The problem I encountered is that when I press the volume button, it is not the media volume but the call volume. When listening to music and watching videos, I can only hear a little sound when the volume is turned to the maximum. And when listening to music, When adjusting the music volume, the media volume does not move and is out of sync. I have been trying various solutions and tried the suggestions from netizens but they did not solve my problem.

Finally, I found out that the problem was caused by the "Xuetong" software I use in class every day! I turned my phone off and on again. The first time I turned it on, I adjusted the volume. When the media volume appeared, I thought the problem was solved, so I turned on NetEase Cloud Music to listen to music. I could still hear a loud sound even when the volume was turned to the minimum. There was no problem when I turned on QQ Voice and I could hear the normal volume. When I turned on "Xuetong", the music playing in the background suddenly stopped. I looked back at the music and it was not turned off. The display was still playing. I was just listening. There was no sound. I tried to adjust the volume button, but the call volume appeared again, and the media volume was adjusted to the maximum and the sound was very small, so I concluded: Do not open "Xuetong" while the music software is playing music and the video software is playing videos. This software