This bug says Fedora uses alsa by default https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=155421 Desktop - Preferences - More Preferences - Multimedia systems selector Both defaults are alsa, but Test fail on both: "Failed to construct test pipeline for 'ALSA - Advanced Linux Sound Architecture'" When I ran the test, nothing was outputting sound. I also tested this with a fresh user, which didn't have the option to start esd at gnome startup.
It works now, with alsa 1.0.9rc3 (bug 156592). So this wasn't a gstreamer problem.