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[Bug 1457369] [NEW] kernel 3.19.0-18 breaks HDMI audio for snd_hda_intel


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Problem appears on multiple computers with exact same kernel update, so clearly the problem is within the kernel. 3.19.0-16 did work without any problems.
Before sound worked great via HDMI, now the HDMI output is not visible in neither alsamixer nor pulseaudio. Audio via the headphone jack still works.
The computers are Intel-NUC-Kit-D54250WYK:
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a26] (rev 09)
	Subsystem: Intel Corporation Device [8086:2054]
	Kernel driver in use: i915
00:03.0 Audio device [0403]: Intel Corporation Haswell-ULT HD Audio Controller [8086:0a0c] (rev 09)
	Subsystem: Intel Corporation Device [8086:2054]
	Kernel driver in use: snd_hda_inte

dmesg gives:
[    3.178745] sound hdaudioC1D0: autoconfig: line_outs=1 (0x21/0x0/0x0/0x0/0x0) type:hp
[    3.178750] sound hdaudioC1D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    3.178753] sound hdaudioC1D0:    hp_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    3.178754] sound hdaudioC1D0:    mono: mono_out=0x0
[    3.178756] sound hdaudioC1D0:    inputs:
[    3.178759] sound hdaudioC1D0:      Mic=0x19
[    3.215371] snd_hda_intel 0000:00:03.0: Cannot turn on display power on i915
[    3.297561] [drm] Initialized i915 1.6.0 20141121 for 0000:00:02.0 on minor 0
[    3.304357] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    3.304360] i915 0000:00:02.0: registered panic notifier
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
 /dev/snd/controlC1:  maarten    1669 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 15.04
 Bus 001 Device 008: ID 8087:07dc Intel Corp. 
 Bus 001 Device 007: ID 046d:c52b Logitech, Inc. Unifying Receiver
 Bus 001 Device 002: ID 8087:8000 Intel Corp. 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=6c65d9ee-31fe-4832-8907-f47ac02d6f83 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
 linux-restricted-modules-3.19.0-18-generic N/A
 linux-backports-modules-3.19.0-18-generic  N/A
 linux-firmware                             1.143.1
Tags:  vivid
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 3.19.0-18-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip fuse lp lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 04/10/2015
dmi.bios.vendor: Intel Corp.
dmi.bios.version: WYLPT10H.86A.0038.2015.0410.1634
dmi.board.name: D54250WYK
dmi.board.vendor: Intel Corporation
dmi.board.version: H13922-302
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorp.:bvrWYLPT10H.86A.0038.2015.0410.1634:bd04/10/2015:svn:pn:pvr:rvnIntelCorporation:rnD54250WYK:rvrH13922-302:cvn:ct3:cvr:

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Tags: apport-collected vivid
kernel 3.19.0-18 breaks HDMI audio for snd_hda_intel
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