Recently I installed Ubuntu 18.04 on my laptop having an SSD and an internal HDD. Soon after fixing a lot of issues, I encountered through this one and thought maybe a lot of people are going through this. So,why not write about it?
Sometimes it happens that all the audio controls and volume are full and you stilll don't hear any volume coming out of those speakers. I researched a lot and found out that there maybe a problem with the mixer control. And here is what I found out. I ran
alsamixer in terminal and checked if all the volumes are full or not.
The 'Headphone' volume was mute even though the 'Master' one was full. And this small thing was the issue. The fix? Simple use arrow keys (left/right) to highlight the headphones tab (it turns red as master is in the above photo). Then use arrow keys(up/down) to increase/decrease the volume. Exit the interface by tapping the Esc key.
You can also use the terminal commands to adjust the volume:
amixer set Headphone 50% amixer set Master 80%
This finally helped me figure out the issue with the audio. If this does not work, let's just discuss what might be happening!