Various touchscreen issues with S7+ 5G

Search This thread

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
UPDATE: I'm putting the original post inside a spoiler as the old stuffs were a bit messy and outdated. Most of the original post were written during Android 10 and things have changed quite a bit since then.

Simply put, the touchscreen of this tablet is a bit problematic which makes it not a good idea for serious gaming, though it doesn't seem to affect office/production use as much.

The cause is still unknown and I can't be sure if this is due to hardware or software, or a mix of both. Should point out that the issues persist after switching to a GSI, so the stock ROM is not entirely to blame.

Some ongoing issues:
1. Touches randomly fail to register, and with inconsistent response time (sometimes early or late than average).
2. Touchscreen occasionally stops responding, dropping or delaying a lot of taps. This has become worse since BUD2 as I started having longer periods, and now virtually no touches get registered when it happens. I wonder if this is a side effect of the ghost tap mitigations, as this becomes significantly worse since BUD2.

Some issues appeared to have been mitigated after FW upgrades:
1. Ghost taps during holds and swipes. This has become lessened since Android 11 and is mostly gone since BUD2.
2. Random auto taps at the edges of screen. Haven't gotten once since BUC1 but I can't be sure it's really gone away.
3. Touches may get registered prematurely (when finger is still a few millimeters away from the screen). This has become lessened since Android 11.

NOTE: S-Pen functions differently and the touch issues may not be applicable to that. To the system, S-Pen is considered a pointer device (in GSI you can see a mouse pointer appear when hovering it above the screen), with significantly higher sampling rate than the normal touchscreen (roughly 200%-300% according to tests).

EDIT: At least with GSI, S-Pen taps are considered left mouse clicks which do not work in games that explicitly expect a touchscreen tap, and it appears to continue to work even when the touchscreen is malfunctioning (further tests and experiments needed).

It seems the tablet's touchscreen has several issues that I cannot be sure whether the issue is hardware related, software related, or a mix of both. I've been following this thread, but it seems the issue I'm having is more than what the OP was having so I'm considering moving the questions here.

I'm currently experiencing a variety of issues with the touchscreen that, while not a major problem for normal use, can be a serious issue for some games where accurate taps matter. However, the issue is very hard to track as while the problem happened a bit too often inside games, I couldn't easily reproduce the issue outside those games on testing apps despite trying to mimic the original situation. Although the game itself might be having issues, I don't think it's likely as I've played some of them on my smartphone before migrating them to this tablet and I never had any significant issues back then.

The tablet currently has a a tempered glass screen protector installed, and I'm using the tablet with a Type-C audio cable to play its audio from my desktop speakers. (NOTE: S7/S7+ has limited accessories support, that for now, I can only either charge or connect the tablet to the speakers, but not both, as splitters aren't supported) The possibility of the audio cable can be mostly ruled out as I'm encountering those touch issues both with and without it.

The tablet underwent about 3-4 updates and is currently up-to-date. I don't think there were any difference in this among the versions.

Here's what I've found about my tablet's touchscreen:

(DISCLAIMER: I can't prove the reliability of the app used for testing, Multi Touch Test, so it's mostly a reference in case someone wants to try to reproduce. There are more apps that can be used for such testing.)

1. Touchscreen may sometimes not registering taps, or late. In some games this is observed as some taps missed, or registered late (a tap/hold being recognized by the game as much as ~1s later). However, I can't really reproduce this in the test app.

2. Touchscreen may register touches before the finger physically reaches the screen (about 1-2 mm). I'm not sure if static electricity can cause it and this might be considered a normal behavior, but personally I'm feeling the response range is still too long compared to other phones/tablets I have, that it's easier to accidentally tap something, or let something register too early.

3. A tap may be registered more than once. It appears to be easier to reproduce when doing multi touches, but it still happens in some games with fewer simultaneous taps. I managed to get 5 touch/hold events registered with the test app despite using only 4 fingers (4 real touches) sometimes. Although I know bad charger cables can cause this (as well as other erratic touch behaviors), in my case there were no chargers attached (since the port's already been used by the audio cable).

4. When holding and dragging, additional taps may be generated (it can be noticed in some games that have tap sounds for all taps, including invalid ones, as these additional "taps" can be heard). Again, this appears to be easier to reproduce when doing multi touches, as I'm able to occasionally get 5-6 touch events when dragging with only 4 fingers. The drag itself seems consistent, as I haven't observed any abrupt interruptions of valid dragging actions in-game and in other places.
UPDATE (2020.11.22): At one time I was able to reliably reproduce the problematic behavior at some specific regions with the Multi-Touch Test app. To be precise, with the tablet placed landscape (camera facing up), while holding the lower-right part of the screen with my right hand finger, holding and dragging the lower-left region with my left hand finger resulted in a ghosted, inconsistent 3rd tap near where my left hand finger was holding/dragging (matching the issue I'm currently having within some games). It seems for some reasons that particular region of the touchscreen is indeed oversensitive as I was also able to reliably reproduce issues 2/3 at that time. The issue mostly went away after powering the device off and cleaning the screen as I was not able to reproduce it afterwards. Not sure about my current protector's quality, but I might need to look for an option that's more sweat-resilent, as my hands tend to produce sweat over time and that used to cause some serious issues with touching.

