I have installed a sleep monitoring app (Sleep as Android) on my LG G3.
It has a feature that dims the screen when the monitoring starts.
It was very annoying, so I disabled it in the settings of the app.
In the mornings I stopped the monitoring and resumed using my phone.
For a few days now, in normal usage (even if I read emails, or even play games!), my screen dims until it becomes dark grey (it is not locked) and I can't undim it, just lock and unlock.
I stopped the application but the dimming kept happening.
So ultimately, I uninstalled the app.
The dimming still happens, so I presume the app had some service installed that makes the screen dim.
When my phone tries to lock itself (after 2 minutes of idle screen time), the dimming wakes it up and they fight! You can see how it looks:
Can I somehow uninstall the dimming service?