My sound hardware is not recognized

[Macarena]

I've just installed karmic koala and teh sound doesn't work.

ProblemType: Bug
Architecture: i386
CheckboxCommand: gst_pipeline_test -t 2 'audiotestsrc wave=sine freq=512 ! audioconvert ! audioresample ! gconfaudiosink'
CheckboxDescription:
 Click the Test button to play a sound on the automatically detected playback device.

 Você ouve o som?
CheckboxSubmission: 085dfd893d54a38e28f59e774fbcca3b
CheckboxSystem: 050aaa589167804fa24d9ed48c012062
CheckboxTest: playback_auto
Date: Fri Oct 30 04:01:37 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
NonfreeKernelModules: nvidia
Package: python-gst0.10 0.10.17-1
ProcEnviron:
 SHELL=/bin/bash
 LANG=pt_BR.UTF-8
 LANGUAGE=pt_BR.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: gst0.10-python
Tags: checkbox-bug
Uname: Linux 2.6.31-14-generic i686
XsessionErrors:
 (gnome-settings-daemon:3854): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:3854): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:3954): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:3976): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-panel:3953): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -5 and height 24