Thanks for the responses! I compiled and installed hda-emu, but after
that I'm completely lost regarding how to use it to get the pin-ctls
values.

I haven't finished trying all of your suggestions yet (will post more
results as I go through them), but as for the output of amixer -c0
contents, the Boolean values appear to behave properly.

With the headphones plugged into the front headphone jack:
numid=40,iface=CARD,name='Front Headphone Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=on
numid=34,iface=CARD,name='Front Mic Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=36,iface=CARD,name='Line Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=39,iface=CARD,name='Line Out CLFE Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=37,iface=CARD,name='Line Out Front Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=38,iface=CARD,name='Line Out Surround Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=35,iface=CARD,name='Rear Mic Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=41,iface=CARD,name='SPDIF Phantom Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=on
numid=33,iface=MIXER,name='Master Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=32,iface=MIXER,name='Master Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=45
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=10,iface=MIXER,name='Headphone Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=9,iface=MIXER,name='Headphone Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=42,iface=MIXER,name='PCM Playback Volume'
  ; type=INTEGER,access=rw---RW-,values=2,min=0,max=255,step=0
  : values=255,255
  | dBscale-min=-51.00dB,step=0.20dB,mute=0
numid=24,iface=MIXER,name='Front Mic Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=3,3
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=12,iface=MIXER,name='Front Mic Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=11,iface=MIXER,name='Front Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=2,iface=MIXER,name='Front Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=1,iface=MIXER,name='Front Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=4,iface=MIXER,name='Surround Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=3,iface=MIXER,name='Surround Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=0,0
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=7,iface=MIXER,name='Center Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=5,iface=MIXER,name='Center Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=0
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=8,iface=MIXER,name='LFE Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=6,iface=MIXER,name='LFE Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=0
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=26,iface=MIXER,name='Line Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=0,0
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=16,iface=MIXER,name='Line Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=15,iface=MIXER,name='Line Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=21,iface=MIXER,name='Capture Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=23,iface=MIXER,name='Capture Switch',index=1
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=20,iface=MIXER,name='Capture Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=46,step=0
  : values=44,44
  | dBscale-min=-16.00dB,step=1.00dB,mute=0
numid=22,iface=MIXER,name='Capture Volume',index=1
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=46,step=0
  : values=0,0
  | dBscale-min=-16.00dB,step=1.00dB,mute=0
numid=31,iface=MIXER,name='IEC958 Default PCM Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=27,iface=MIXER,name='IEC958 Playback Con Mask'
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0xff AES2=0x00 AES3=0x00]
numid=28,iface=MIXER,name='IEC958 Playback Pro Mask'
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0x00 AES2=0x00 AES3=0x00]
numid=29,iface=MIXER,name='IEC958 Playback Default'
  ; type=IEC958,access=rw------,values=1
  : values=[AES0=0x04 AES1=0x00 AES2=0x00 AES3=0x00]
numid=30,iface=MIXER,name='IEC958 Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=17,iface=MIXER,name='Auto-Mute Mode'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'Disabled'
  ; Item #1 'Enabled'
  : values=1
numid=43,iface=MIXER,name='Digital Capture Volume'
  ; type=INTEGER,access=rw---RW-,values=2,min=0,max=120,step=0
  : values=60,60
  | dBscale-min=-30.00dB,step=0.50dB,mute=0
numid=18,iface=MIXER,name='Input Source'
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'Front Mic'
  ; Item #1 'Rear Mic'
  ; Item #2 'Line'
  : values=0
numid=19,iface=MIXER,name='Input Source',index=1
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'Front Mic'
  ; Item #1 'Rear Mic'
  ; Item #2 'Line'
  : values=1
numid=25,iface=MIXER,name='Rear Mic Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=0,0
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=14,iface=MIXER,name='Rear Mic Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=13,iface=MIXER,name='Rear Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0

