Comment 3 for bug 466936

I can confirm that I'm have the same distortion problem when I try the Analog Stereo 5.1 and 4.1 surround sound settings. I haven't been able to get it to go away completely when adjusting the settings and volume, but those adjustments do determine how bad it is.

When listening to music in Rhythmbox, It also sounds like the volume of the right speakers is fluctuating up and down about once per second or less, regardless of the codec (I tried mp3, flac, and wma).

When watching an HD video in Totem Movie Player, it sounds like the audio is switching back and forth between the left and right speakers or like an echo.

I haven't noticed any of these problems when it is set to Analog Stereo Duplex

I just upgraded to Karmic today.

My surround sound worked great in Jaunty. Now it's completely useless.

$ lspci | grep audio
00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio Controller (rev a2)

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: CK804 [NVidia CK804], device 0: Intel ICH [NVidia CK804]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: CK804 [NVidia CK804], device 2: Intel ICH - IEC958 [NVidia CK804 - IEC958]
  Subdevices: 1/1
  Subdevice #0: subdevice #0