was still enabled in the bios. From there I moved onto the standard tests to see where the problem was.
illusionist wrote:when was the last time you updated your system ?EDIT: how about pacman -Syyf networkmanagerthanks! that solved my problem but this message still ldconfig: El fichero /usr/lib/libnm-glib.so.4.3.0 está vacío, no se comprueba.
Sorry, I AM using mplayer2 (I'll edit the first post), and unfortunately that method doesn't work.For now I've solved using rsound for mplayer2, and the emulated sound card for the unimportant (youtube, etc) rest.