With the headphones plugged into the line-out (front speakers) jack on the rear 
of the computer case:
numid=40,iface=CARD,name='Front Headphone Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=34,iface=CARD,name='Front Mic Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=36,iface=CARD,name='Line Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=39,iface=CARD,name='Line Out CLFE Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=37,iface=CARD,name='Line Out Front Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=on
numid=38,iface=CARD,name='Line Out Surround Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=35,iface=CARD,name='Rear Mic Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=41,iface=CARD,name='SPDIF Phantom Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=on
numid=33,iface=MIXER,name='Master Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=32,iface=MIXER,name='Master Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=45
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=10,iface=MIXER,name='Headphone Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=9,iface=MIXER,name='Headphone Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=42,iface=MIXER,name='PCM Playback Volume'
  ; type=INTEGER,access=rw---RW-,values=2,min=0,max=255,step=0
  : values=255,255
  | dBscale-min=-51.00dB,step=0.20dB,mute=0
numid=24,iface=MIXER,name='Front Mic Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=3,3
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=12,iface=MIXER,name='Front Mic Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=11,iface=MIXER,name='Front Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=2,iface=MIXER,name='Front Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=1,iface=MIXER,name='Front Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=4,iface=MIXER,name='Surround Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=3,iface=MIXER,name='Surround Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=7,iface=MIXER,name='Center Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=5,iface=MIXER,name='Center Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=8,iface=MIXER,name='LFE Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=6,iface=MIXER,name='LFE Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=26,iface=MIXER,name='Line Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=0,0
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=16,iface=MIXER,name='Line Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=15,iface=MIXER,name='Line Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=21,iface=MIXER,name='Capture Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=23,iface=MIXER,name='Capture Switch',index=1
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=20,iface=MIXER,name='Capture Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=46,step=0
  : values=44,44
  | dBscale-min=-16.00dB,step=1.00dB,mute=0
numid=22,iface=MIXER,name='Capture Volume',index=1
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=46,step=0
  : values=0,0
  | dBscale-min=-16.00dB,step=1.00dB,mute=0
numid=31,iface=MIXER,name='IEC958 Default PCM Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=27,iface=MIXER,name='IEC958 Playback Con Mask'
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0xff AES2=0x00 AES3=0x00]
numid=28,iface=MIXER,name='IEC958 Playback Pro Mask'
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0x00 AES2=0x00 AES3=0x00]
numid=29,iface=MIXER,name='IEC958 Playback Default'
  ; type=IEC958,access=rw------,values=1
  : values=[AES0=0x04 AES1=0x00 AES2=0x00 AES3=0x00]
numid=30,iface=MIXER,name='IEC958 Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=17,iface=MIXER,name='Auto-Mute Mode'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'Disabled'
  ; Item #1 'Enabled'
  : values=1
numid=43,iface=MIXER,name='Digital Capture Volume'
  ; type=INTEGER,access=rw---RW-,values=2,min=0,max=120,step=0
  : values=60,60
  | dBscale-min=-30.00dB,step=0.50dB,mute=0
numid=18,iface=MIXER,name='Input Source'
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'Front Mic'
  ; Item #1 'Rear Mic'
  ; Item #2 'Line'
  : values=0
numid=19,iface=MIXER,name='Input Source',index=1
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'Front Mic'
  ; Item #1 'Rear Mic'
  ; Item #2 'Line'
  : values=1
numid=25,iface=MIXER,name='Rear Mic Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=0,0
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=14,iface=MIXER,name='Rear Mic Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=13,iface=MIXER,name='Rear Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0

