Develop Bugs

[BUG] Screen Sensitivity Issue-Lag (4.0.4-4.1.x)

Problem summary
Known cause (might be others): selecting an app from the Recents list (Task Switcher)
Temporary fix: turn the screen off, then back on
Workaround: avoid using Recents list (you can use a 3rd party task switcher instead)
How to test: open Messaging, hit Home, hit Recents, select Messaging from the list. Your screen will be less sensitive until you turn the screen off and back on. You can view the pressure by going to Settings -> Developer Options -> turn on Pointer Location. This will allow you to see the Prs of each tap in your status bar. Normally your lightest taps that register will show anywhere from 0.28 to 0.32. However, after this bug is activated, you will mostly get values over 0.40 for your light taps. This is actually a very noticeable increase, especially when trying to type quickly.
Please report any other known methods to "activate" this bug. After re-assigning my Recents button to a 3rd party app (I'm using Simple Task Switcher), I haven't seen this bug at all. It seems that a couple of people have seen it produced by something other than Recents, but they haven't narrowed it down (or reliably reproduced it on purpose).
Please star this issue officially so Google can fix:
Link is http://code.google.com/p/android/issues/detail?id=29734
Note: Downloading & using Screen filter application from play store, with brightness set to

Your hands are really dirty or really dry. Try moisturizer or something.

Been using my screen for almost hour straight now. No issues.
--------+++--------
iphone. helping computer illiteracy become popular since 2007.

Hehe yes this s gonna be a difficult one to confirm. But it is definitely not dirty hands. To clarify, a quick press of the power button to lock then unlock completely fixes the issue. Same fingers suddenly register perfectly. This is driving me nuts as the phone is not even usable right now. Literally.

@rbiter said:
Been using my screen for almost hour straight now. No issues.
--------+++--------
iphone. helping computer illiteracy become popular since 2007.
Click to expand...
Click to collapse
ios 6.2 doesnt get issues.

I don't know about your other experiences, but as far as the browser goes I have the same scrolling effects as you do. I think this is how it is meant to be. They tightened the scrolling a lot and I kinda like it. Before one small flick would send me across the whole page, which was kinda annoying. Just my preference.

I'm not having this problem. It would drive me crazy too. Been using my phone alot over the past two days and I didn't run into this problem even after almost 1h of continuous surfing. Also a few checkpoints of Shadowgun didn't trigger it.
But you can confirm your problem if you enable "cursor position" in the dev options (hope that's what it 's called in english). "Prs" and "Size" should need a lot more than around 0.30-0.40 to register your touch if you have the problem you describe.

I am sorry that you're experiencing this, but 4.0.4 has nothing to do with this. 4.0.4 is just software, Galaxy Nexus is not a pressure-sensitive device, it is merely touch-sensitive. Which means that software gets an analogue signal from the touchscreen, either 1 or 0. It has no 'range' of sensitivity, so it cannot decrease in sensitivity in software (if it did, then it would not work at all).
This is entirely hardware issue and I suggest either making sure your screen is clean, your screen protection thing (if you use one) isn't acting up or if your hardware has become faulty (have you dropped it recently?).
If problem persists then return under warranty.

My wife had this issue once.
It was the third party launcher she was using.
I don't think its a matter of touch sensitivity dropping, its a matter of the system just being too slow to really work right.
It was ADW EX, fwiw.

kristovaher said:
I am sorry that you're experiencing this, but 4.0.4 has nothing to do with this. 4.0.4 is just software, Galaxy Nexus is not a pressure-sensitive device, it is merely touch-sensitive. Which means that software gets an analogue signal from the touchscreen, either 1 or 0. It has no 'range' of sensitivity, so it cannot decrease in sensitivity in software (if it did, then it would not work at all).
This is entirely hardware issue and I suggest either making sure your screen is clean, your screen protection thing (if you use one) isn't acting up or if your hardware has become faulty (have you dropped it recently?).
If problem persists then return under warranty.
Click to expand...
Click to collapse
Lol that is hilarious. You forgot the step where its the OS that actually processes the input data, so in that process, a ton of problems can arise.
And personally, since 4.0.4 I have also been experiencing a "similar" issue. When scrolling down (and only down), I experience a kind of "lag" like if it only registers the swipe movement half an inch lower. Its not a big deal, but still an issue.
Edit : What he explains as "pressing very hard" is most likely the fact that when you press harder you actually cover more surface, so the amount of extra input data can definitely impact the behavior.

