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How To Verify HDMI Audio Out In Ubuntu Linux (And Its Derivatives)

Assuming you have installed your graphics card drivers correctly, you will still want to quickly verify your HDMI audio out is working before any further mucking about in the operating system environment. In Ubuntu 14.04, this is done quite simply from the menu bar.

Click the sound icon in the upper-right corner, then in the context menu that appears, click on “Sound Settings”

Screen Shot 2015-04-03 at 11.02.11 PM

In the Sound Settings dialog box, verify that your sound card is activated and click the “Test Sound” button.

Screen Shot 2015-04-03 at 11.02.32 PM

Click the test button for each channel and verify the output.

Screen Shot 2015-04-03 at 11.02.38 PM

Other derivatives of Ubuntu (particularly the lightweight Lubuntu) do not have the robust GUI that Ubuntu features. In these cases, a little terminal jiggery-pokery will be necessary.

Verify the HDMI audio output with this terminal command:

aplay -D plughw:0,3 /usr/share/sounds/alsa/Front_Center.wav

Use Nano (or another inline text editor) to add the following line to /etc/asound.conf AND/OR ~/.asoundrc (depending on what your distro uses)

pcm.!default = pcm.hdmi

Reboot, and you should be up and running with full HDMI stereo sound!

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