I have a similar problem on running Manjaro. Very muffled sound as default, just audible when set to 150% in the volume control.
Opening alsamixer as sudo, there are two sliders on the left labeled "headphone". The left one is set to zero the right one to 100dB as default. Changing the left one to 100dB and exiting alsamixer restores sound perfectly and everything works. Problem is that this change in alsamixer does not survive a reboot. I have to change this manually every time.
Any idea how I can save this change in alsamixer permanently ?
Addendum
I tried "sudo alsactrl store" but settings are not loaded on reboot. I have to manually enter "sudo alsactrl restore" to load the saved settings. How can I get alsamixer to automatically reload stored settings ?
Opening alsamixer as sudo, there are two sliders on the left labeled "headphone". The left one is set to zero the right one to 100dB as default. Changing the left one to 100dB and exiting alsamixer restores sound perfectly and everything works. Problem is that this change in alsamixer does not survive a reboot. I have to change this manually every time.
Any idea how I can save this change in alsamixer permanently ?
Addendum
I tried "sudo alsactrl store" but settings are not loaded on reboot. I have to manually enter "sudo alsactrl restore" to load the saved settings. How can I get alsamixer to automatically reload stored settings ?