No default HDMI/DP audio sink

Like' al the hardware works, but when I'm starting up the PC, there're no audio devices detected, but for example, aplay shows this:
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Generic [HD-Audio Generic], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

The first one being the port I'm using (the second for what I know is a dummy 'cus the card has only one output) and running this command:
pactl load-module module-alsa-sink device=hw:0,3 sink_name="HDMI Sink"
Effectively enables the audio and it works properly. So my issue is, shouln't the OS handle this by itself instead of I having to run this command every time I start the computer?
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