Provided by: pulseaudio_13.99.1-1ubuntu3.13_amd64 bug


       pulse-daemon.conf - PulseAudio daemon configuration file







       The  PulseAudio  sound  server reads configuration directives from a configuration file on
       startup. If the per-user file ~/.config/pulse/daemon.conf exists, it  is  used,  otherwise
       the  system  configuration  file /etc/pulse/daemon.conf is used. In addition to those main
       files,  configuration  directives  can  also   be   put   in   files   under   directories
       ~/.config/pulse/daemon.conf.d/ and /etc/pulse/daemon.conf.d/. Those files have to have the
       .conf file name extension, but otherwise the file names can be chosen  freely.  The  files
       under daemon.conf.d are processed in alphabetical order. In case the same option is set in
       multiple files, the last  file  to  set  an  option  overrides  earlier  files.  The  main
       daemon.conf  file is processed first, so options set in files under daemon.conf.d override
       the main file.

       Please  note  that  the  server  also  reads  a  configuration  script  on  startup.   See

       The   configuration  file  is  a  simple  collection  of  variable  declarations.  If  the
       configuration file parser encounters either ; or # it ignores the rest of the  line  until
       its end.

       For  the  settings  that  take  a  boolean  argument  the  values  true, yes, on and 1 are
       equivalent, resp. false, no, off, 0.


       daemonize= Daemonize after startup. Takes a boolean value, defaults to no. The --daemonize
       command line option takes precedence.

       fail=  Fail  to  start  up if any of the directives in the configuration script
       fail. Takes a boolean argument, defaults to yes. The  --fail  command  line  option  takes

       allow-module-loading=  Allow/disallow  module  loading  after  startup. This is a security
       feature that if disabled makes sure that  no  further  modules  may  be  loaded  into  the
       PulseAudio  server after startup completed. It is recommended to disable this when system-
       instance is enabled. Please note that certain features  like  automatic  hot-plug  support
       will  not  work  if this option is enabled. Takes a boolean argument, defaults to yes. The
       --disallow-module-loading command line option takes precedence.

       allow-exit= Allow/disallow exit on user request. Defaults to yes.

       resample-method= The resampling algorithm to use. Use one of  src-sinc-best-quality,  src-
       sinc-medium-quality,  src-sinc-fastest,  src-zero-order-hold,  src-linear, trivial, speex-
       float-N, speex-fixed-N, ffmpeg, soxr-mq,  soxr-hq,  soxr-vhq.  See  the  documentation  of
       libsamplerate  and  speex  for  explanations  of  the  different  src- and speex- methods,
       respectively. The method trivial is the most basic algorithm implemented. If you're  tight
       on  CPU  consider  using this. On the other hand it has the worst quality of them all. The
       Speex resamplers take an integer quality setting in the  range  0..10  (bad...good).  They
       exist  in  two  flavours: fixed and float. The former uses fixed point numbers, the latter
       relies on floating point numbers. On most desktop CPUs the float point resampler is a  lot
       faster,  and  it also offers slightly better quality. The soxr-family methods are based on
       libsoxr, a resampler library from the SoX sound processing utility. The mq variant has the
       best  performance of the three. The hq is more expensive and, according to SoX developers,
       is considered the best choice for audio of up to 16 bits per sample. The vhq  variant  has
       more  precision  than  hq  and  is  more  suitable for larger samples. The Soxr resamplers
       generally offer better quality at less CPU compared to other resamplers,  such  as  speex.
       The  downside is that they can add a significant delay to the output (usually up to around
       20 ms, in rare cases more). See the output of dump-resample-methods for a complete list of
       all  available  resamplers.  Defaults to speex-float-1. The --resample-method command line
       option takes precedence. Note that some modules overwrite  or  allow  overwriting  of  the
       resampler to use.

       avoid-resampling= If set, try to configure the device to avoid resampling. This only works
       on devices which support reconfiguring their rate, and when no other streams  are  already
       playing or capturing audio. The device will also not be configured to a rate less than the
       default and alternate sample rates.

       enable-remixing= If disabled never upmix or downmix channels to  different  channel  maps.
       Instead,  do  a  simple name-based matching only. Defaults to yes. There is no known valid
       use case for setting this option to no, therefore, this option is deprecated  and  may  be
       removed in a future version of PulseAudio.

