Description of problem:
When you set the Input Volume of the Microphone via Mouse to 0 and than rais it again, the volume jumps back to 0 and only reacts on the second setting

Version-Release number of selected component (if applicable):
gnome-settings-daemon-3.14.4-9.el7.x86_64

How reproducible:
every time you try to set the Input Volume on the Mic from 0 to >0

Steps to Reproduce:
1. Start Gnome Settings
2. switch to the Sound Module
3. click on Input
4. move the Input Volume slider to 0 (Switch at the end of the slider turns to "Off")
5. move the Input Volume slider to anything different than 0

Actual results:
Switch at the end of the slider turns to "On" but slider jumps back to 0

Expected results:
Slider should stay where it was set via mouse

Additional info:
This was tested on RHEL 7.2 Snapshot 4.1