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First of all I have just started using Ubuntu and I am not a real expert on coding.

Then my problem is the following my laptop recognises my HDMI-cable and when I select the HDMI as sound output it doesn’t give any sound.

I took the following screenshots to illustrate my problem:

PulseAudio Volume Control:

enter image description here

System Sound:

and the output for the command: aplay -l

**** List of PLAYBACK Hardware Devices ****

 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

 card 0: Intel [HDA Intel], device 1: STAC92xx Digital [STAC92xx Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

 card 0: Intel [HDA Intel], device 3: HDMI 0 [HDMI 0]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

I hope this is enough information.

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