5. While testing in the test app, The taps might be stuck if I also let finger pads touch the screen while holding it with fingertip, and it stayed there even after I released my hand and touched elsewhere. Make as many multi touch events might clear it. Not sure if this is a normal behavior (possibly related to palm-related interactions such as palm swipe to take screenshot), or is an error with the test app itself.

6. In rare cases, the touchscreen would stop responding to most of the taps which I suspect this might be hardware related as the issues occur at specific regions. I used to experience such issues with iPads before (4th gen and Pro 2015) which is why I decided to go on with Android-based ones. This issue is not consistent and would go away after a while so usually pausing and doing something else would work.
UPDATE(2020.12.13): I witnessed something interesting. When the tablet stops registering the taps, it might be due to it continuously generating ghost taps on some screen edges near the last few spots I previously touched, completely on its own (my hands weren't even near the tablet). The issue went away after reboot. I forgot to make a logcat as I was in a bit hurry... I'm currently on the November update, but the issue happened even before the updates. It doesn't frequently happen, though.

UPDATE: This is after using the tablet a bit more...

1. Having a screen protector may or may not affect touches, but usually should not be significant, unless the protector is of very poor quality. The market for such can be a bit messy, and quality varies even with the same product. A same protector might work very well for some, but not for others.
2. Under my current circumstances, my S7+ can at most reliably take 3 multi-touches, and sometimes 4 (despite the touchscren can register at most 10). Putting more multi-touches would gradually cause the touch sensor to err and become unable to register taps on time. (While I usually use at most my index and middle fingers, sometimes things can get too complicated that requires me to use my ring fingers as well, and that's when touch-related problems usually start to occur).
3. Although not that often, when the touchscreen started to err, touches might randomly get registered even with my finger hovering quite a few millimeters above the place I'm thinking about touching. I'm still looking for the reason why.
4. The effectiveness of Touchscreen Repair is still uncertain, but it seems to work to some extent to help mitigating issues. However, it doesn't appear to allow me to repeatedly calibrate the screen.
5. Forcing the tablet to run at 60Hz (Motion Smoothness: Standard) would mitigate touch issues with some games that can't really achieve 120fps with most effects turned on. Sadly, some games can be quite demanding even on this tablet's SoC. Some touch issues are more likely to reproduce when the system starts to stutter, so it may be a good idea to turn off some effects if feasible. Not sure if the overall performance can be improved with a custom kernel in the future.
 
Last edited:

cheetah2k

Senior Member
May 27, 2008
1,472
194
Brisbane
I've had similar issues with mine, during game play - it starts off fine, then the screen starts to lag and many missed inputs... Had an update yesterday, but haven't tried it yet
 

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
I've had similar issues with mine, during game play - it starts off fine, then the screen starts to lag and many missed inputs... Had an update yesterday, but haven't tried it yet

Not sure what might be causing the issues. While not really an issue for normal use, but in some games it can be really frustrating to find it so difficult to full combo even on lower difficulty levels such as Easy because at least one tap would fail to register correctly in almost every play.

In my cases, the tablet mainly lags/stutters when it throttles due to overheat (if played for a prolonged amount of time). There's really no easy fix for that issue as it's very normal for such beefy SoCs to reach high temperatures.

Honestly, the tablet is too bloated in terms of touchscreen-related features (like S-Pen and palm gestures). Not sure if the touchscreen sensitivity was adjusted to make sure these features work without major issues, which in turn can cause some side effects that only gamers would find them annoying. The touchscreen is indeed oversensitive as some other people have reported, that touches sometimes get registered too easily to the point that it sometimes results in undesired touches, such as being too early (registered before the finger actually landed), or ghosted (a touch appeared as two or more).

Back then I got myself a Pixel C that I flashed with custom ROMs since day one and I never had any issues like this. Although it started developing similar symptoms later on, it turned out to be caused by a swollen battery and the issues went away after replacing it.

Unlike that time, for S7+ I hardly ever had the charger plugged (only when I turned it off and when the battery is really getting low), and there are also no apparent signs of a potential battery issue developing as far as I can see.

EDIT: I'm yet to be able to get another update... but it seems with prolonged gameplay the tablet may become very hot and the touchscreen becomes completely erratic in-game despite the game itself might not be stuttering (and sometimes this would cost me dearly).

