I've noticed that this gets printed to syslog if I log out of Gnome
Shell and open a Unity session:
E: alsa-util.c: snd_pcm_avail_delay() returned strange values: delay 0 is less
than avail 40.
E: alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'.
Please report this issue to the ALSA developers.
E: alsa-util.c: snd_pcm_dump():
E: alsa-util.c: Soft volume PCM
E: alsa-util.c: Control: PCM Playback Volume
E: alsa-util.c: min_dB: -51
E: alsa-util.c: max_dB: 0
E: alsa-util.c: resolution: 256
E: alsa-util.c: Its setup is:
E: alsa-util.c: stream : CAPTURE
E: alsa-util.c: access : MMAP_INTERLEAVED
E: alsa-util.c: format : S16_LE
E: alsa-util.c: subformat : STD
E: alsa-util.c: channels : 2
E: alsa-util.c: rate : 44100
E: alsa-util.c: exact rate : 44100 (44100/1)
E: alsa-util.c: msbits : 16
E: alsa-util.c: buffer_size : 88192
E: alsa-util.c: period_size : 44096
E: alsa-util.c: period_time : 999909
E: alsa-util.c: tstamp_mode : ENABLE
E: alsa-util.c: period_step : 1
E: alsa-util.c: avail_min : 87310
E: alsa-util.c: period_event : 0
E: alsa-util.c: start_threshold : -1
E: alsa-util.c: stop_threshold : 6205960286516543488
E: alsa-util.c: silence_threshold: 0
E: alsa-util.c: silence_size : 0
E: alsa-util.c: boundary : 6205960286516543488
E: alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0
E: alsa-util.c: Its setup is:
E: alsa-util.c: stream : CAPTURE
E: alsa-util.c: access : MMAP_INTERLEAVED
E: alsa-util.c: format : S16_LE
E: alsa-util.c: subformat : STD
E: alsa-util.c: channels : 2
E: alsa-util.c: rate : 44100
E: alsa-util.c: exact rate : 44100 (44100/1)
E: alsa-util.c: msbits : 16
E: alsa-util.c: buffer_size : 88192
E: alsa-util.c: period_size : 44096
E: alsa-util.c: period_time : 999909
E: alsa-util.c: tstamp_mode : ENABLE
E: alsa-util.c: period_step : 1
E: alsa-util.c: avail_min : 87310
E: alsa-util.c: period_event : 0
E: alsa-util.c: start_threshold : -1
E: alsa-util.c: stop_threshold : 6205960286516543488
E: alsa-util.c: silence_threshold: 0
E: alsa-util.c: silence_size : 0
E: alsa-util.c: boundary : 6205960286516543488
E: alsa-util.c: appl_ptr : 87344
E: alsa-util.c: hw_ptr : 87344
** Changed in: ubuntu
Status: Incomplete => New
--
logging into a different session breaks sound until reboot
https://bugs.launchpad.net/bugs/665080
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