more ubuntu edits
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@ -9,7 +9,7 @@ title: Ubuntu Linux
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Ubuntu Linux is the most popular variety of Linux in use on desktop
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and laptop systems. It has the backing of a for-profit corporation
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(Canonical Inc.) behind it, a defined philosophy and a huge and
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worldwide user base.As a result, it is a common platform for people
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worldwide user base. As a result, it is a common platform for people
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who want to use Ardour and other tools for music creation and
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pro-audio work.
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</p>
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@ -63,10 +63,7 @@ title: Ubuntu Linux
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</dd>
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</dl>
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<h3>Problems with PulseAudio and JACK Configuration</h3>
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<h4>Problems with the interaction between PulseAudio and JACK</h4>
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<h3>Problems with the interaction between PulseAudio and JACK</h3>
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<dl>
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<dt>Background Info</dt>
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@ -136,29 +133,35 @@ title: Ubuntu Linux
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</dd>
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</dl>
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<h2>Problems with JACK configuration<h2>
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<h3>Problems with JACK configuration<h3>
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<p>
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To function as intended, JACK needs to run with access to two
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operating system facilities called "realtime scheduling" and "memory
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locking". This means that you, the user who starts JACK, must be
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allowed access to these facilities. By default, Ubuntu does create a
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user group that has this permission but ... it does not put new
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users into this group by default. Consequently, you will not have
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permission to run JACK in the way you should.
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</p>
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<dl class="faq">
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<dt>What is the problem?</dt>
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<dd>
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<p>
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To function as intended, JACK needs to run with access to two
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operating system facilities called "realtime scheduling" and "memory
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locking". This means that you, the user who starts JACK, must be
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allowed access to these facilities. By default, Ubuntu does create a
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user group that has this permission but ... it does not put new
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users into this group by default. Consequently, you will not have
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permission to run JACK in the way you should.
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</p>
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</dd>
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<dt>Symptoms</dt>
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<dd>
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<p>
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A message like "Cannot lock down memory" in the output from JACK as
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it starts up. This output may be "hidden" in the Messages window of
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QJackctrl (aka JACK Control), so you should check there.
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</p>
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</dd>
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<dt>How to fix</dt>
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<dd>
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<p>
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Run the command <code>sudo usermod -a -G
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audio <em>YOUR-LOGIN-NAME</em></code>. Then logout and login again.
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</p>
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</dd>
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</dl>
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<h5>Symptoms</h5>
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<p>
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A message like "Cannot lock down memory" in the output from JACK as
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it starts up. This output may be "hidden" in the Messages window of
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QJackctrl (aka JACK Control), so you should check there.
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</p>
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<h5>How to fix</h5>
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<p>
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Run the command <code>sudo usermod -a -G
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audio <em>YOUR-LOGIN-NAME</em></code>. Then logout and login again.
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</p>
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