UbuntuHelp:SoundTroubleshootingProcedure

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Sound troubleshooting procedure to be followed while creating a new question at https://answers.launchpad.net/ubuntu/+addquestion

The Procedure

In order to gather essential troubleshooting information about your sound card, please follow this procedure:

Step 1

Please try upgrading the ALSA sound system to the newest version, then reboot and retest sound. If you are using Ubuntu 9.10 (Karmic Koala edition) or older versions, please use this link

Step 2

Open | Terminal console to get to the command-line

Step 3

Please make sure you have rebooted your computer at least once. Then proceed with running the following 2 commands - copy&paste (with the mouse) each command onto the Terminal and then hit <enter> after each command.

wget -O alsa-info.sh http://212.20.107.51/alsa-info.sh

bash alsa-info.sh --pastebin

When the alsa-info.sh script asks "Automatically upload ALSA information to pastebin? [y/N]" type y and then hit <enter> to make sure the script actually runs and uploads to pastebin. Please post the full terminal output after the script has actually run by creating a new question in launchpad then please copy&paste the terminal output into your newly created question. Carefully inspect the contents of the ALSA Information script at the <your number is here> Pastebin website location that was generated by the previous command

bash alsa-info.sh --pastebin

After upgrading ALSA and rebooting the computer please make sure that the ALSA driver version, library version and utilities version are all exactly the same version number. The file at the <your number is here> Pastebin website location should contain something like this:

ALSA Version
Driver version: 1.0.21
Library version: 1.0.21a
Utilities version: 1.0.21

If the Driver, Library and Utilities version numbers are not equal then - in most cases - this is caused by one of the following issues: 1. One of the ALSA components was not successfully upgraded during step 1 in this procedure 2. ALSA was correctly installed or upgraded, but a wrong / old kernel was booted instead of the most recent kernel version. In that case, boot the newest kernel version and then retest sound.

For example: if you installed or upgraded to Ubuntu 9.10 (Karmic Koala edition), make sure the running kernel version is 2.6.31-14-generic or higher. Or else sound will not work!

Step 4

Please copy&paste the following command into the Linux Terminal. Please do not copy&paste this command from an email message into the Terminal, as that will only copy part of the command. The command starts with the command cat and ends with the filter snd. So, please copy&paste the entire command below into a Terminal. Press enter. Then type your normal user password when asked, no stars are given as you type. Then press enter again.

cat /proc/asound/cards; sudo aptitude install paman gnome-alsamixer alsa-utils flashplugin-nonfree-extrasound; aplay -l;  sudo lshw -C sound;  ls -lart /dev/snd;  cat /dev/sndstat; lspci -nn;  sudo which alsactl; sudo fuser -v /dev/dsp /dev/snd/* ; dpkg -S bin/slmodemd;  lsmod | grep snd

Step 5

Please post results (copy&paste terminal output) in the new thread that you created at Launchpad Answers Forum.

Step 6

Run the following command in a Terminal:

pavucontrol

In this application - PulseAudio Volume Control - switch to the "Playback" tab and increase System sounds volume to 100%

Step 7

Run the following command in a Terminal:

gnome-alsamixer

In this application, make sure to set all channels to high volume levels. Make sure the different speakers (especially 'Front', 'Master', and 'PCM") are NOT muted and NOT set to low volume levels in gnome-alsamixer. On some Toshiba laptop models (T40, T43p, ... R51e ...), the audio is muted, if either Headphone or Line Jack are NOT muted in alsamixer. See also ALSA Wiki FAQ [1]. Also, if Headphone Sense or Line Jack Sense are unmuted, audio is dead (R52, X40). By default the Sense settings are not shown in GNOME. A channel is muted in alsamixer, if there is an "MM" under that specific channel/volume bar. On some Toshiba laptop models, setting the PCM channel volume higher than 70% in alsamixer, may result in clipping (for example: very "harsh" and distorted sound both on the internal speakers and on headphones plug), regardless of the Master channel. Problem with audio clipping HP Laptops in the dv5, dv6, dv7 series and some HP Mini netbook computers have a strange problem in Ubuntu. When you plug in the headphones, you will hear sound via the headphones and speakers at the same time. The following link should provide a workaround for that issue: Problem with headphones

Step 8

Please also report if you cannot hear sound through the speakers, the headphones or cannot hear sound on both.

Step 9

If you are using a dual boot system (even with Windows and Ubuntu installed on separate partitions), then make sure to set the sound volume in Windows to a high level before booting into Ubuntu. Also make sure to use the special function keys in Windows to make sure the loudspeakers are physically switched ON and working properly in Windows before installing and testing Ubuntu. This step is necessary with certain Toshiba Tecra laptops.

Step 10

In System/Administration/Users and Groups, make sure that your normal user and the root user are members of the following 5 groups: pulse pulse-access pulse-rt audio video

Step 11

Run the command gnome-volume-control and set the Sound Theme to "No sounds". The Sound Theme tool is also accessible via System > Preferences > Sound

Step 12

Try connecting headphones to different audio jacks/ports on the back-panel of the sound-card until you hopefully hear sound

Step 13

If you happen to have two sound-cards installed in your pc, one integrated into the motherboard - for example: an hda-intel audiochip - and one inserted into a PCI slot, then try removing the PCI audio card, reboot your pc and retest sound using only the motherboard's on-board audio chip. If you absolutely need to get the PCI audio card working, try disabling the motherboard's on-board audio chip via the BIOS. Then retest sound in Ubuntu.

Step 14

Please also specify the exact model and make of your PC (if possible) in the new thread that you created at Launchpad Answers Forum.

Other Pages

For some initial suggestions please also read the following pages

!!! Check for correct /etc/modprobe.d/alsa-base.conf options on the following pages:

How to install an alternative audio system called OSS4 (instead of ALSA)

If you want to use OSS4 instead of ALSA, first follow all the steps here: | OSS4 guide and then follow all the steps here: OSS info

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