mpu401-uart usually found on those onboard ac97 controller
Card1.Amixer.info:
Card hw:1 'UART'/'MPU-401 UART at 0x330, irq 10'
Mixer name : ''
Components : ''
Controls : 0
Simple ctrls : 0
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https://bugs.launchpad.net/bugs/1067619
Title:
onboard sound not available - only hdmi through soundcard available
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