       remixing-use-all-sink-channels=   If   enabled,  use  all  sink  channels  when  remixing.
       Otherwise, remix to the minimal set of sink channels needed to reproduce all of the source
       channels. (This has no effect on LFE remixing.) Defaults to yes.

       enable-lfe-remixing= This is a way to set remixing-produce-lfe and remixing-consume-lfe to
       the same value at once. This option only exists for  backward  compatibility  and  may  be
       removed in a future version of PulseAudio.

       remixing-produce-lfe=  If  enabled,  and  the  sink  input  does not have the LFE channel,
       synthesize the output LFE channel as a (lowpass-filtered, if lfe-crossover-freq is not  0)
       average  of  all  input  channels.  Also, when lfe-crossover-freq is not 0, filter out low
       frequencies from other channels while producing a synthetic LFE output. If  disabled,  the
       output  LFE channel will only get a signal when an input LFE channel is available as well.
       Defaults to no.

       remixing-consume-lfe= If enabled, and the sink does not have an LFE channel, redirect  the
       input  LFE  channel  (if  any)  to other channels. If disabled, the input LFE channel will
       remain unused unless the sink has the LFE channel as well. Defaults to no.

       lfe-crossover-freq= The crossover frequency (in Hz) for the LFE filter. Set  it  to  0  to
       disable the LFE filter. Defaults to 0.

       use-pid-file=  Create a PID file in the runtime directory ($XDG_RUNTIME_DIR/pulse/pid). If
       this is enabled you may use commands like --kill or --check. If you are planning to  start
       more  than  one  PulseAudio  process  per  user,  you  better disable this option since it
       effectively disables multiple instances. Takes a boolean argument, defaults  to  yes.  The
       --use-pid-file command line option takes precedence.

       cpu-limit=  If disabled do not install the CPU load limiter, even on platforms where it is
       supported. This option is useful when debugging/profiling PulseAudio to disable disturbing
       SIGXCPU signals. Takes a boolean argument, defaults to no. The --no-cpu-limit command line
       argument takes precedence.

       system-instance= Run the daemon as system-wide instance, requires root privileges. Takes a
       boolean argument, defaults to no. The --system command line argument takes precedence.

       local-server-type=  Please  don't  use  this  option  if you don't have to! This option is
       currently only useful when you want D-Bus clients to use a remote server. This option  may
       be  removed in future versions. If you only want to run PulseAudio in the system mode, use
       the system-instance option. This option takes one of user, system or none as the argument.
       This is essentially a duplicate for the system-instance option. The difference is the none
       option, which is useful when you want to use a remote server with D-Bus clients.  If  both
       this  and  system-instance are defined, this option takes precedence. Defaults to whatever
       the system-instance is set.

       enable-shm= Enable data transfer via  POSIX  or  memfd  shared  memory.  Takes  a  boolean
       argument, defaults to yes. The --disable-shm command line argument takes precedence.

       enable-memfd=. Enable memfd shared memory. Takes a boolean argument, defaults to yes.

       shm-size-bytes=  Sets  the  shared  memory  segment size for the daemon, in bytes. If left
       unspecified or is set to 0 it will default to some  system-specific  default,  usually  64
       MiB.  Please  note  that  usually  there  is  no need to change this value, unless you are
       running an OS kernel that does not do memory overcommit.

       lock-memory= Locks the entire PulseAudio process into memory. While  this  might  increase
       drop-out  safety  when used in conjunction with real-time scheduling this takes away a lot
       of memory from other processes  and  might  hence  considerably  slow  down  your  system.
       Defaults to no.

       flat-volumes=  Enable  'flat'  volumes,  i.e. where possible let the sink volume equal the
       maximum of the volumes of the inputs connected to it. Takes a boolean  argument,  defaults
       to no.

       rescue-streams= Enable rescuing of streams if the used sink or source becomes unavailable.
       Takes a boolean argument. If set to yes, pulseaudio will try to move the  streams  from  a
       sink  or  source  that  becomes  unavailable  to the default sink or source. If set to no,
       streams will be killed if the corresponding sink or source disappears. Defaults to yes.


