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<?xml version="1.0" encoding="utf-8"?>
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<page xmlns="http://projectmallard.org/1.0/" type="topic" style="problem" id="sound-nosound" xml:lang="ja">
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<link type="guide" xref="sound-broken"/>
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<desc>Check that it's not muted, that cables are plugged in properly, and
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that the sound card is detected.</desc>
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<revision pkgversion="3.4.0" date="2012-02-19" status="outdated"/>
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<credit type="author">
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<name>GNOME ドキュメンテーションプロジェクト</name>
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<email>gnome-doc-list@gnome.org</email>
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<include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>松澤 二郎</mal:name>
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<mal:email>jmatsuzawa@src.gnome.org</mal:email>
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<mal:years>2011, 2012</mal:years>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>赤星 柔充</mal:name>
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<mal:email>yasumichi@vinelinux.org</mal:email>
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<mal:years>2011, 2012</mal:years>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>日本GNOMEユーザー会</mal:name>
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<mal:email>http://www.gnome.gr.jp/</mal:email>
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<mal:years>2011, 2012</mal:years>
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<title>I can't hear any sounds on the computer</title>
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<p>If you can't hear any sounds on your computer, for example when you try to
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play music, try these troubleshooting steps to see if you can fix the problem.</p>
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<title>Make sure that the sound is not muted</title>
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<p>Click the sound icon on the top bar (it looks like a speaker) and make sure
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that the sound is not muted or turned right down.</p>
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<p>Some laptops have mute switches or keys on their keyboards—try pressing
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that key to see if it unmutes the sound.</p>
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<p>You should also check that you haven't muted the application that you're
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using to play sound (e.g. your music player or movie player). The application
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may have a mute or volume button in its main window, so check that. Also, click
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the sound icon on the top bar and choose <gui>Sound Settings</gui>. When the
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<gui>Sound</gui> window appears, go to the <gui>Applications</gui> tab and
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check that your application is not muted.</p>
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<section id="speakers">
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<title>Check that the speakers are turned on and connected properly</title>
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<p>If your computer has external speakers, make sure that they are turned on
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and that the volume is turned up. Make sure that the speaker cable is securely
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plugged into the "output" audio socket on the back of the computer. This socket
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is usually light green in color.</p>
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<p>Some sound cards are able to switch which socket they use for output (to the
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speakers) and input (from a microphone, for instance). The output socket may be
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different when running Linux than on Windows or Mac OS. Try connecting the
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speaker cable to the different audio sockets on the computer in turn to see if
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<p>A final thing to check is that the audio cable is securely plugged into the
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back of the speakers. Some speakers have more than one input too.</p>
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<title>Check that the right sound device is selected</title>
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<p>Some computers have multiple "sound devices" installed. Some of these are
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capable of outputting sound and some are not, so you should check that you have
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the correct one selected. This might involve some trial-and-error to choose the
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<p>Click the sound icon on the top bar and select <gui>Sound Settings</gui>.</p>
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<p>In the <gui>Sound</gui> window that appears, go to the <gui>Hardware</gui>
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tab. Make a note of which device and which profile are selected (so you can
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return to the default selections if changing them doesn't work).</p>
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<p>For the selected device, try changing the profile—play a sound after you
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change the profile to see if it works. You might need to go through the list
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and try each profile.</p>
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<p>If that doesn't work, you might want to try doing the same for any other
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devices that are listed.</p>
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<p>Try changing the <gui>Connector</gui> option in the <gui>Output</gui> tab.</p>
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<section id="hardware-detected">
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<title>Check that the sound card was detected properly</title>
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<p>Your sound card may not have been detected properly. If this has happened,
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your computer will think that it isn't able to play sound. A possible reason
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for the card not being detected properly is that the drivers for the card are
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<p>Go to the <gui>Activities</gui> overview and open a Terminal.</p>
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<p>Type <cmd>aplay -l</cmd> and press <key>Enter</key>.</p>
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<p>A list of devices will be shown. If there are no <gui>playback hardware
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devices</gui>, your sound card has not been detected.</p>
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<p>If your sound card is not detected, you may need to manually install the
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drivers for it. How you do this will depend on the card you have.</p>
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<p>You can see what sound card you have by using the <cmd>lspci</cmd> command
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in the Terminal. You may have to run <cmd>lspci</cmd> as
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<link xref="user-admin-explain">superuser</link>; either type <cmd>sudo lspci</cmd>
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and type your password, or type <cmd>su</cmd>, enter the <em>root</em>
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(administrative) password, then type <cmd>lspci</cmd>. See if an
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<em>audio controller</em> or <em>audio device</em> is listed—it should have the
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sound card's make and model number. <cmd>lspci -v</cmd> will show a list with
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more detailed information.</p>
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<p>You may be able to find and install drivers for your card. It's best to ask
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on support forums (or otherwise) for your Linux distribution for instructions.</p>
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<p>If you can't get drivers for your sound card, you might prefer to buy a new
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sound card. You can get sound cards that can be installed inside the computer
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and external USB sound cards.</p>
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