I suspect when the SoC overheats the throttle impaired the system's touchscreen recognition and the reason why I'm not able to reproduce every issue outside games is that the tablet would not be as hot as when in-game due to reduced load. Guess I need to look for a way to keep the tablet cool while playing... Once again, it the nature for such beefy SoC to overheat over time.
 
Last edited:
  • Like
Reactions: riyahsahul

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
Bumping this myself as I discovered something.

It seems forcing the S7+ to 60fps (Display -> Motion Smoothness -> Standard) can significantly mitigate the repeated/ghosted taps issue, and varying improvements regarding other touchscreen issues. I cannot say the issue is completely gone this way as I still encounter it from time to time, but with the tablet running at 60fps these issues are significantly less frequent to happen.

Either some background services might be interfering, or that some games can't really handle 120fps with most effects turned on. Guess I might need to experiment on how to disable certain system apps/features that I don't use and can't be disabled normally from the App settings, to further reduce background resource consumption. Hope the pm shell commands can work even without root.

As for stuttering, if caused by the tablet being overheating badly, placing it on a laptop cooling pad (that has fans in it) might help reducing the device's temperature a little bit. Also, tablet covers may block the airflow and limit such method's effectiveness, but I'm worried that the tablet's body might be too slippery without an appropriate cover to maintain enough friction to prevent the tablet from moving while using it.

EDIT: It seems some apps could misbehave when tapping repeatedly somehow (for trying to quickly skip some result screens)... and taps would start registering late, as late as ~1s. It appears as when tapping on a button, at first nothing happens, about a second later the tap against the button gets registered and things would proceed. The problem usually goes away after restarting the app.
 
Last edited:

MyAndroids

Member
Nov 19, 2020
6
0
The tablet currently has a a tempered glass screen protector installed,

Sorry I did not read All you wrote, I have S7+5G with latest Nov Update.
Personally I would REMOVE the Screen protector, do not like them and they create UI problems, why do you think you need one?, are you rough with Tablet (or Phone), just clean class regularly, try it??
 

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
The tablet currently has a a tempered glass screen protector installed,

Sorry I did not read All you wrote, I have S7+5G with latest Nov Update.
Personally I would REMOVE the Screen protector, do not like them and they create UI problems, why do you think you need one?, are you rough with Tablet (or Phone), just clean class regularly, try it??

I cannot rule out the screen protector might affect input, but personally the impact on input sensitivity/precision with tempered glass ones is not that significant. With this tablet I do regularly clean the screen. Nowadays I also use such protectors on my phone, and I hardly ever had any touch-related issues directly caused by screen protectors.

On the other hand, a long time ago I had an iPad Pro which started developing similar symptoms (missed taps, interrupted holds). Back then I had a PET screen protector installed on it, and because of that I removed the protector later on, thinking that might be the culprit, but the symptoms were still there, so the screen protector was NOT the real issue.

And honestly my fingers can indeed be a bit rough with tablet and phones that it's necessary to install a protector, or it'll leave some permanent marks after prolonged use (that when I clean the screen, the areas that I swiped most frequent during gaming would be visible).

EDIT: Not sure when did the November update come out. My device is still on October update and as of now no new updates are available.

EDIT 2: Will update the OP a bit.

EDIT 3: I think some Samsung stuffs is indeed interfering (or at least taking up precious resources) as I did a logcat and noticed something mentioning Game Manager (which I do not want to activate, but it doesn't appear to be disabled completely). Does anyone have a good list about what I can safely disable via adb?
 
Last edited:

exnokiafan

Senior Member
Aug 29, 2014
334
44
I cannot rule out the screen protector might affect input, but personally the impact on input sensitivity/precision with tempered glass ones is not that significant. With this tablet I do regularly clean the screen. Nowadays I also use such protectors on my phone, and I hardly ever had any touch-related issues directly caused by screen protectors.

On the other hand, a long time ago I had an iPad Pro which started developing similar symptoms (missed taps, interrupted holds). Back then I had a PET screen protector installed on it, and because of that I removed the protector later on, thinking that might be the culprit, but the symptoms were still there, so the screen protector was NOT the real issue.

And honestly my fingers can indeed be a bit rough with tablet and phones that it's necessary to install a protector, or it'll leave some permanent marks after prolonged use (that when I clean the screen, the areas that I swiped most frequent during gaming would be visible).

EDIT: Not sure when did the November update come out. My device is still on October update and as of now no new updates are available.

EDIT 2: Will update the OP a bit.

EDIT 3: I think some Samsung stuffs is indeed interfering (or at least taking up precious resources) as I did a logcat and noticed something mentioning Game Manager (which I do not want to activate, but it doesn't appear to be disabled completely). Does anyone have a good list about what I can safely disable via adb?