I had issues for a few hours after the 4.0.4 update, where my softkey buttons weren't responding. Thankfully, it seems to be fine now, but it was a cause for concern.
Sent from my Galaxy Nexus

gokpog said:
I'm not having this problem. It would drive me crazy too. Been using my phone alot over the past two days and I didn't run into this problem even after almost 1h of continuous surfing. Also a few checkpoints of Shadowgun didn't trigger it.
But you can confirm your problem if you enable "cursor position" in the dev options (hope that's what it 's called in english). "Prs" and "Size" should need a lot more than around 0.30-0.40 to register your touch if you have the problem you describe.
Click to expand...
Click to collapse
Thank you my friend, I should have thought of this; now I have numbers to confirm this. So with cursor option enabled I can get down to 0.30, managed 0.28 once. However when the bug starts, I can confirm that I cannot get below 0.60. It just refuses to register that input for some reason.
I lock the screen, 1 second is all it takes, and now it registers down to 0.30 again and all touch works properly. Its almost like some type of memory leak issue is the way it feels to me. It only starts happening after a few min of use.
Its definitely an issue now that I can see the pressure numbers. The question is what the hell can I do about it. I flashed aokp29 with the latest 4.0.4 ota merged in, problem still occurs. I'm gonna try stock 4.0.2 or 4.0.1 just to see. Thanks.

I have never had much luck upgrading Linux versions. That's why I start fresh every time with Android. Lol
Sent from my Galaxy Nexus using Tapatalk

Before I start digging, anyone know specifically which driver controls the touch input? I'll try looking thru github.
Also I was on stock 4.0.1 prior to this. So this could be normal behavior for everyone but everybody is used to it since nobody stayed on 4.0.1 like me. Cause I can easily say this is difficult to notice if you aren't paying attention. The question is, why does locking the screen temporarily change it back...

I can confirm some of what you are saying..sometimes when I'm browsing the scrolling tightens up..I lock the phone then unlock it and it is smooth again..doesn't happen all the time tho..doesn't bother me but I've noticed it
Sent from my Galaxy Nexus using XDA

I can also confirm. This morning I found the Swiftkey was lagging on Facebook. Something like the phone did not receive the touch. Then I rebooted and now it is ok.
I did not get this issue on 4.0.2 and I don't install anything new on 4.0.4.
The way I installed 4.0.4 was from the official factory image, so my phone is fresh! I reinstalled all apps manually as well. Nothing fancy apps.

I know this is my first post, but I can definitely confirm this issue.
I use my Galaxy Nexus for development, so the screen is always on. The sensitivity goes down very quickly.
My phone was an International GNEX that I loaded the US firmware on and then I flashed the OTA 4.0.4 update.

kristovaher said:
I am sorry that you're experiencing this, but 4.0.4 has nothing to do with this. 4.0.4 is just software, Galaxy Nexus is not a pressure-sensitive device, it is merely touch-sensitive. Which means that software gets an analogue signal from the touchscreen, either 1 or 0. It has no 'range' of sensitivity, so it cannot decrease in sensitivity in software (if it did, then it would not work at all).
This is entirely hardware issue and I suggest either making sure your screen is clean, your screen protection thing (if you use one) isn't acting up or if your hardware has become faulty (have you dropped it recently?).
If problem persists then return under warranty.
Click to expand...
Click to collapse
Just to point out, the phone is all digital. It does not get an analog signal from touching the screen. Also to that point you said analog but then described digital with the 1 and 0

