Grey lock screen question marks - General Questions and Answers

All of a sudden my lock screen turned grey with two question marks down the bottom. Fingerprint unlock doesn't work and I have to swipe up, enter my pin which takes me to my normal lock screen where I can then unlock normally.
The grey screen displays the time only which doesn't update, it stays the same no matter how much time has past.
I have no idea how this happened or how to fix this. Any help would be greatly appreciated.

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Screen flickering and goes black

My phone started doing some random screen flickering with black screen at the end, if I touch the screen I get a response (it vibrates), and if I unlock and open the screen goes back to normal for a while.
Is the screen gone or the band from the screen to the motherboard?
https://ibb.co/nLPtiy
Thank you!

[SOLVED] Half of the screen flickers black between unlock and home screen

Couldn't find any similar topic except in forums for s10+, OnePlus and other phones. Sorry if I missed anything.
As in the subject, after unlocking, approximately half of the screen flickers black and goes to the home screen. It takes less than a second. Always top half, bottom half shows home screen right after unlock. This does not happen on each unlock, but also, there is no pattern - it can be after 5 or 30 unlocks, it can be after 5 minutes or 10 hours of not using the phone. It started mid-July and not only annoys but is starting to worry me. Solutions from other threads didn't help. For example:
Fingerprint sensor problem - I don't use it, I have pin lock.
Samsung Pay issue - I don't even have it available, so, don't use it either .
Animations - setting them off did not help.
I cannot guess anymore what would be the cause, if it's some app which wakes up after unlock or what else. The only thing I've changed (except updating apps) was adding another sim card, but my tiny little brain cannot find connection. I didn't test removing it as I need this sim active and don't have backup phone right now. Also, I would really like to avoid resetting the phone...
Did you experienced anything similar?
Thanks a lot for any help or suggestion.
are using Samsung or some third party launcher. Did you wipe cache? Latest firmware updates?
Yes, I did both, firmware update and cache wiping, no change. I'm using stock launcher.
did you try in safe mode to exclude some app causing it
Yes, I tried safe mode without success.
i would take it to Samsung repair centre if pos
Thanks for trying and all the steps. There's nothing like that where I live, neither any advisory place except for hotline. I can drop it at their service but will need to wipe it down before, which I keep as the last resort. I'll keep waiting for another firmware update and if nothing changes then I'm willing to do the hard reset. I just hope it's not a symptom of some virus - I'm trying to be most careful, scanning device periodically, didn't root, so I naively count on being safe...
i don't think it's virus. fingers crossed it's just software issue
hi again, just to let you know, I think I know what was causing this flickering and now I feel silly . Home screen rotation. I had this option turned on, and it's possible that sometimes, when I put my phone on the table, home screen rotates to horizontal position. Of course it locks after few seconds. I've noticed it completely accidentally, because one time, when screen flickered black there was slow-motion rotation animation in the background (which I've never seen before). That's why flickering was completely random to me, not connected to any type of notification whatsoever. Well, it's not, it has a pattern . I've checked it plenty of times and each time I lock my phone with home screen in horizontal view, but unlock in vertical, half of the screen is flickering black. That's it, at least I believe it must be this, because it happens each time and never when I lock my screen in vertical position.
Once again thanks for all the help!

Oneplus 3 ubuntu lock screen issue

Hello
I just installed ubuntu on my old OP3 everything works great except the lock screen.
When the screen locks I can't unlock it anymore, I just get a black screen with a faint light in the background.
I tried removing the pin and swiping but didn't solve it.
Now every time it locks I have to reboot the phone .
Can anyone help me, please
Thanks in advance

Need app to lock screen position after unlock

I have annoying problem with my smartphone. When I take it out from pocket (where it sit most of the time upside down) and I unlock it fast with fingerprint, sceen goes horizontal, vertical, horizontal ( or the other way) until it finally stops vertical. Is there some kind of way to have it locked vertical when it starts unlock and keep it like that just for couple seconds ( I need autorotate to be turned on all the time/ the problem is just in those few seconds)
ruffpl said:
I have annoying problem with my smartphone. When I take it out from pocket (where it sit most of the time upside down) and I unlock it fast with fingerprint, sceen goes horizontal, vertical, horizontal ( or the other way) until it finally stops vertical. Is there some kind of way to have it locked vertical when it starts unlock and keep it like that just for couple seconds ( I need autorotate to be turned on all the time/ the problem is just in those few seconds)
Click to expand...
Click to collapse
That is probably a problem with how you're holding it when you unlock it and how quickly you're unlocking it.
Yes, I do it quick. But it is really annoying when this happens several times a day

Black lock screen. Solution exists?

Randomly, the lock screen becomes black. Only the status bar and the bottom "pill" are visible, and the rest of the screen is completely black. I can log in with the fingerprint sensor, but not something like password, because nothing is visible. Once this happens, this seems persistent until I reboot the device.​Is there a solution to this other than rebooting?​

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