Interesting, ONLY mplayer have sound.

[chaoshydra]

Ok, we've seen lots of mplayer don't have sound threads, but this is different. I am running Kubuntu 12.04 up to date with bunblebee-ed nevidia graphic card laptop. The audio devices checks out good

aplay -l
**** PLAYBACK 硬體裝置清單 ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
  子设备: 0/1
  子设备 #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
  子设备: 1/1
  子设备 #0: subdevice #0

The problem is there is no sound in neither system notification nor audacious nor adobe flash, etc. Only Mplayer has no problem running alsa HDMI. I think I got some of the KDE set up wrong.
I would really like some good advice on this. Thanks in Advance!

[SeijiSensei]

I find installing pavucontrol to provide the easiest interface to managing multiple sound sources. I have both an HDMI connection to a TV and an analog audio connection to my old A/V receiver. Mplayer (actually SMPlayer in my case) can manage the outputs itself, but for other purposes I use pavucontrol. I find it much more effective than the mixer (KMix) that comes with Kubuntu and easier to manage than changing the configuration in System Settings > Multimedia.

I ended up removing the Kubuntu volume control from the system tray and adding an icon for pavucontrol to the panel.