Has anyone affected tried going between 4.0.2 and 4.0.4? To check the possibility of a driver or some related value changing.
Also, if not fixed by going back to 4.0.2, this could be due to current leakage from somewhere causing the touch to not work properly. I've seen it on other capacitive touch devices, though mainly when a non-compatible charger is connected. When you shut the screen off, the charge causing the problem/interference with the touch is temporarily dissapated, but then comes back after you use it again. Probably very unlikely in this case, unless Google changed something in the touch driver that makes it more sensitive to interference, which in turn messes with actual input from fingers.

TechNoir said:
Has anyone affected tried going between 4.0.2 and 4.0.4? To check the possibility of a driver or some related value changing.
Also, if not fixed by going back to 4.0.2, this could be due to current leakage from somewhere causing the touch to not work properly. I've seen it on other capacitive touch devices, though mainly when a non-compatible charger is connected. When you shut the screen off, the charge causing the problem/interference with the touch is temporarily dissapated, but then comes back after you use it again. Probably very unlikely in this case, unless Google changed something in the touch driver that makes it more sensitive to interference, which in turn messes with actual input from fingers.
Click to expand...
Click to collapse
Its possible. I was on 4.0.1 so perhaps this issue originated in 4.0.2 but I never noticed since I didn't update then. I can add that I did multiple wipes and clean flashes, and also tried both aokp 28 and 29 (new 4.0.4 ota merged), and happened on both.
I'll post what I just sent to arbiter which gives more insight.
From my extra testing under normal use my light touches register 0.28-0.33. Especially on swipes, the end of the swipe registers 0.28 as the finger travel breaks contact with the screen giving that swipe extra input which pushes the swipe motion further extra boost. When the bug starts the touch swipe won't even break 0.38-0.40, and that extra swipe data is lost resulting in the end of the swipe data points being excluded and swipes travel half the distance.
This gets exacerbated on the keyboard when fast typing light pressed. Its so bad it frustrates my face off cause typing just ceases to be possible. Such a difficult issue to diagnose.
Click to expand...
Click to collapse
Yes my face literally flew off!

[Q] Touch sensitivity issue cause?

I've been reading through the previous threads and I'm still confused if the issue is hardware or software related. I have the AUO panel and have broken swipes, and times where I can't scroll properly. This has been going on a couple months now and it's getting on my last nerve since it's frequently happening when I need my phone to work properly. All this time I assumed it was software but a couple threads mentioned it was hardware. Trouble is, some people with the JDI screen also have issues so I don't understand. My question is, has anyone ruled out software by flashing an AOSP rom? I'd rather not send this to Sony if at all possible since they don't cross ship and I'd be without a phone.

I have rarely an issue with the touch screen, when swipe up or down, it doesn't swipe it acts like I've just touched (clicked) once the display. I think it is a software issue, because in my case, if I turn off the display wait for 2-3 seconds and turn it on, it works with no problems.
Can you point me please to other threads that have this issue in discuss?
Thank you!

Have you removed the asf from the screen and placed an actual screen protector on it? I found that this really helped with the weird screen issues.

I have a screen protector over the ASF. But that has nothing to do with my issue, because, like I said, when I turn the display off, wait 3 seconds, and on again everything is working normally.

vibecatalin said:
I have a screen protector over the ASF. But that has nothing to do with my issue, because, like I said, when I turn the display off, wait 3 seconds, and on again everything is working normally.
Click to expand...
Click to collapse
Yeah, I reboot usually and the issue temporarily goes away. Then it will come back a day or two later. I'm afraid to remove the ASF because I've read some issues with goes touches even with a screen protector. I just want the issue to be fixed... I was thinking of flashing a AOSP rom but wanted to see if anyone with that ROM had any trouble or not. Maybe the L update in January will fix things.
Here are the resources I've read on this issue:
http://talk.sonymobile.com/t5/Xperia-Z1-Compact/Touchscreen-loosing-touch-issue/td-p/580111
http://johnhaller.com/blog/2014-03-06--sony-xperia-z1-z1s-touch-screen-issue
http://forum.xda-developers.com/showthread.php?t=2770293

I have rarely that issue, like I said I just turn off the screen, and after 2-3 seconds turn it on and it's gone. I'm sure this is a software related issue.

