[Q] Front side speaker in YU yureka topic

Front side speaker is not working when I call or attend calls.. When I activate loudspeaker then I can hear and talk.. Problem is front speaker(near front cam) is not working.. Is there any settings should I do or it is hardware problem or software problem?
Another thing is in about phone.. It shows me about ARM v7 processor rev 1 (v7l) what is this type processor? Anybody can you please upload screenshot about phone of their YU yureka.