This question already has an answer here:
As I run programs in
wine-1.6.2 my screen speakers will be used as default. The default, as changed via
alsamixer, is to disable the screen speakers and allow all other sound to flow freely (auto mute: disabled). I have no idea why this happens.
I run Ubuntu 14.04 64-bit. I have no special sound drivers installed. I don't really know how to troubleshoot this issue so I don't have any further information.