If it helps at all, I never had the issue in the two weeks I tried an aosp rom. However the camera and battery life were a bit lacking so I'm back on a stock rom.

I haven't have the issue too in the past weeks, I've wiping cache and dalvik cache pretty often , because I've installed some system apps. Anyway I will really want to know the cause of this
L.E. I'm still on stock firmware.
L.E. 2 : The Glove mode function, in the Settings-Display menu has an application or something? Has a file redirected to it? Is there in the phone's system a file than can be edited or deleted or something for the glove mode function? Maybe we will find answers there.
I'm not sure that I've made myself understood with the question.

Fingerprint sensor not working occasionally

I've been recently getting some instances where I would lock the phone and the fingerprint sensor won't respond to my finger.
This really started when I changed my lock to pattern swiping. Anyone have the same issue? I rebooted and changed it back to pin lock and it seems to be working all the time again, but I don't know what caused it in the first place.
Thoughts?

How many fingerprints do you have saved? I have 3. 2 of my left index finger and one of my right. 95% of the time I use my left. Set up several and see if that helps. Move your finger all over the sensor when setting it up so it gets a broad picture of your fingerprint

jbdan said:
How many fingerprints do you have saved? I have 3. 2 of my left index finger and one of my right. 95% of the time I use my left. Set up several and see if that helps. Move your finger all over the sensor when setting it up so it gets a broad picture of your fingerprint
Click to expand...
Click to collapse
It's not that it doesn't recognize my fingerprints, but it doesn't recognize fingerprints in general. So when I put my finger on it, it doesn't do the double buzz, it's just non responsive.

this happened to me yesterday several times. And i received phone yesterday... . I have two prints. Left and right index fingers. It didnt fail, just was as my finger wasnt in the reader
MDB08L

experienced the same thing this morning. phone was plugged charging and finger print would not detect, had to manually hit the power button then it worked. i find there are a lot of issues when the phone is charging though, screen sometimes becomes very unresponsive while charging. i think there was a similar thread about that as well.

Just started having this today as well. Sometimes doesn't acknowledge fingertip at all; works if i press lock button to wake the screen. Kind of a bummer, otherwise very satisfied overall. Hope it's just something that can be ironed out with a software update.
---------- Post added at 11:58 PM ---------- Previous post was at 11:52 PM ----------
Nothing out of the ordinary installed. Twitter, Instagram, Dropbox, etc. Nothing to interfere with lock screen. I do use pattern unlock.
EDIT: Will try PIN unlock instead of pattern for a while to see if it acts any differently.

ajmalott said:
Just started having this today as well. Sometimes doesn't acknowledge fingertip at all; works if i press lock button to wake the screen. Kind of a bummer, otherwise very satisfied overall. Hope it's just something that can be ironed out with a software update.
---------- Post added at 11:58 PM ---------- Previous post was at 11:52 PM ----------
Nothing out of the ordinary installed. Twitter, Instagram, Dropbox, etc. Nothing to interfere with lock screen. I do use pattern unlock.
EDIT: Will try PIN unlock instead of pattern for a while to see if it acts any differently.
Click to expand...
Click to collapse
Any luck? I did a system wipe after unlocking, and flashed new factory images but still happening.

