Can confirm this bug. Sound via HDMI worked in 14.04 and 14.10 but not
in 15.04. Pavucontrol shows in the configuration tab a long list of HDMI
outputs claiming all are "unplugged" (compare attached screenshot).
Previous Xubuntus only showed a single HDMI output that worked.
Output from "pacmd list-sinks | grep -E 'index:|name:' "
index: 1
name: <alsa_output.pci-0000_00_14.2.analog-stereo>
* index: 5
name: <alsa_output.pci-0000_01_00.1.hdmi-stereo>
** Attachment added: "pavucontrol_hdmi.jpg"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1447767/+attachment/4384861/+files/pavucontrol_hdmi.jpg
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https://bugs.launchpad.net/bugs/1447767
Title:
[XPS 13 9343, Intel Broadwell HDMI, Digital Out, HDMI] No sound at all
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