I have an HP Envy 15t-j000 installed with Ubuntu 13.10. When connecting my computer to a monitor via HDMI, I have no problem getting the sound to come from the monitor speakers. My problem is that after disconnecting the HDMI cable, my computer's speakers don't produce any sound from YouTube, VLC, Spotify, and etc. What's odd though is that system sounds are still there, such as the sounds you get when pushing on the increase or decrease volume buttons. Also, the sound test in sound settings works perfectly. Any solutions? Could it just be a bug because this is a new release?
I have the same problem. The solution i found is changing the profile hardware to "Stéréo analogique Output" in Audio hardware setup (click on mixer -> mixer -> settings -> audio setup). It seems that when connecting an external monitor, ubuntu automatically changes the audio hardware to HDMI output.