No luck. Still happening either way. I'd say maybe 10% of the time, fingerprint unlock works correctly. The other 90% I have to wake the screen with the lock button first. Sometimes after trying fingerprint multiple times, when I press the lock button and the screen wakes there is a little message at the bottom that says "Fingerprint hardware unavailable" in red where the little fingerprint icon usually is. But then it immediately changes to the fingerprint icon and it works fine.

ajmalott said:
No luck. Still happening either way. I'd say maybe 10% of the time, fingerprint unlock works correctly. The other 90% I have to wake the screen with the lock button first. Sometimes after trying fingerprint multiple times, when I press the lock button and the screen wakes there is a little message at the bottom that says "Fingerprint hardware unavailable" in red where the little fingerprint icon usually is. But then it immediately changes to the fingerprint icon and it works fine.
Click to expand...
Click to collapse
I was able to find a bit more about this issue. When it happened again, I pressed the power button and quickly checked the fingerprint icon at the bottom of the lockscreen and it turned red and said "fingerprint hardware not available" for a split second before turning white again. I searched that error message and got this thread https://www.reddit.com/r/nexus5x/comments/3pm3lv/fingerprint_hardware_not_available/
I'll try wiping the cache and see if that helps at all. If not, I'm going to RMA.

jadesocket said:
I'll try wiping the cache and see if that helps at all. If not, I'm going to RMA.
Click to expand...
Click to collapse
I'm not much of a tinkerer, but I'll give this a shot. If it clears it up then okay, but if it happens again I'll probably RMA too. Not willing to put up with such inconsistencies on a brand new phone with such a highly touted feature.
Unrelated, this is actually already my second Nexus 5X. The first one I received would not take a charge, and I didn't have another USB Type-C cable to test, so they sent me an entirely new package. If wiping cache doesn't do it, I'm really not sure if I should bother with a third Nexus 5X. Kind of disheartening. I really enjoy the device otherwise.

So far so good for me, Let me know how it goes for you!

jadesocket said:
So far so good for me, Let me know how it goes for you!
Click to expand...
Click to collapse
Still happening today.

ajmalott said:
Still happening today.
Click to expand...
Click to collapse
That's a bummer. It actually happened again today for me too.

jadesocket said:
That's a bummer. It actually happened again today for me too.
Click to expand...
Click to collapse
I chatted with a Google support rep today, describing the issue and sending links to other message boards that are discussing this topic. He had me restart the phone in safe mode and sent a follow-up email, asking me to check back in after a few hours or a day or whenever, and let him know if the issue happens again. This was about seven or eight hours ago, and I haven't had the fingerprint sensor fail once when pulling the phone out of my pocket. It seems possible that a third-party app is interfering with the sensor's ability to function when the device is locked and the screen is off. I haven't installed very many apps, and they're all mainstream ones that everybody uses. My next step may be to factory reset the phone and stick to stock install for a day or two, then maybe add apps like Twitter, Instagram, etc., back one at a time per day and see if the issue returns. If it is a software issue, I don't think an RMA is necessary.
EDIT: Well it just did it, never mind all that

ajmalott said:
I chatted with a Google support rep today, describing the issue and sending links to other message boards that are discussing this topic. He had me restart the phone in safe mode and sent a follow-up email, asking me to check back in after a few hours or a day or whenever, and let him know if the issue happens again. This was about seven or eight hours ago, and I haven't had the fingerprint sensor fail once when pulling the phone out of my pocket. It seems possible that a third-party app is interfering with the sensor's ability to function when the device is locked and the screen is off. I haven't installed very many apps, and they're all mainstream ones that everybody uses. My next step may be to factory reset the phone and stick to stock install for a day or two, then maybe add apps like Twitter, Instagram, etc., back one at a time per day and see if the issue returns. If it is a software issue, I don't think an RMA is necessary.
EDIT: Well it just did it, never mind all that
Click to expand...
Click to collapse
I had hope Looks like RMA imminent for me. I put that glass screen protector on so well...

ajmalott said:
EDIT: Well it just did it, never mind all that
Click to expand...
Click to collapse
Lots of apps updated in the past week. The problem hasn't resurfaced for a whole 48 hours now. Hoping I can put this behind me

jadesocket said:
That's a bummer. It actually happened again today for me too.
Click to expand...
Click to collapse
I've spent the past week emailing back and forth with Google tech support, sending in bug reports, even sending a video of the problem happening (and showing the fingerprint sensor working immediately after pressing the lock button). They've determined that the fingerprint sensor hardware itself is fine, and the problem is that instead of waking the screen it's telling the phone to go into Doze. I'm still sending them bug reports, and they're trying to replicate the problem on their own Nexus 5X to determine what (possibly an app?) is causing the problem. I'll report back in with any more information, in case anyone else has the problem and ends up here.

