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howtos:hardware:sound_problems_on_slackware [2015/01/25 19:28 (UTC)]
dugan
howtos:hardware:sound_problems_on_slackware [2018/02/15 15:15 (UTC)]
alienbob Show how syntax elements can be used to beautify the page and make maintenance easier.
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 <!-- Add your text below. We strongly advise to start with a Headline (see button bar above). --> <!-- Add your text below. We strongly advise to start with a Headline (see button bar above). -->
 <!-- Reviewed 2012-12-24 hazel --> <!-- Reviewed 2012-12-24 hazel -->
-======Sound Problems on Slackware======+<!-- Reviewed 2018-02-15 alienbob -->
  
-**Investigate the problem**+**NOTE: on my systems, my default card is 1 and default device is 0 so I will use 1,0 through out this page**
  
-1) See which kernel modules are loaded: 
  
-     lsmod | grep snd+======Sound Problems on Slackware======
  
-Use this information along with your motherboard sound chipset to verify that the correct sound drivers are loading. +**Investigate ​the problem**
- +
- +
-2) See which sound devices are detected by alsa:+
  
-     aplay -l +  - See which kernel modules are loaded: <​code>​ 
- + lsmod | grep snd 
-Most likely, alsa is loading the correct modules but setting the wrong sound device as default. +</​code>​ Use this information along with your motherboard sound chipset to verify that the correct sound drivers are loading. 
- +  - See which sound devices are detected by alsa:<​code>​ 
-3) Test sound devices to see which one(s) work: +aplay -l 
- +</​code> ​Most likely, alsa is loading the correct modules but setting the wrong sound device as default. 
-     alsamixer +  ​- ​Test sound devices to see which one(s) work:<​code>​ 
-     ​<​F6>​ +alsamixer ​0 
-     ​<select a card(s)>​ +<​F6>​ 
-     ​<adjust volumes and make sure they aren't muted> +<select a card(s)>​ 
-     ​<ESC>+<adjust volumes and make sure they aren't muted> 
 +<ESC>
            
-     aplay -D plughw:0,0 test.wav ​  ​(WHERE 0,0 is card/slot 0, device 0 and test.wav is a sound file e.g. /​usr/​share/​sounds/​alsa/​Noise.wav) +aplay -D plughw:0,0 test.wav ​  ​(WHERE 0,0 is card/slot 0, device 0 and test.wav is a sound file e.g. /​usr/​share/​sounds/​alsa/​Noise.wav) 
-     ​aplay -D plughw:0,1 test.wav +aplay -D plughw:0,1 test.wav 
-     ​aplay -D plughw:1,0 test.wav +aplay -D plughw:1,0 test.wav 
-     ​aplay -D plughw:1,1 test.wav +aplay -D plughw:1,1 test.wav 
 +</​code>​
  
 ---- ----
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     defaults.pcm.device 0     defaults.pcm.device 0
     defaults.ctl.card 1     defaults.ctl.card 1
 +
 +-or-
 +
 +    pcm.!default {
 +      type hw
 +      card 1
 +      device 0
 +      }
 +    ctl.!default {
 +      type hw
 +      card 1
 +      }
 +
  
  
 OR, if you just want the changes for a single user create ~/.asoundrc in the user's home directory and put the above in it... OR, if you just want the changes for a single user create ~/.asoundrc in the user's home directory and put the above in it...
  
 +-----
  
 +**PROBLEM:​** Volume is low even with all controls at max.
  
 +**FIX:** Enable the alsa pre-amp.
  
 +1) Edit/Create /​etc/​asound.conf and add
 +    pcm.!default {
 +       type plug
 +       ​slave.pcm "​softvol"​
 +       }
 +       
 +    pcm.softvol {
 +       type softvol
 +       slave {
 +          pcm "​dmix:​1,​0"​
 +          }
 +       ​control {
 +          name "​Pre-Amp"​
 +          card 1
 +          }
 +       ​min_dB -5.0
 +       ​max_dB 20.0
 +       ​resolution 6
 +       }
 +**WHERE: "​dmix:​1,​0"​ is  card 1 and device 0**
 +
 +2) Reboot
 +
 +3) After you reboot a PREAMP control is supposed to appear in your mixer controls but, it doesn'​t due to a quirk. To get it to appear, open and close a media player (mplayer, dragon player or etc.). ​ After you do this, it should appear in the mixer (you may have to SELECT CONTROLS to see it).  When you reboot, it will disappear again until you open a media player. ​ To make it '​stick',​ set your alsa volumes to where you want and run "​alsactl store"​. ​ The PREAMP controls should appear normally after that.
 +
 +-----
 +
 +**PROBLEM:​** No equalizer.
 +
 +**FIX:** Enable the equalizer \\ <​note>​the ''​alsaequal''​ plugin is not part of Slackware. You can build it from source using [[https://​slackbuilds.org/​result/?​search=alsaequal&​sv=|slackbuilds.org]]</​note>​
 +
 +Output can either be from the audio device or the mixer. For the device use the following:
 +
 +1) Edit/Create /​etc/​asound.conf and add
 +   ​ctl.equal {
 +      type equal;
 +      }
 +      pcm.plugequal {
 +        type equal;
 +        slave.pcm "​plughw:​1,​0";​
 +        }
 +      pcm.!default {
 +        type plug;
 +        slave.pcm plugequal;
 +        }
 + 
 +**WHERE: "​plughw:​1,​0"​ is card 1 and device 0 - modify this for a different card or device (default is 0,0 and does not have to be entered) **
 +
 +Should you wish to play from more than one application simultaneously via the mixer (dmix), use the below:
 +
 +   ​ctl.equal {
 +      type equal;
 +      }
 +      pcm.plugequal {
 +        type equal;
 +        slave.pcm "​plug:​dmix";​
 +        }
 +      pcm.!default {
 +        type plug;
 +        slave.pcm plugequal;
 +        }
 +
 +
 +To access the equalizer, run "​alsamixer -D equal"
 ====== Sources ====== ====== Sources ======
 +AlienBOB'​s webpages and ALOT of Googling.
 +
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