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Won't Fix

Won't Fix in 2020.3.X



Found in


Issue ID




[Android] Maximum deltaTime is reached when opening an app from the background



Reproduction steps:

# Open the user’s attached project (“My project (1).zip“)
# Open the “Assets/Scenes/SampleScene.unity“ Scene
# Build and run on an Android device
# Open the Window > Analysis > Android Logcat window
# Press the “Home” button to send the app to the background
# Press the “Overview” button and open the app from the background
# Observe the Android Logcat window

Expected result: Notice that all frames have similar deltaTime values that are not 0.3333333
Actual result: Notice that the 3rd (or the 2nd or 4th ...) frame after resuming the app has the deltaTime of 0.3333333

Reproducible with: 2020.3.42f1
Not reproducible with: 2021.2.0a20, 2021.3.14f1, 2022.1.23f1, 2022.2.0f1, 2023.1.0a20
Could not test with: 2021.1.0a1, 2021.2.0a19 (com.unity.collab-proxy@1.17.2\Editor\Collaborate\Components\AdapterListView.cs(40,24): error CS1061: 'ListView' does not contain a definition for 'fixedItemHeight' and no accessible extension method 'fixedItemHeight' accepting a first argument of type 'ListView' could be found)

Reproducible with devices:
VLNQA00332, Samsung Galaxy XCover4 (SM-G390F), Android 9, CPU: Exynos 7 Quad 7570, GPU: Mali-T720
VLNQA00325, Samsung Galaxy Note10 (SM-N970F), Android 12, CPU: NOT FOUND, GPU: Mali-G76
VLNQA00318, Oneplus OnePlus 7 Pro (GM1913), Android 11, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00231, Samsung Galaxy A5(2017) (SM-A520F), Android 8.0.0, CPU: Exynos 7 Octa 7880, GPU: Mali-T830
VLNQA00231, Huawei HUAWEI Mate 20 Pro (LYA-L29), Android 9, CPU: HiSilicon Kirin 980, GPU: Mali-G76

Not reproducible with devices:
VLNQA00494 - iPhone 14 Pro Max, 16.0.3 iOS
VLNQA00358 - iPhone 12, 14.1 iOS
VLNQA00392 - iPad (9th generation), 15.0 iOS
VLNQA00310 - iPad Pro 12.9", 13.4.1 iOS

Reproduced on: Windows 10 Enterprise 21H2


* Notice that there is no evident spike in the profiler that would explain this
* 0.33s is the [Time|].maximumDeltaTime defined by the app

  1. Resolution Note:

    There are no fixes planned for this Bug

  2. Resolution Note (2020.3.X):

    Fixed in 2021.2.0a19. Fix is not backporteable.

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