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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.
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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.
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iphone. helping computer illiteracy become popular since 2007.
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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.
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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.
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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.
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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.
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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.
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Yes my face literally flew off!
Hello everyone, this is my first post. So recently I have been having a certain issue concerning my lockscreen bothering me. It really isn't a deal breaker, but it messes with my OCD. So at random times, the lock and message (life companion) on my lock screen shrink as shown in the attached image. It does not seem to do anything except for bother me. The lock screen does this unpredictably, but it does not do it often. I have tried a hard reset a few times and it does not fix it. It even fixes itself after a once again, random amount of time. I am not rooted, I use basic touchwiz, basically its how I got it out of the box with some games I installed through humble bundle. Any ideas?
Pr1m4lcur5e said:
Hello everyone, this is my first post. So recently I have been having a certain issue concerning my lockscreen bothering me. It really isn't a deal breaker, but it messes with my OCD. So at random times, the lock and message (life companion) on my lock screen shrink as shown in the attached image. It does not seem to do anything except for bother me. The lock screen does this unpredictably, but it does not do it often. I have tried a hard reset a few times and it does not fix it. It even fixes itself after a once again, random amount of time. I am not rooted, I use basic touchwiz, basically its how I got it out of the box with some games I installed through humble bundle. Any ideas?
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It's a TW bug. It can also happen with the unlock "pad lock" icon that appears on the lock screen if you have no unlock effect enabled. It doesn't affect function and a restart fixes it. Happens to me maybe twice a month. Maybe it'll be squashed with the next official release. No biggie.
Hi,
I have a UK sim free model. It sometimes misinterprets a tap or adds a phantom tap. Its not terrible but I'm sure mine has a issue. A quick Google and a tweet tell me I am not alone. Anyone else seeing this? I could return but I'm dubious it's hardware related...just not sure if it's worth waiting for a software update...
RealEvil_UK said:
Hi,
I have a UK sim free model. It sometimes misinterprets a tap or adds a phantom tap. Its not terrible but I'm sure mine has a issue. A quick Google and a tweet tell me I am not alone. Anyone else seeing this? I could return but I'm dubious it's hardware related...just not sure if it's worth waiting for a software update...
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Click to collapse
I have same issues with my g4 here in the US.
Unfortunately same here, on a G4, korean model F500S.
I have the same issues on my G4. So probably returning it won't solve it. I notice it the most when I am scrolling in Facebook or web pages I will open a link accidently.
I have the same, occasionally it just won't respond to some taps, i find just pressing the standby on/off button quickly sorts it but it is very annoying.
same here in israel, sometimes do not respond to double tap on lock screen to wake the G4 up
im sure its a software issue, prolly the LP 5.1
Are so you guys using screen protectors? That was the issue for me with g3 and g2.
20degrees said:
Are so you guys using screen protectors? That was the issue for me with g3 and g2.
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Click to collapse
I am using the out-of-the-box protector on G4. So the thing u mentioned was it with this kinda protector or after-market glass protector?
Try...SGS Touchscreen Booster - Google Play Store
I have run into this same problem with my Verizon G4 (VS986). Many of my taps have gone unrecognized.
I did find this.... http://forum.xda-developers.com/g4/help/fix-touch-screen-registering-touches-t3128518
I tested the software that was recommended...and IT WORKED!
Give it a try...can't hurt!
nipun1110 said:
I am using the out-of-the-box protector on G4. So the thing u mentioned was it with this kinda protector or after-market glass protector?
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Click to collapse
After market but plastic.
Just started to get issues where taps on the far left-hand side of the screen don't work.
blackknightavalon said:
Just started to get issues where taps on the far left-hand side of the screen don't work.
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Okay, I was able to replicate my bug. It happens after playing a game and stops after some time. Turning autorotate back on and switching back and forth from landscape view fixed it.
Hey guys.
I was searching the forums for a fix that solves the phantom/ghost touches I'm getting frequently on my LG G4, H815 model.
