CameraX:No available camera can be found.

E/CameraManager: Failed to parse camera Id /dev/video0 to integer
D/CameraRepository: Added camera: /dev/video0
W/Camera2CamcorderProfileProvider: Camera id is not an integer: /dev/video0, unable to create CamcorderProfileProvider
I/Camera2CameraInfo: Device Level: INFO_SUPPORTED_HARDWARE_LEVEL_EXTERNAL
D/CameraValidator: Verifying camera lens facing on pad, lensFacingInteger: null
E/CameraValidator: Camera LensFacing verification failed, existing cameras: [Camera@75e5ee1[id=/dev/video0]]
W/CameraX: Retry init. Start time 102582 current time 104905
androidx.camera.core.impl.CameraValidator$CameraIdListIncorrectException: Expected camera missing from device.
at androidx.camera.core.impl.CameraValidator.validateCameras(CameraValidator.java:95)
at androidx.camera.core.CameraX.lambda$initAndRetryRecursively$9$CameraX(CameraX.java:613)
at androidx.camera.core.-$$Lambda$CameraX$u-Xx2b6YXY5GXNXRh-mDiDnHdpQ.run(Unknown Source:10)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)
Caused by: java.lang.IllegalArgumentException: No available camera can be found.
at androidx.camera.core.CameraSelector.filter(CameraSelector.java:105)
at androidx.camera.core.CameraSelector.filter(CameraSelector.java:135)
at androidx.camera.core.CameraSelector.select(CameraSelector.java:75)
at androidx.camera.core.impl.CameraValidator.validateCameras(CameraValidator.java:81)
at androidx.camera.core.CameraX.lambda$initAndRetryRecursively$9$CameraX(CameraX.java:613) 
at androidx.camera.core.-$$Lambda$CameraX$u-Xx2b6YXY5GXNXRh-mDiDnHdpQ.run(Unknown Source:10) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
at java.lang.Thread.run(Thread.java:919) 

androidx.camera.core.impl.CameraValidator.java、CameraSelector.java、CameraX.java のスタックトレースのエントリポイントから始め、カメラ ID /dev/video0 と、失敗したレンズ向きの検証に注目します。影響を受けるデバイスでログを再現し、その後、このカメラに対して期待される処理を確立してから、修正とその検証方法を定義します。

索引モデルが issue の本文から書いたものです。