It happened to me too, stock phone, no third apps installed. I will keep an eye on this.
off-topic: the discoloration of the back of the phone it's very bad!

ajmalott said:
I've spent the past week emailing back and forth with Google tech support, sending in bug reports, even sending a video of the problem happening (and showing the fingerprint sensor working immediately after pressing the lock button). They've determined that the fingerprint sensor hardware itself is fine, and the problem is that instead of waking the screen it's telling the phone to go into Doze. I'm still sending them bug reports, and they're trying to replicate the problem on their own Nexus 5X to determine what (possibly an app?) is causing the problem. I'll report back in with any more information, in case anyone else has the problem and ends up here.
Click to expand...
Click to collapse
I believe it's not the hardware as well. I've noticed that it's mainly when I get notifications from something that the sensor stops working.

jadesocket said:
I believe it's not the hardware as well. I've noticed that it's mainly when I get notifications from something that the sensor stops working.
Click to expand...
Click to collapse
Did a factory reset, and the problem came back almost immediately. Google tech support wanted me to reinstall OS entirely, but I don't have the right cable (type C to type A) to hook up to computer, so they just gave RMA. Got the new one on Friday, so far so good. But then, with the last phone, the issue didn't appear until after a week or two. Fingers pressed. Tech support really seemed to take my case as a rarity, and they were unable to recreate it with their own device. Here's hoping it's just limited to a few devices.
P.S. Off topic, but Google support wouldn't give me anything for the Black Friday deal. I asked multiple times in multiple ways. Oh well.

screen stutter, complete loss of touch.

Been using the phone for the last 12 hours and I noticed something towards the end of my use last night.
The screen seemed to become unresponsive. And when it would work it would start to make its own input when scrolling and opening any app or link my finger would drag over while scrolling.
Changed refresh rates, changed resolutions, even seen if the blue light filter was the issue. Nothing.
Almost seems like the screen drops frames when scrolling, like it gets caught on something.

New development. Fingerprint sensor doesn't respond at all and inputting a pattern is damn near impossible. Going to try removing the screen protector to see if that could also be the issue

Did a factory reset
Issue seems to be where the finger print scanner is
It's almost like a dead or unresponsive zone.

Sounds like a factory defect, better have it replaced if resetting didn't worked.

Small video showing when scrolling over the fingerprint reader, the screen almost loses input

Defect.

Samsung has been little help lol. They want me to send it in for repair instead of an exchange. They also said to just order a whole new one and return the one I have now except the black 128 is sold out

imtjnotu said:
Samsung has been little help lol. They want me to send it in for repair instead of an exchange. They also said to just order a whole new one and return the one I have now except the black 128 is sold out
Click to expand...
Click to collapse
Sounds like Samsung support LOL...sorry you're having issues

Did you remove the factory installed screen protector? Maybe it's the cause of the issue

Return that pal, that doesn't sound good at all.

lovers74 said:
Did you remove the factory installed screen protector? Maybe it's the cause of the issue
Click to expand...
Click to collapse
one of the first things i did to trouble shoot. still having the issue. sometimes the screen completely loses all touch registration and it doesnt even know im trying to swipe or push on things. just realized it did this also after tmobiles new software update.
im still waiting here to hear back from samsung on how they are going to fix this issue

The same thing happens to me. Pulling down the notification shade seems to be the only thing that still works. It seems to goose the phone and it starts working again.

