So Hello EveryBody I was having this difficulty since I have changed to new macbook pro 2015. So I have upgraded to windows 10 and suddenly sound stopped working. On mac I was having the sound on windows I was having the sound from headphone. So I searched a lot and somehow I have fixed it. So here is it how to do;
I read a guy saying this to update driver :
here is the link for latest cirrus logic or something
http://www.megafileupload.com/qC2V/New_folder.rar
download and unzip to somewhere. Then go to the device manager > soun, video and game controllers > cirrus logic > right click > update driver software >
browse for driver software on your computer > let me pick from a list of device drivers on my computer > Have Disk > browse to folder you have downloaded then chose cs420x(that should be the only one) when you install it you will need to restart.
when you re-start here is whats gonna happen. There will be a problem on sound icon it will be crossed. Then again go to device manager and pick cirrus logic right click and uninstall then search for driver changes it will be installed again and restart. Then it will work.
So this worked for me after everything I tried. I hope it works for you too