Headphone Playback not Working

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http://superuser.com – I am using an Acer S7-191 with Windows 8.1, I had the system reinstalled with the same Windows version after an windows update crashed the system. The problem is I cannot plug headphone to playback. In playback devices, there are only Speaker and Digital Audio HDMI even after I chose to display all disconnected and disabled device. Here are what I have tried: Install all recommended driver on Acer's webste Install and reinstall Realtek software and driver Update driver in device manager Disable front panel jack detection in Realtek software provided y Acer (after that no "2nd Output" tab a (HowTos)