I'm having some trouble with low volume when calling. The problem is that the phone speaker is very low and if there is some noise where I'm at (shopping mall, city center,...) I usually can't hear the person on the other side. I've tried Viper4android and many different roms. I've always had this trouble even with stock rom. I found that there is a solution for Galaxy S3 running CM http://forum.xda-developers.com/show....php?t=2400231 .
I am also running CM 11 on my Xperia P so I was wondering if there is a simmilar solution?