Difference between revisions of "Sound"

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See
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Linux sound is one big mess. We have ALSA, OSS, PulseAudio, gstreamer, arts, phonon as subsystems. This article explains the concepts and helps people fixing their sound problems.
* [[Sound troubleshooting]]
 
  
http://www.linuxjournal.com/article/6735
+
The "normal" Linux sound system is [http://en.wikipedia.org/wiki/Advanced_Linux_Sound_Architecture ALSA]. It emulates the older [http://en.wikipedia.org/wiki/Open_Sound_System OSS]. ALSA allows several applications to play sound at the same time, OSS does not. This is because OSS provides a single sound device file, /dev/dsp that applications lock when outputting to it. To raise confusion, ALSA emulates OSS by also providing /dev/dsp.
  
Soundcard Intel 82801G on Ubuntu 8.10: recording problems
+
The first step to find out if your sound is configured correctly is to output noise. Turn the volume low and try
* recording via external microphone very quiet
+
speaker-test
* recording via internal microphone cannot be heard
+
If you hear your voice, your microphone and drivers are okay.
  
alsamixer -c 0
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= See also =
 
+
* [[Sound troubleshooting]]
tstaerk@dell-desktop:~/alsa$ modprobe -l | grep snd-hda
+
* http://www.linuxjournal.com/article/6735
/lib/modules/2.6.27-14-generic/kernel/sound/pci/hda/snd-hda-intel.ko
 
tstaerk@dell-desktop:~/alsa$ md5sum /lib/modules/2.6.27-14-generic/kernel/sound/pci/hda/snd-hda-intel.ko
 
bec085930fe6b6e7c448c5ba7d3e50fa  /lib/modules/2.6.27-14-generic/kernel/sound/pci/hda/snd-hda-intel.ko
 
tstaerk@dell-desktop:~/alsa$ ll /lib/modules/2.6.27-14-generic/kernel/sound/pci/hda/snd-hda-intel.ko
 
bash: ll: command not found
 
tstaerk@dell-desktop:~/alsa$ ls -l /lib/modules/2.6.27-14-generic/kernel/sound/pci/hda/snd-hda-intel.ko
 
-rw-r--r-- 1 root root 511592 2009-07-25 01:48 /lib/modules/2.6.27-14-generic/kernel/sound/pci/hda/snd-hda-intel.ko
 
 
  modinfo snd-hda-intel
 
filename:      /lib/modules/2.6.27-14-generic/kernel/sound/pci/hda/snd-hda-intel.ko
 
description:    Intel HDA driver
 
license:        GPL
 
srcversion:    C4633ED01D74A5D02607392
 
alias:          pci:v00006549d00001200sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000BD7sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000BD6sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000BD5sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000BD4sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000AC3sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000AC2sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000AC1sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000AC0sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd000007FDsv*sd*bc*sc*i*
 
alias:          pci:v000010DEd000007FCsv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000777sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000776sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000775sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000774sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd0000055Dsv*sd*bc*sc*i*
 
alias:          pci:v000010DEd0000055Csv*sd*bc*sc*i*
 
alias:          pci:v000010DEd0000044Bsv*sd*bc*sc*i*
 
alias:          pci:v000010DEd0000044Asv*sd*bc*sc*i*
 
alias:          pci:v000010DEd000003F0sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd000003E4sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd00000371sv*sd*bc*sc*i*
 
alias:          pci:v000010DEd0000026Csv*sd*bc*sc*i*
 
alias:          pci:v000010B9d00005461sv*sd*bc*sc*i*
 
alias:          pci:v00001039d00007502sv*sd*bc*sc*i*
 
alias:          pci:v00001106d00003288sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA48sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA40sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA38sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA30sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA28sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA20sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA18sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA10sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA08sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000AA00sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000970Fsv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000960Fsv*sd*bc*sc*i*
 
alias:          pci:v00001002d00007919sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000793Bsv*sd*bc*sc*i*
 
alias:          pci:v00001002d00004383sv*sd*bc*sc*i*
 
alias:          pci:v00001002d0000437Bsv*sd*bc*sc*i*
 
alias:          pci:v00008086d0000811Bsv*sd*bc*sc*i*
 
alias:          pci:v00008086d00003B56sv*sd*bc*sc*i*
 
alias:          pci:v00008086d00003A6Esv*sd*bc*sc*i*
 
alias:          pci:v00008086d00003A3Esv*sd*bc*sc*i*
 
alias:          pci:v00008086d0000293Fsv*sd*bc*sc*i*
 
alias:          pci:v00008086d0000293Esv*sd*bc*sc*i*
 
alias:          pci:v00008086d00002911sv*sd*bc*sc*i*
 
alias:          pci:v00008086d0000284Bsv*sd*bc*sc*i*
 
alias:          pci:v00008086d0000269Asv*sd*bc*sc*i*
 
alias:          pci:v00008086d000027D8sv*sd*bc*sc*i*
 
alias:          pci:v00008086d00002668sv*sd*bc*sc*i*
 
depends:        snd-pcm,snd-page-alloc,snd
 
vermagic:      2.6.27-14-generic SMP mod_unload modversions 586
 
parm:          power_save:Automatic power-saving timeout (in second, 0 = disable). (int)
 
parm:          index:Index value for Intel HD audio interface. (array of int)
 
parm:          id:ID string for Intel HD audio interface. (array of charp)
 
parm:          enable:Enable Intel HD audio interface. (array of bool)
 
parm:          model:Use the given board model. (array of charp)
 
parm:          position_fix:Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF). (array of int)
 
parm:          bdl_pos_adj:BDL position adjustment offset. (array of int)
 
parm:          probe_mask:Bitmask to probe codecs (default = -1). (array of int)
 
parm:          single_cmd:Use single command to communicate with codecs (for debugging only). (bool)
 
parm:          enable_msi:Enable Message Signaled Interrupt (MSI) (int)
 
parm:          power_save_controller:Reset controller in power save mode. (bool)
 

Latest revision as of 10:17, 7 December 2014

Linux sound is one big mess. We have ALSA, OSS, PulseAudio, gstreamer, arts, phonon as subsystems. This article explains the concepts and helps people fixing their sound problems.

The "normal" Linux sound system is ALSA. It emulates the older OSS. ALSA allows several applications to play sound at the same time, OSS does not. This is because OSS provides a single sound device file, /dev/dsp that applications lock when outputting to it. To raise confusion, ALSA emulates OSS by also providing /dev/dsp.

The first step to find out if your sound is configured correctly is to output noise. Turn the volume low and try

speaker-test

If you hear your voice, your microphone and drivers are okay.

See also