Empty scene is not absolutely black on iOS

Development Platform & Builds Mobile
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1

I open an empty scene on iPhone X and see, that it is not as dark as an absolute dark. It is a little bit grey, just a bit. You can notice it because the camera offset on top of the phone becomes visible. I have next device profile:

[IOS DeviceProfile]
DeviceType=IOS
BaseProfileName=
+CVars=r.MobileContentScaleFactor=0
+CVars=r.DefaultFeature.Bloom=True
+CVars=r.DefaultFeature.AmbientOcclusionStaticFraction=False
+CVars=r.BloomQuality=4
+CVars=r.DepthOfFieldQuality=1
+CVars=r.LightShaftQuality=1
+CVars=r.RefractionQuality=1
+CVars=r.ShadowQuality=2
+CVars=r.HZBOcclusion=0
+CVars=r.EarlyZPass=0
+CVars=r.EarlyZPassMovable=0
+CVars=r.TranslucentLightingVolume=0
+CVars=r.AllowPointLightCubemapShadows=0
+CVars=r.PostProcessAAQuality=6
+CVars=r.MobileMSAA=4
+CVars=r.Decal.StencilSizeThreshold=-1
+CVars=r.MetalVertexParameterSize=50
+CVars=r.MetalPixelParameterSize=50
+CVars=slate.AbsoluteIndices=1
+CVars=r.MorphTarget.Mode=0
2

I suppose that’s because of USE_MSAA define block, which should be disabled for Metal:

	#if USE_MSAA
		// Do after jitter for grain as an optimization.
		SceneColor.rgb *= rcp(SceneColor.r*(-0.299) + SceneColor.g*(-0.587) + SceneColor.b*(-0.114) + 1.0);
		// Try to kill negatives and NaNs here
		SceneColor.rgb = max(SceneColor.rgb, 0);
	#endif
3

Problem was in tonemapper. For 4.19 I used next config to solve this problem:

+CVars=r.TonemapperFilm=0
+CVars=r.Mobile.TonemapperFilm=1

Property r.Mobile.TonemapperFilm=1 is the most important in this problem.