i915, HDMI/DP audio with multiple monitors

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Hi,

I have a system with multiple monitors and would like to send
notification sounds to the monitor on which corresponding
window is visible.

For a workstation and a tiny computer things look different:
- workstation (Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz):
 00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06)
 00:03.0 Audio device [0403]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller [8086:0c0c] (rev 06)
 00:1b.0 Audio device [0403]: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller [8086:8c20] (rev 04)

 Here alsa show me two cards:
 - HDA Intel PCH (Realtek ALC671)
 - HDA Intel HDMI (Intel Generic)

 **** List of PLAYBACK Hardware Devices ****
 card 0: HDMI [HDA Intel HDMI], device 3: Generic Digital [Generic Digital]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 card 1: PCH [HDA Intel PCH], device 0: ALC671 Analog [ALC671 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0


- tiny computer (Intel(R) Core(TM) i5-6500T CPU @ 2.50GHz):
 00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530 [8086:1912] (rev 06)
 00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-H HD Audio [8086:a170] (rev 31)

 Here alsa shows a single card:
 - HDA Intel PCH (Realtek ALC671)

 **** List of PLAYBACK Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: ALC671 Analog [ALC671 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 card 0: PCH [HDA Intel PCH], device 3: Generic Digital [Generic Digital]
   Subdevices: 1/1
   Subdevice #0: subdevice #0


How can I determine/set to which monitor the sound should go, and preferably send
different sounds to both monitors at same time?


Cheers,
Bruno
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