Comment 6 for bug 1248116

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David Henningsson (diwic) wrote : Re: PulseAudio switch rapidly port making the sound horrible

> It's an integrated audio device.

This motherboard has a "front panel HDA" connector, which is what I'm talking about here.

If you left this connector unconnected, try disabling it in BIOS. If you connected it to the chassis, check the connection.