With the removal of gnome volume manager, you can be left without an obvious way to adjust ALSA sound levels after an upgrade. If they are set too low, raising the pulse audio sound levels may not work acceptably. The way to deal with this is to install alsa-utils and run "alsamixer -c0" from a shell prompt. alsamixer is a curses program that will let you adjust sound levels for alsa devices. Once running it you can get help by typing a question mark.