Comment 0 for bug 1457369

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