Sorry for the long post but my case looks a little more complex than the ones I've been seen in here.
In my case, that's how it happens:
I receive several multi-touches at the same time, usually when Data is enabled. Sometimes it starts right when I switch from Wi-Fi.
It happens often when I'm driving and using Location+Data as well, which drives me crazy. I does also happens (like another user mentioned in this thread) when scrolling down a feed (such as on Facebook) and it suddenly likes/shares a photo/post. It also drives me crazy! And there is also the case where it taps the keyboard and send crazy typos on chat apps when you are real-time texting someone! Another hassle is right after using the camera and opening the gallery to show someone the taken photo...it suddenly scrolls the gallery and open another photo. I just can't make it to see the taken pic. Therefore, I really wanna fix this so bad since it happens every time I need something right away.
A workaround that's been helping, though it's a pain:
I found that pressing the On/Off button and giving it a few seconds will return it to a normal state. The problem is when it happens while I'm driving and are supposed to take an exit/make a turn at the moment. There are some other cases where I'm into something and giving this few seconds is not an option.
Trying right now:
Someone suggested in this thread to use the SGS Touchscreen Booster. I'm giving it a try right now.
Important notes:
This issue has been happening since I got this phone on November, 2015. We got this 6.0 update recently and I was hoping that it would fix it. It didn't.
I have an after market screen protector that I applied in order to see if the issue would go away. It also didn't.
I have been searching about a digitizer replacement but I don't think is a hardware issue, since it just doesn't happens when I'm only on Wifi at home with Data disabled. I believe that the problem is the Data connection that triggers smth.
Any thoughts?
Does anyone have any idea or have experienced the same scenario before? Any thoughts on my guess of data enabling triggering the ghost touches?
Sorry for the long post and thank you so much for reading it.
I think it's both, its hardware and software, LG tried to fixed it but it makes it worst. You can solve the problem for few seconds putting your five fingers at the home menu, It goes crazy and after it stopped making ****. Anyway this phone is great but all the problems make it ****.
I am going to use this thread even though I think my problem is not as serious as yours are.
My problem is that touches are registered, but no action is taken.
For example. Quickly tapping on an icon on the home screen will highlight it, but it will not open the application. I enabled the option in Developer mode to display the touches and the touch is registered. It's just that the app will not load. If I click for a tad longer - it loads. Happens on both stock Launcher and Action Launcher. I have not noticed it happening outside the launcher.
I read something about a keyboard update, but in the Update Center I don't have anything related to the keyboard.
The icons I see it happening with are located in the lower part of the screen.
I am almost sure that this is a software problem, but several updates have not fixed it. Currently on v20d.
Any suggestions or ideas?
After a few more testing and monitoring, I found out that the ghost touches only take place when I'm on LTE.
And even more weird, while driving through some specific areas when I'm commuting.
It's just so weird to think that some towers may send a LTE signal that may cause the ghost touches.
At home, at work, wifi or data, it doesn't happen.
Some 5t users noticed a very long wake delay on using 8.1 custom roms. It seems the screen is on as it reacts to touch input but stays rotaly black. Sometimes it even goes back off by itself when the phone is still locked. I lately noticed there is somekind of light below the amoled when the delay occurs. I was only able to see it when my screen was cracked due an accident. So the only logical explanation to me is that there must be somekind of black overlay preventing the user from seeing the content. Also the fact that some users never saw this bug on thair device it is possible that this issue is caused by some kind of google setting which is getting synched and the rom isnt fully compatible yet as it hasnt that implementation yet.
Many people keep saying its caused by pocket mode.
But its still present no matter what setting is used and even occurs after a fully clean installation of the rom without any changes to the default settings.
The only fully working workaround (no body is mentioning) i found out by my self, is to fully disable the lockscreen. xou have to disable swipe lockscreen too. The wake delay will never occure when there is no lockscreen at all.
I made this poll to see how many people had this problem and who didnt.
