Written for people googlinig thnis problem.
For sony xperia acro s lt26w firmware 6.2.B.0.200
Outline Howto fix this issue https://code.google.com/p/android/issues/detail?id=36026
Root your phone: google for "easy root doomlord"
Install on lt26w "Root ftp server" and run it (this will help making /system writeable)
edit the file on lt26w /system/usr/keylayout/simple_remote.kl
Change this
key 256 HEADSETHOOK WAKE
Into This
key 256 MEDIA_NEXT WAKE
reboot phone