       high-priority= Renice the daemon after startup to become a high-priority process.  This  a
       good idea if you experience drop-outs during playback. However, this is a certain security
       issue, since it works when called SUID root only, or RLIMIT_NICE is used. root is  dropped
       immediately  after  gaining  the  nice  level  on startup, thus it is presumably safe. See
       pulseaudio(1) for more information. Takes a boolean argument, defaults to yes. The --high-
       priority command line option takes precedence.

       realtime-scheduling=  Try  to  acquire  SCHED_FIFO scheduling for the IO threads. The same
       security concerns as mentioned above  apply.  However,  if  PA  enters  an  endless  loop,
       realtime  scheduling  causes  a  system  lockup.  Thus, realtime scheduling should only be
       enabled on trusted machines for now. Please note that only the IO  threads  of  PulseAudio
       are  made  real-time.  The  controlling  thread  is left a normally scheduled thread. Thus
       enabling the high-priority option is orthogonal. See pulseaudio(1) for  more  information.
       Takes  a  boolean  argument,  defaults  to  yes.  The --realtime command line option takes

       realtime-priority= The realtime priority to acquire, if  realtime-scheduling  is  enabled.
       Note:  JACK  uses  10  by  default,  9  for  clients. Thus it is recommended to choose the
       PulseAudio real-time priorities lower. Some PulseAudio threads might choose a  priority  a
       little lower or higher than the specified value. Defaults to 5.

       nice-level=  The  nice level to acquire for the daemon, if high-priority is enabled. Note:
       on some distributions X11 uses -10 by default. Defaults to -11.


       exit-idle-time= Terminate the daemon after the last client quit and this time  in  seconds
       passed. Use a negative value to disable this feature. Defaults to 20. The --exit-idle-time
       command line option takes precedence.

              When PulseAudio runs in the per-user mode and detects a  login  session,  then  any
              positive  value will be reset to 0 so that PulseAudio will terminate immediately on
              logout. A positive value therefore has effect only in environments where there's no
              support  for  login session tracking. A negative value can still be used to disable
              any automatic exit.

              When PulseAudio runs in the system mode, automatic exit is always disabled, so this
              option does nothing.

       scache-idle-time= Unload autoloaded sample cache entries after being idle for this time in
       seconds. Defaults to 20. The --scache-idle-time command line option takes precedence.


       dl-search-path= The path where to look for dynamic shared objects (DSOs/plugins). You  may
       specify  more  than one path separated by colons. The default path depends on compile time
       settings. The --dl-search-path command line option takes precedence.

       default-script-file= The default configuration script  file  to  load.  Specify  an  empty
       string  for  not  loading  a  default  script  file.  The  default  behaviour  is  to load
       ~/.config/pulse/, and if that file does not exist fall back to the  system  wide
       installed   version   /etc/pulse/   If   run   in  system-wide  mode  the  file
       /etc/pulse/ is used instead. If -n is passed on  the  command  line  or  default-
       script-file= is disabled the default configuration script is ignored.

       load-default-script-file=  Load  the  default  configuration  script  file as specified in
       default-script-file=. Defaults to yes.


       log-target= The default log target. Use either stderr, syslog, journal  (optional),  auto,
       file:PATH  or  newfile:PATH.  On  traditional  systems  auto  is  equivalent to syslog. On
       systemd-enabled systems, auto is equivalent to journal, in case daemonize is enabled,  and
       to  stderr  otherwise.  If  set to file:PATH, logging is directed to the file indicated by
       PATH. newfile:PATH is otherwise the same  as  file:PATH,  but  existing  files  are  never
       overwritten.  If  the specified file already exists, a suffix is added to the file name to
       avoid  overwriting.  Defaults  to  auto.  The  --log-target  command  line  option   takes

       log-level=  Log  level,  one  of  debug, info, notice, warning, error. Log messages with a
       lower log level than specified here are not logged. Defaults to  notice.  The  --log-level
       command line option takes precedence. The -v command line option might alter this setting.

       log-meta=  With  each logged message log the code location the message was generated from.
       Defaults to no.

       log-time= With each logged message log the relative time since startup. Defaults to no.

       log-backtrace= When greater than 0, with each logged message log a code stack trace up the
       specified number of stack frames. Defaults to 0.


