Check that it's not muted, that cables are plugged in properly, and that the sound card is detected.
GNOME ドキュメンテーションプロジェクト
gnome-doc-list@gnome.org
松澤 二郎
jmatsuzawa@gnome.org 2011, 2012
赤星 柔充
yasumichi@vinelinux.org 2011, 2012
Kentaro KAZUHAMA
kazken3@gmail.com 2012
Shushi Kurose
md81bird@hitaki.net 2012
日本GNOMEユーザー会
http://www.gnome.gr.jp/ 2011, 2012

# I can't hear any sounds on the computer

If you can't hear any sounds on your computer, for example when you try to play music, try these troubleshooting steps to see if you can fix the problem.

# Make sure that the sound is not muted

Click the sound icon on the top bar (it looks like a speaker) and make sure that the sound is not muted or turned right down.

Some laptops have mute switches or keys on their keyboards—try pressing that key to see if it unmutes the sound.

You should also check that you haven't muted the application that you're using to play sound (e.g. your music player or movie player). The application may have a mute or volume button in its main window, so check that. Also, click the sound icon on the top bar and choose Sound Settings. When the Sound window appears, go to the Applications tab and check that your application is not muted.

# Check that the speakers are turned on and connected properly

If your computer has external speakers, make sure that they are turned on and that the volume is turned up. Make sure that the speaker cable is securely plugged into the "output" audio socket on the back of the computer. This socket is usually light green in color.

Some sound cards are able to switch which socket they use for output (to the speakers) and input (from a microphone, for instance). The output socket may be different when running Linux than on Windows or Mac OS. Try connecting the speaker cable to the different audio sockets on the computer in turn to see if that works.

A final thing to check is that the audio cable is securely plugged into the back of the speakers. Some speakers have more than one input too.

# Check that the right sound device is selected

Some computers have multiple "sound devices" installed. Some of these are capable of outputting sound and some are not, so you should check that you have the correct one selected. This might involve some trial-and-error to choose the right one.

Click the sound icon on the top bar and select Sound Settings.

In the Sound window that appears, go to the Output tab. Make a note of which device and which profile are selected (so you can return to the default selections if changing them doesn't work).

For the selected device, try changing the profile—play a sound after you change the profile to see if it works. You might need to go through the list and try each profile.

If that doesn't work, you might want to try doing the same for any other devices that are listed.

Try changing the Connector option in the Output tab.

# Check that the sound card was detected properly

Your sound card may not have been detected properly. If this has happened, your computer will think that it isn't able to play sound. A possible reason for the card not being detected properly is that the drivers for the card are not installed.

Go to the Activities overview and open a Terminal.

Type aplay -l and press Enter.

A list of devices will be shown. If there are no playback hardware devices, your sound card has not been detected.

If your sound card is not detected, you may need to manually install the drivers for it. How you do this will depend on the card you have.

You can see what sound card you have by using the lspci command in the Terminal. You may have to run lspci as superuser; either type sudo lspci and type your password, or type su, enter the root (administrative) password, then type lspci. See if an audio controller or audio device is listed—it should have the sound card's make and model number. lspci -v will show a list with more detailed information.

You may be able to find and install drivers for your card. It's best to ask on support forums (or otherwise) for your Linux distribution for instructions.

If you can't get drivers for your sound card, you might prefer to buy a new sound card. You can get sound cards that can be installed inside the computer and external USB sound cards.