It happens always under OpenGL ES2, using Metal rendering works fine. It also happens using the post-processing stack (no matter the graphics API). I’m not sure what I’m talking about, but maybe is it related to the use of Shader Model 3?
Everything looks equal in the profiler, just the cpu and gpu ms increases.
Thanks in advance.
Hardware
iPhone X
Software
iOS 11.2
Unity 2017.3.1
XCode 9.2
Yes! I found a solution!
It looks like the iPhone goes to some kind of low energy mode. So I thought of something that maybe could work to “wake-up” the view again.
In the Xcode project, go to the UnityAppController.mm file, find the applicationDidBecomeActive function and add this line:
_unityView.alpha = 0.99f;
This wake ups the view again when you comeback to the application!
No more 40fps at low brightness! BUT you have to add that line every time you built your application.
Best regards!
I am also having this issue, my specs are also very same:
iPhone X,
iOS: 11.2.6,
Unity: 2017.3.1p4,
XCode: 9.2
The framerate drops suddenly after changing the device volume or using the Control Center. Then sometimes the fps comes back to normal after some seconds. But sometimes the fps stays very low till the end. Did you find any solution?