Persists with kernel version 3.0.0-12.20.
In syslog, there are some messages regarding ALSA and PulseAudio:

Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: snd_pcm_avail() navrátil hodnotu, která je nezvykle vysoká: 
3528320 bajtů (10000 ms). - snd_pcm_avail() returned a value that is unusually 
high: 3528320 bytes (10000 ms).
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: S největší pravděpodobností se jedná o chybu v ovladači ALSA 
"snd_hda_intel". Nahlaste prosím tento problém vývojářům ALSA. - This is most 
likely a bug in the ALSA driver "snd_hda_intel". Please report this problem to 
ALSA developers.
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: snd_pcm_dump():
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Soft volume PCM
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Control: PCM Playback Volume
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: min_dB: -51
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: max_dB: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: resolution: 256
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Its setup is:
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stream       : PLAYBACK
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   access       : MMAP_INTERLEAVED
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   format       : S16_LE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   subformat    : STD
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   channels     : 4
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   rate         : 44100
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   exact rate   : 44100 (44100/1)
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   msbits       : 16
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   buffer_size  : 441040
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_size  : 88208
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_time  : 2000181
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   tstamp_mode  : ENABLE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_step  : 1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   avail_min    : 440158
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_event : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   start_threshold  : -1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stop_threshold   : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_threshold: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_size : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   boundary     : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Its setup is:
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stream       : PLAYBACK
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   access       : MMAP_INTERLEAVED
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   format       : S16_LE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   subformat    : STD
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   channels     : 4
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   rate         : 44100
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   exact rate   : 44100 (44100/1)
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   msbits       : 16
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   buffer_size  : 441040
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_size  : 88208
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_time  : 2000181
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   tstamp_mode  : ENABLE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_step  : 1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   avail_min    : 440158
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_event : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   start_threshold  : -1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stop_threshold   : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_threshold: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_size : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   boundary     : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   appl_ptr     : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   hw_ptr       : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: snd_pcm_mmap_begin() navrátil hodnotu, která je nezvykle vysoká: 
3528320 bajtů (10000 ms). - snd_pcm_avail() returned a value that is unusually 
high: 3528320 bytes (10000 ms).
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: S největší pravděpodobností se jedná o chybu v ovladači ALSA 
"snd_hda_intel". Nahlaste prosím tento problém vývojářům ALSA. - This is most 
likely a bug in the ALSA driver "snd_hda_intel". Please report this problem to 
ALSA developers.
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: snd_pcm_dump():
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Soft volume PCM
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Control: PCM Playback Volume
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: min_dB: -51
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: max_dB: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: resolution: 256
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Its setup is:
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stream       : PLAYBACK
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   access       : MMAP_INTERLEAVED
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   format       : S16_LE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   subformat    : STD
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   channels     : 4
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   rate         : 44100
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   exact rate   : 44100 (44100/1)
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   msbits       : 16
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   buffer_size  : 441040
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_size  : 88208
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_time  : 2000181
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   tstamp_mode  : ENABLE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_step  : 1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   avail_min    : 440158
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_event : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   start_threshold  : -1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stop_threshold   : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_threshold: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_size : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   boundary     : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Its setup is:
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stream       : PLAYBACK
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   access       : MMAP_INTERLEAVED
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   format       : S16_LE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   subformat    : STD
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   channels     : 4
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   rate         : 44100
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   exact rate   : 44100 (44100/1)
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   msbits       : 16
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   buffer_size  : 441040
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_size  : 88208
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_time  : 2000181
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   tstamp_mode  : ENABLE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_step  : 1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   avail_min    : 440158
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_event : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   start_threshold  : -1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stop_threshold   : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_threshold: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_size : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   boundary     : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   appl_ptr     : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   hw_ptr       : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: snd_pcm_delay() navrátil hodnotu, která je nezvykle vysoká: 
3528320 bajtů (10000 ms). - snd_pcm_avail() returned a value that is unusually 
high: 3528320 bytes (10000 ms).
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: S největší pravděpodobností se jedná o chybu v ovladači ALSA 
"snd_hda_intel". Nahlaste prosím tento problém vývojářům ALSA. - This is most 
likely a bug in the ALSA driver "snd_hda_intel". Please report this problem to 
ALSA developers.
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: snd_pcm_dump():
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Soft volume PCM
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Control: PCM Playback Volume
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: min_dB: -51
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: max_dB: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: resolution: 256
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Its setup is:
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stream       : PLAYBACK
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   access       : MMAP_INTERLEAVED
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   format       : S16_LE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   subformat    : STD
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   channels     : 4
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   rate         : 44100
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   exact rate   : 44100 (44100/1)
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   msbits       : 16
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   buffer_size  : 441040
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_size  : 88208
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_time  : 2000181
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   tstamp_mode  : ENABLE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_step  : 1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   avail_min    : 440158
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_event : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   start_threshold  : -1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stop_threshold   : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_threshold: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_size : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   boundary     : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c: Its setup is:
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stream       : PLAYBACK
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   access       : MMAP_INTERLEAVED
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   format       : S16_LE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   subformat    : STD
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   channels     : 4
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   rate         : 44100
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   exact rate   : 44100 (44100/1)
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   msbits       : 16
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   buffer_size  : 441040
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_size  : 88208
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_time  : 2000181
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   tstamp_mode  : ENABLE
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_step  : 1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   avail_min    : 440158
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   period_event : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   start_threshold  : -1
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   stop_threshold   : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_threshold: 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   silence_size : 0
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   boundary     : 7758857733029232640
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   appl_ptr     : 441040
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [alsa-sink] 
alsa-util.c:   hw_ptr       : 0
Oct 10 13:19:27 Oneiric-beta1-Aspire-8943G rtkit-daemon[1545]: Successfully 
made thread 1691 of process 1666 (n/a) owned by '1000' RT at priority 5.
Oct 10 13:19:27 Oneiric-beta1-Aspire-8943G rtkit-daemon[1545]: Supervising 8 
threads of 2 processes of 2 users.
Oct 10 15:19:27 Oneiric-beta1-Aspire-8943G pulseaudio[1666]: [pulseaudio] 
bluetooth-util.c: Error from RegisterEndpoint reply: 
org.freedesktop.DBus.Error.UnknownMethod
Oct 10 15:20:11  pulseaudio[1666]: last message repeated 2 times

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/839800

Title:
  5.1 built-in surround detected as 4.0 on Acer Aspire 8943G with ALC670

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