With the headphones unplugged completely:
numid=40,iface=CARD,name='Front Headphone Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=34,iface=CARD,name='Front Mic Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=36,iface=CARD,name='Line Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=39,iface=CARD,name='Line Out CLFE Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=37,iface=CARD,name='Line Out Front Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=38,iface=CARD,name='Line Out Surround Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=35,iface=CARD,name='Rear Mic Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=41,iface=CARD,name='SPDIF Phantom Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=on
numid=33,iface=MIXER,name='Master Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=32,iface=MIXER,name='Master Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=45
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=10,iface=MIXER,name='Headphone Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=9,iface=MIXER,name='Headphone Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=42,iface=MIXER,name='PCM Playback Volume'
  ; type=INTEGER,access=rw---RW-,values=2,min=0,max=255,step=0
  : values=255,255
  | dBscale-min=-51.00dB,step=0.20dB,mute=0
numid=24,iface=MIXER,name='Front Mic Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=3,3
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=12,iface=MIXER,name='Front Mic Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=11,iface=MIXER,name='Front Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=2,iface=MIXER,name='Front Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=1,iface=MIXER,name='Front Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=4,iface=MIXER,name='Surround Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=3,iface=MIXER,name='Surround Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=64,step=0
  : values=64,64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=7,iface=MIXER,name='Center Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=5,iface=MIXER,name='Center Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=8,iface=MIXER,name='LFE Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=6,iface=MIXER,name='LFE Playback Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=64,step=0
  : values=64
  | dBscale-min=-64.00dB,step=1.00dB,mute=0
numid=26,iface=MIXER,name='Line Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=0,0
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=16,iface=MIXER,name='Line Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=15,iface=MIXER,name='Line Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=21,iface=MIXER,name='Capture Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=23,iface=MIXER,name='Capture Switch',index=1
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=20,iface=MIXER,name='Capture Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=46,step=0
  : values=44,44
  | dBscale-min=-16.00dB,step=1.00dB,mute=0
numid=22,iface=MIXER,name='Capture Volume',index=1
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=46,step=0
  : values=0,0
  | dBscale-min=-16.00dB,step=1.00dB,mute=0
numid=31,iface=MIXER,name='IEC958 Default PCM Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=27,iface=MIXER,name='IEC958 Playback Con Mask'
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0xff AES2=0x00 AES3=0x00]
numid=28,iface=MIXER,name='IEC958 Playback Pro Mask'
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0x00 AES2=0x00 AES3=0x00]
numid=29,iface=MIXER,name='IEC958 Playback Default'
  ; type=IEC958,access=rw------,values=1
  : values=[AES0=0x04 AES1=0x00 AES2=0x00 AES3=0x00]
numid=30,iface=MIXER,name='IEC958 Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=17,iface=MIXER,name='Auto-Mute Mode'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'Disabled'
  ; Item #1 'Enabled'
  : values=1
numid=43,iface=MIXER,name='Digital Capture Volume'
  ; type=INTEGER,access=rw---RW-,values=2,min=0,max=120,step=0
  : values=60,60
  | dBscale-min=-30.00dB,step=0.50dB,mute=0
numid=18,iface=MIXER,name='Input Source'
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'Front Mic'
  ; Item #1 'Rear Mic'
  ; Item #2 'Line'
  : values=0
numid=19,iface=MIXER,name='Input Source',index=1
  ; type=ENUMERATED,access=rw------,values=1,items=3
  ; Item #0 'Front Mic'
  ; Item #1 'Rear Mic'
  ; Item #2 'Line'
  : values=1
numid=25,iface=MIXER,name='Rear Mic Boost Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
  : values=0,0
  | dBscale-min=0.00dB,step=10.00dB,mute=0
numid=14,iface=MIXER,name='Rear Mic Playback Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=off,off
numid=13,iface=MIXER,name='Rear Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0

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https://bugs.launchpad.net/bugs/1208218

Title:
  intermittent left-channel audio distortion

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  Since I installed this version of Ubuntu (Xubuntu 12.04 upgraded to
  Ubuntu Studio), I occasionally get crackly or fuzzy distortion in the
  left audio channel.

  It doesn't happen completely consistently, but it often happens while
  playing Flash videos in Firefox or editing audio in Audacity. It also
  happens pretty much every time I try to use Pure Data with JACK, and I
  can also replicate it by opening Audacity while using JACK (which will
  create distortion in all audio playing through JACK). But JACK doesn't
  need to be running at all for the problem to occur.

  Entering this command:
  rm -r ~/.pulse ~/.asound* ~/.pulse-cookie
  in the terminal is the only way I can fix the problem, and sometimes it takes 
several tries. I also have to restart some open applications after doing that 
to get them to play audio again.

  I tried the suggestions on
  https://wiki.ubuntu.com/Audio/PositionReporting , but that didn't
  solve the problem.

  I have PulseAudio 1:1.1-0ubuntu15.3 installed.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: pulseaudio 1:1.1-0ubuntu15.3
  ProcVersionSignature: Ubuntu 3.2.0-51.53-lowlatency 3.2.48
  Uname: Linux 3.2.0-51-lowlatency x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  stefan     2004 F.... xfce4-volumed
                        stefan     2051 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfe7f4000 irq 16'
     Mixer name : 'Realtek ALC892'
     Components : 'HDA:10ec0892,18491892,00100302'
     Controls      : 41
     Simple ctrls  : 20
  CurrentDmesg:
   [   38.380324] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
   [   48.962046] eth0: no IPv6 routers present
  Date: Sun Aug  4 13:13:19 2013
  InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120822.1)
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/24/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.20
  dmi.board.name: 880GXH/USB3
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.20:bd06/24/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn880GXH/USB3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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