Comment 148 for bug 191027

dx9s...

I don´t really understand very well what is the reason, but issuing "asoundconf -set-pulse" at a console also works for me. Now I can hear the drums and the login sound in gdm, and once inside the gnome session everything seems ok (totem, sound settings in the panel, etc.)

I guess that the files created with the command you suggested in some way prepare Alsa applications to use pulseaudio as the default sink. So the gdm sounds now go through alsa (which then uses pulseaudio) while other applications like Totem go directly through pulse, but all of this works fine at the same time.

Thanks for your suggestion, which I think that could be the base for a fix if someone can explain the logic behind.