@Ranjib
I'm seeing some odd things with the lighting controls in 8.2. If I create a jack, then add a lighting control on that jack things seem to work fine initially.
Eventually, I can slide things around, clicking update, and it doesn't set it to the set value, even though the Update button went green. Sometimes it seems that it is a setting behind. Example, eventually I will set the slider to 85 and click update, but the value won't update according to the status log. I can then change it to 50 and click update and the value will update to 84. Change the slider again to 25 and it will update to 50.
I haven't found a way to really get it back on track other than a reboot, which sets it back to zero, but that doesn't always get it to respond properly.
Edit:
While typing this, I found that clicking the slider and using the arrow keys to increase or decrease the value before clicking Update makes it respond properly every time. It seems that using the mouse to slide it up and down isn't being read properly?