Default [Q] Audio normal earspeaker on GT-I9001 not adjustable after Android 4.2.2

hi
After installing the (perfect) Android 4.2.2 (Kernel 3.4.74 CyanogenMod 10.1-201312150) on my Galaxy S plus i cannot adjust the very weak audio level of the normal earspeaker (used for normal phone calls)

I tried almost anything to solve the problem. Till now no solution, i can only make phonecalls on the external speaker or in a Isolated room

Can anyone help