Test using the *#0*# diagnostic menu and use the Touch test.

Green tint only on unlocking device - acceptable?

I bought this used s9 for quite affordable price. Everything looked fine during testing except a greenish shade which happens only when unlocked and happens for like a second.
On searching internet, i found threads, yt videos by a number of people, almost all claiming that it is an update consequence. My questions are
1. Is it a software issue? If yes, can I expect some wayto solve - official ota or root and custom or old rom (if possible at all)?
2. If not software issue, is it a software induced hardware issue? Any way to repair without paying full for display?
2.1 If i get it replaced somehow, will itcome back again?
3. In any case, if I don't get it repaired, how long can I expect the deviceto be functional; ie before this green shade becomes permanent instead of being intermittent making device unusable?
Thank you

If it only happens for a second the only thing I be concerned about by the possibility of a rootkit or virus.
If running on Android 9 or higher and you did a factory reset already, that should have killed any unwanted critters.
Do a display check with ScreenTest. If it passes it should be good to go and just a transient glitch.
You've heard of The Matrix, right?

blackhawk said:
If it only happens for a second the only thing I be concerned about by the possibility of a rootkit or virus.
If running on Android 9 or higher and you did a factory reset already, that should have killed any unwanted critters.
Do a display check with ScreenTest. If it passes it should be good to go and just a transient glitch.
You've heard of The Matrix, right?
Click to expand...
Click to collapse
Hahah
This is something different. I asked a reseller and he said that such displays may last anywhere from 1 hour to 1 year.
Internet is filled with such questions.
Can you please help answering other questions if not this one, like if downgrading to older android possible or not?

The green only lasts for a second or so when opening the lock screen?
Never any other time?
Then it's not hardware.
AMOLED displays can last for many years. ScreenTest gives you a good idea of it's condition. Generally failure is gradual with the blue pixels failing first, red last.
The boot loader version dictates if you can downgrade or not.

...

blackhawk said:
The green only lasts for a second or so when opening the lock screen?
Never any other time?
Then it's not hardware.
AMOLED displays can last for many years. ScreenTest gives you a good idea of it's condition. Generally failure is gradual with the blue pixels failing first, red last.
The boot loader version dictates if you can downgrade or not.
Click to expand...
Click to collapse
So far, only immediately after unlocking. Haven't used much tho.
People say temp fix to all such issues is to Enable Always On display and double tap to wake screen instead of using Power button.
Can you ease tell which ScreenTest app it is? Playstore shows several with similar names.

tarun0 said:
So far, only immediately after unlocking. Haven't used much tho.
People say temp fix to all such issues is to Enable Always On display and double tap to wake screen instead of using Power button.
Can you ease tell which ScreenTest app it is? Playstore shows several with similar names.
Click to expand...
Click to collapse
Like I said if it's transient it's no issue.
This is the one I use:

Hi.
My s9 has this problem which everything turns green or worst, depending on the brightness level.
I can repeat the bug 100% of the time: just use the power button to turn off the phone two times: one to put into black screen and again to turn on. Then the screen misses some horizontal lines and is all buggy.
I shall record a video to share my problem but again, this can only be avoided by using aways on display to turn on the phone and then all goes back to normal.

spamtoaster said:
Hi.
My s9 has this problem which everything turns green or worst, depending on the brightness level.
I can repeat the bug 100% of the time: just use the power button to turn off the phone two times: one to put into black screen and again to turn on. Then the screen misses some horizontal lines and is all buggy.
I shall record a video to share my problem but again, this can only be avoided by using aways on display to turn on the phone and then all goes back to normal.
Click to expand...
Click to collapse
Try clearing the system cache.
A hard reboot.
Try in safe mode.
A factory reset may help but if that fails try flashing to the same version. If Android 8 or lower it could be caused by a rootkit that a factory reset won't purged. However this isn't a typical symptom nonetheless the firmware maybe corrupted.
If none of the above works it's a hardware failure, likely the display.