the headphone of your on board have higher priority than HDMI or
USB headset
alsa.components = "USB046d:0a0b"
module-udev-detect.discovered = "1"
device.icon_name = "audio-headset-usb"
device.intended_roles = "phone"
ports:
analog-output-headphones: Headphones (priority 9000, latency
offset 0 usec, available: unknown)
properties:
device.icon_name = "audio-headphones"
active port: <analog-output-headphones>
ports:
hdmi-output-0: HDMI / DisplayPort (priority 5900, latency
offset 0 usec, available: yes)
properties:
device.icon_name = "video-display"
device.product.name = "DELL U2413"
active port: <hdmi-output-0>
ports:
analog-output-speaker: Speakers (priority 10000, latency offset
0 usec, available: no)
properties:
device.icon_name = "audio-speakers"
analog-output-headphones: Headphones (priority 9000, latency
offset 0 usec, available: yes)
properties:
device.icon_name = "audio-headphones"
active port: <analog-output-headphones>
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https://bugs.launchpad.net/bugs/1236781
Title:
USB headphones not reacting with Kubuntu 13.10
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