       See  getrlimit(2)  for  more  information.  Set  to  -1  if PulseAudio shall not touch the
       resource limit. Not all resource limits are available on all operating systems.

       rlimit-as Defaults to -1.

       rlimit-rss Defaults to -1.

       rlimit-core Defaults to -1.

       rlimit-data Defaults to -1.

       rlimit-fsize Defaults to -1.

       rlimit-nofile Defaults to 256.

       rlimit-stack Defaults to -1.

       rlimit-nproc Defaults to -1.

       rlimit-locks Defaults to -1.

       rlimit-sigpending Defaults to -1.

       rlimit-msgqueue Defaults to -1.

       rlimit-memlock Defaults to 16 KiB. Please note that the JACK client libraries may  require
       more locked memory.

       rlimit-nice  Defaults  to  31.  Please make sure that the default nice level as configured
       with nice-level fits in this resource limit, if high-priority is enabled.

       rlimit-rtprio Defaults to 9. Please make sure that the default real-time priority level as
       configured  with realtime-priority= fits in this resource limit, if realtime-scheduling is
       enabled. The JACK client libraries require a real-time priority of 9 by default.

       rlimit-rttime Defaults to 1000000.


       Most drivers try to open the audio device with these settings and then fall back to  lower
       settings.  The  default settings are CD quality: 16bit native endian, 2 channels, 44100 Hz

       default-sample-format= The default sampling format.  Specify  one  of  u8,  s16le,  s16be,
       s24le,  s24be,  s24-32le,  s24-32be,  s32le,  s32be,  float32le,  float32be,  ulaw,  alaw.
       Depending on the endianness of the CPU the formats s16ne, s16re, s24ne,  s24re,  s24-32ne,
       s24-32re,  s32ne,  s32re,  float32ne,  float32re  (for  native,  resp. reverse endian) are
       available as aliases.

       default-sample-rate= The default sample frequency.

       default-sample-channels The default number of channels.

       default-channel-map The default channel map.

       alternate-sample-rate The alternate sample frequency. Sinks and sources  will  use  either
       the  default-sample-rate value or this alternate value, typically 44.1 or 48kHz. Switching
       between default and alternate values is enabled only when the sinks/sources are suspended.
       This  option  is ignored in passthrough mode where the stream rate will be used. If set to
       the same value as the default sample rate, this feature is disabled.


       Some hardware drivers require the hardware playback buffer to be subdivided  into  several
       fragments. It is possible to change these buffer metrics for machines with high scheduling
       latencies. Not all possible values that may  be  configured  here  are  available  in  all
       hardware.  The driver will find the nearest setting supported. Modern drivers that support
       timer-based scheduling ignore these options.

       default-fragments= The default number of fragments. Defaults to 4.

       default-fragment-size-msec=The duration of a single fragment. Defaults to 25ms  (i.e.  the
       total buffer is thus 100ms long).


       With  the  flat volume feature enabled, the sink HW volume is set to the same level as the
       highest volume input stream. Any other streams (with lower volumes) have  the  appropriate
       adjustment  applied in SW to bring them to the correct overall level. Sadly hardware mixer
       changes cannot be timed accurately and thus this change of volumes can sometimes cause the
       resulting  output  sound  to  be  momentarily too loud or too soft. So to ensure SW and HW
       volumes are applied concurrently without any  glitches,  their  application  needs  to  be
       synchronized.  The  sink  implementation  needs to support deferred volumes. The following
       parameters can be used to refine the process.

       enable-deferred-volume= Enable deferred volume for the sinks that support it. This feature
       is enabled by default.

       deferred-volume-safety-margin-usec=  The  amount  of time (in usec) by which the HW volume
       increases are delayed and HW volume decreases are advanced. Defaults to 8000 usec.

       deferred-volume-extra-delay-usec= The amount of time (in usec) by which HW volume  changes
       are delayed. Negative values are also allowed. Defaults to 0.


       The  PulseAudio  Developers  <pulseaudio-discuss  (at) lists (dot) freedesktop (dot) org>;
       PulseAudio is available from


       pulse-client.conf(5),, pulseaudio(1), pacmd(1)