Who ever saw the wake issue by himself will understand the fact that i think all current 8.1 roms are almost impossible to use when having a lockscreen. Esspecialy at the morning it can take minutes to wake the phone no matter what unlock method/ swipe/ gesture/ password/ fp
i also provided all kind of logs and found the error lines. I showed them to all the devs of the different roms in telegram a month ago. But all we get is: "Disable pocket mode" and it clearly doesnt fix the problem.
one thing i also noticed is, that the problem started when the expanded screen feature got included (im not saying that disabling or enabling expanded desktop causes the issue)
Im not blaming any dev. Im just afraid this bug is beeing ingnored as most people never saw it happen.
I hope the dev will sort this issue as its literally the only bug preventing me from using custom roms.
Did you manage to fix the issue without disabling the lockscreen? I just got the phone yesterday and having this problem
Don't have any bugs you said above, just one issue that no body help me till now, in lastet ob4, the output sound when recording video/sound is really really low compared to the stable 5.04, I have to set the volume to the maximum level to hear clearly. I said this thing many times but may be it's just me, no one else.
do you use expanded desktop enabled on all apps? If so there's a Xposed fix http://repo.xposed.info/module/fr.merams.r.deepscreenoreo
I'm having multi-touch issues on my new S20. It works just fine with up to 5 touch points, but as soon as you start adding more points (using more fingers), touch panel starts to glitch, with touches quickly "flickering" in and out, as if I'm quickly tapping screen, sometimes working fine, other times glitching moderately or severely, use up to 5 points, and works flawlessly.
I noticed it while using Piano/Synth apps (such as Perfect Piano, ORG 2020), trying to play simple chords, for example every other white key, using as many fingers as I can, playing chords repeatedly. To make sure it's not app specific, I downloaded "Display Tester" app and used its "multi-touch test", same problem, panel registers 5 fingers flawlessly, but using more fingers, problems start to manifest themselves, sometimes immediately, other times not. To completely rule out downloaded apps, I enabled "pointer location" through Android's "developer options", and yep, testing on solid backgrounds (better visibility) reveals touches not registering properly. Removed factory screen protector, tried restarting phone, safe mode, enabling/disabling touch sensitivity, accidental touch detection, changing resolution, updating phone (all the latest updates as of July 3 2020).
The only thing I haven't tried is "TSP FW Update", through secret dialer code *#2663#, hearing horror stories of update failing (even seemingly succeeding) , and people losing touch panel functionality entirely, with no obvious way to flash older firmware since touch panels firmware lives separately from device's main firmware.
● So my question is, problems that I'm experiencing, are unique to my device, or is this widespread/normal?
I doubt many people would notice these problems since panel works flawlessly with up to 5 fingers, no glitches whatsoever.
● Can you, fellow S20 owners perform above described tests, and report back your results?
● Dialing secret dialer code *#2663#, what touch panel firmware version your phone displays? Maybe mine is old and needs updating, but I'm afraid of clicking that button, which leads me to my final question to experts
● Is there a way to backup touch panel firmware, and somehow reflash it, in case something goes wrong. Or once update fails, there's no way for a phone to communicate with panels controller?
Thanks
Just tried and yep, same thing
Also the thing you gave to update touch panel firmware tells me I'm already on latest so there is no point to use it
EDIT: I tried doing the display update thing for you, it didn't solve the problem
replying to jojos38; sharing more thoughts
:good: Thanks, jojos38, especially for your bravery regarding TSP FW update! (I read you still can control your phone using mouse and keyboard if update fails, but it's very challenging to reflash panel's firmware if something goes wrong, if it's even possible, because reflashing phone will not fix bricked touch controller).
I feel a little relieved I'm not the only one. I wonder just how widespread this is, I also wonder if Samsung uses same touch screen controller on all S20 devices. Seems like it's either panels limitation, or a software thing, I doubt it's a defect, because of how well it performs otherwise, but of course, who knows..
If this will get enough attention, maybe Samsung can release an update, or at least chime in.
Let's wait for more replies, and see what others have to say.