this post was submitted on 20 Oct 2023
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you probably have face/iris unlock enabled, I dont have that phone specifically, but some phones will use the screen to make sure there is enough light for the sensor to work
EDIT: I thin it might just be face unlock
I did have face unlock enabled. I doubted it was the cause of the issue, but went ahead and disabled it, can confirm that it's still flashing me.
I can't say what it could be then. I would be inclined to think it a software bug considering it seems to only happen under this specific scenario?
In further testing, any use of the fingerprint sensor can cause it. Lock screen, or in app authentication. It's like the flash that's normally under just the scanner instead happens on the entire screen. It happens consistently if I tap the scanner for about the shortest possible time I physically can.
ah, that might indeed be indicative of a hardware faliure
No, face unlock on Pixels doesn't do anything to illuminate your face, it simply refuses to work if the lighting's too dim. It's actually worse than the face unlock in Google Smart Lock in dealing with low light environments.
*most pixels
The 4XL had the best face detection in the industry, employing an additional infrared camera with its own invisible light.
I didn't buy a pixel 4 because it was Google's first attempt at face unlock. Decided to spice things up and get an iPhone for a change. FaceID is fanfuckingtadtic and I'm sad that my pixel 7 doesn't have proper face unlock.
Imo: rear mounted fingerprint sensor > proper face unlock > under screen fingerprint.
I just edited OP with a video.