After installing 12.04 Precise on my PC, I have encountered some problems with audio output which did no occur when using Lucid.

The sound is choppy and distorted in the lower tones. As I have no experience in setting/testing and doing anything with Audio Devices, I need help even to diagnose the problem.

Update

$ sudo lshw -c multimedia



  *-multimedia  



       description: Audio device

       product: Radeon X1200 Series Audio Controller

       vendor: Hynix Semiconductor (Hyundai Electronics)

       physical id: 5.2

       bus info: pci@0000:01:05.2

       version: 00

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi bus_master cap_list

       configuration: driver=snd_hda_intel latency=32

       resources: irq:19 memory:fdafc000-fdafffff

  *-multimedia

       description: Audio device

       product: SBx00 Azalia (Intel HDA)

       vendor: Hynix Semiconductor (Hyundai Electronics)

       physical id: 14.2

       bus info: pci@0000:00:14.2

       version: 00

       width: 64 bits

       clock: 33MHz

       capabilities: pm bus_master cap_list

       configuration: driver=snd_hda_intel latency=32

       resources: irq:16 memory:fe024000-fe027fff

Update 2

It has something to do with the volume. If the audio is quiet it is not choppy, if the sound is loud then it begins to be choppy.