[REGRESSION] i915: No HDMI output with 4.4

[Alessandro Capogna]

Hi everybody! I have exactly the same problem as Oleksandr (upgrading from
kernel 4.1.16 to 4.4.6, but also 4.4.8 and 4.5.3 are affected)

This is my environment info:

# uname -a
Linux 4.4.6-gentoo #2 SMP Fri Apr 29 01:42:29 CEST 2016 x86_64 Intel(R)
Core(TM) i5-3470 CPU @ 3.20GHz GenuineIntel GNU/Linux

# lscpu | grep "Model name"
Model name:            Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz

# lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd
Gen Core processor Graphics Controller (rev 09)

# xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x49 cap: 0xb, Source Output, Sink Output, Sink Offload
crtcs: 4 outputs: 6 associated providers: 0 name:Intel

# xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 connected (normal left inverted right x axis y axis)
   1024x768      60.00
   800x600       60.32    56.25
   848x480       60.00
   640x480       59.94
HDMI2 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 531mm x 299mm
   1920x1080     60.00*+  50.00    50.00    50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.88
   1280x1024     60.02
   1440x900      59.90
   1280x800      59.91
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      70.07    60.00
   800x600       60.32    56.25
   720x576       50.00
   720x576i      50.00
   720x480       60.00    59.94
   720x480i      60.00    59.94
   640x480       66.67    60.00    59.94
   720x400       70.08
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

I use the motherboard's built in hdmi connector to connect through hdmi
cable to an Acer G245H

Sorry for the late "contribute" but i just upgrade.

Can i send other helpful info?

Thanks!!!
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