From Open Sound System
Revision as of 02:13, 28 August 2008 by Cesium (Add multichannel question/answer)
This page provide general troubleshooting tips. If these cannot help to solve a problem with OSS, you may wish to consult the 4front support forum.
- Always read your driver's manpage. You can get the name of driver from 'ossinfo'.
- Always test with osstest.
- When consulting the forum, attach the output of 'ossinfo -v3' and 'ossmix'.
How do I...
- Change mixer settings - ossmix (command line), ossxmix (GUI)
- Start and shut down OSS - soundon, soundoff (both require root)
- Save and restore mixer settings - savemixer (saving requires write permissions for mixer.save, or using '-f' switch to use another file)
- Build OSS from source
- Record and play sound - ossrecord, ossplay (though you should probably use more dedicated software like Audacity)
- Other Tips And Tricks
I can't hear any sound!
- Did OSS load at all?
- Does osstest work?
- Are the outputs muted in the mixer?
- Is the default output (the one linked to /dev/dsp) the one connected / outputting sound in osstest? If not, see here how to change that.
- HDAudio: Are the jacks detected by OSS as output, actually the jacks connected to the speaker?
- Ich: Setting ac97_amplifier to 0 in $OSSLIBDIR/conf/osscore.conf helped on a Gateway 4542GP notebook.
- $OSSLIBDIR is typically /usr/lib/oss, and can be determined exactly by the contents of /etc/oss.conf.
- Is this an hardware issue?
- Are the speakers muted?
- Is the soundcard connected correctly to the speakers?
- Do other drivers available for your OS (e.g. ALSA for Linux, FreeBSD native) work?
I hear noises!
- Many soundcards' hardware requires output mixers be set to less than maximum (60% at times).
- Set vmix0-src to an higher setting.
- Is the cable from the soundcard to the speakers connected correctly? Could it be too long?
- Build and use OSS using the source from the public hg repository, perhaps a newer version will work better.
I can't get multiple sound clients to play on the same device!
- multiple clients to same device node aren't supported on 4front's OSS for FreeBSD. It instead splits the mixing to separate devices: /dev/dsp1, /dev/dsp2, etc. Either set programs to use separate devices, or use a sound server like aRts, esd, etc.
- Is vmix loaded?
- If yes, Is vmix attached to the default output device? (Check if 'ossinfo -v3' shows more than one engine for the default output device).
- In OSS 4.0, (Doesn't apply to build 1016:) If vmix is not attached, make sure vmix1_masterdev in $OSSLIBDIR/conf/vmix.conf is set to the output device's device index (this can be determined via 'ossinfo -a'). ($OSSLIBDIR is typically /usr/lib/oss).
- In OSS 4.1, 'vmixctl' command is used instead of vmix.conf.
- is vmix unmuted?
I can't get multichannel/5.1 output to play!
- Some configurations require more than one cable connected to the speaker set. Make sure that as many cables as required are connected.
- Some devices have the multich output at a different device node than the regular one, use /dev/dsp_multich rather than /dev/dsp as /dev/dsp_multich is always linked to the correct device.
- Some devices require changing settings in the mixer (e.g. by 'ossmix' or 'ossxmix') to work.
- sblive/audigy devices may require use of the sblive_digital_din (or audigy_digital_din) option in the device configuration file - see driver manpage.
- In OSS 4.0, (Doesn't apply to build 1016:) Set vmix1_multich=1 in $OSSLIBDIR/conf/vmix.conf ($OSSLIBDIR is typically /usr/lib/oss).
- In 4.1, set vmix0-channels to "Multich" in the mixer.