Comment 11 for bug 525328

I have the same problem on an acer Apire 7740 with the following hardware:
This crackling noise also occurs on recorded audio from Line In.

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC670 Analog [ALC670 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC670 Digital [ALC670 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 3: INTEL HDMI 0 [INTEL HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 7: INTEL HDMI 1 [INTEL HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I am using the following driver from the Ubuntu Audio Dev team PPA

linux-also-driver-modules=2.6.32-21-generic

John