It seemed that none solution from posts were working for me.
After everything fails, any solution is good, right?
So i did this ( and worked ):
- I plugged back my notebook to the HDMI connection from my turned on tv;
At this moment, i arranged to make the display to show on the tv ( like everytime when i want to watch a movie from the pc in my tv );
- Then, i played a music.
- The sound came from the tv;
- Opened the sound settings;
- Changed configurations so that the music came from the notebook again;
- unplugged the HDMI cable from the notebook;
And now i am hearing musics back from my notebook again!
footnote: this is no fancy solution and i wish i had one, but it worked right. Now every time when i watch a movie from the notebook through the tv, i will re-adjust the sound configuration to playback from the notebook before i unplug the HDMI cable from it.