I can send you the list of what I have disabled on my Tab S4 with android 10. After many trials and errors nothing crashes. Well rules of survival crashes from time to time but I think it might be normal. I left the game mode. Feel free to get rid of it. I based my list on some galaxy S10 debloat threads if I remember correctly. There were some pretty detailed lists. Note that I'm not rooted. I have tried to root but there was more hassle than positive effects.
 
  • Like
Reactions: LSS4181

exnokiafan

Senior Member
Aug 29, 2014
334
44
Ok I got an S7 plus 8/256. The hardware is a beast but the touch screen shows the exact same problems of the non plus version I had tried some weeks ago.

While playing rules of survival, sometimes the left thumb that controls the movement loses the touch and the character gets stuck. Since I play with a pair of triggers, sometimes the left trigger gets irresponsive and my weapon cannot shoot steadily. The right portion of the screen seems to be less affected by this kind of problems. I should flip the tablet and test the opposite side. I am using a glass screen protector. It might be affecting the touch performance, but I'm not entirely sure, since it has been applied without any bubble.

The option to disable unwanted touches is obviously disabled. I did not touch any of the other options about the long press timing or the other one that I cannot remember now.

I have tried a screen testing app and I did not see any ghost touches or other issues.

This is getting annoying. I have 3 weeks before I cannot send it back to Amazon. I bought it on the German warehouse.
 

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
Hi All, I have the exact same problem... have you found any solution or Samsung helped you?
I've unlocked and rooted the device as I tried to look into the issue further so I can't really rely on Samsung anymore. I haven't really updated the thread since then as I've been busy and am trying to live on with the issue which I think it's just natural for touch screens to have issues and I really can't avoid such...

With Android 10 FW, the issue seems to be able to affect everywhere as I could witness them happening in home screen and in touch test apps. However, things become different with Android 11 that the issue seems to be constrained to the particular app/game and I could no longer reliably reproduce them outside, only in some rare cases.

Since the BUD2 upgrade, I noticed that the additional taps I used to have during swipe/flick actions mostly disappeared, indicating some form of mitigations. However, with BUD2 I had times where touchscreen stopped working almost completely. Nearly all taps were dropped during the period that I couldn't pause the game nor call out the navbar, until I held the power button that caused the game to lose focus (pausing it in the process), and then touchscreen works again. Either I have a faulty hardware, or at that particular moment there were no CPU cores handling the incoming touch inputs at all.

I'm still looking at what might be causing the issue, but the logcat is too bloated to read, and I still need time to understand the meaning of every line in the kernel dmesg I dumped while playing and experimenting.

In overall, the tablet's framerate is very unstable while playing. On games that limit themselves to 60fps regardless, the game feels janky despite the framerate shown on PerfMon stayed stable at 60. On the other hand, the same games looked very fluid on my SD845-powered Razer Phone 2. I'm starting to wonder, if SD845 is a perfect SOC1 example, and SD865+ being a perfect SOC2 example, for this testcase.

Although I have systemlessly removed GOS via Magisk, it doesn't seem to have it removed completely as there are some logcats coming from system_server mentioning about GOS (especially, a watchdog), just that it couldn't find the apk to reinstall/re-enable. Also, I noticed some kernel dmesg lines containing "Input Booster" talking about something like "Del Ib instance" and I wonder if it has anything to do with GOS (as GOS stuffs tend to call themselves Boosters, like Game Booster).

Still, I'm noticing something that might be affecting the system performance. One of the games I play on the tablet could normally manage to reach near 120fps in-game, but it falls to 30-40 fps ingame after the app loses focus (e.g. switching to home screen or to another app) for at least once. Setting Motion Smoothness to Standard (60Hz) in this case would only make matters worse as it further cut the framerate by half (that is, I have 30-40fps before setting to 60Hz, after that I only get about 10-20fps). It may be because of the game itself (that's based on Unity), but I'm not perfectly sure. For that particular game I need to force close it and run it again in order to make it able to reach 120fps in-game again.

I have used SmartPack to set the GPU on performance governor with power level set to 0, in order to actually keep it on 670MHz as otherwise it stayed on 305MHz most of the time which I suspected it might be the cause of the performance issues, but right now, I'm seeing little gain in video performance and I noticed that the GPU clock can still go down to 525MHz after a while, something which I don't think it should happen on performance governor.
 

riyahsahul

New member
May 17, 2021
1
0
Not sure what might be causing the issues. While not really an issue for normal use, but in some games it can be really frustrating to find it so difficult to full combo even on lower difficulty levels such as Easy because at least one tap would fail to register correctly in almost every play.

In my cases, the tablet mainly lags/stutters when it throttles due to overheat (if played for a prolonged amount of time). There's really no easy fix for that issue as it's very normal for such beefy SoCs to reach high temperatures.

Honestly, the tablet is too bloated in terms of touchscreen-related features (like S-Pen and palm gestures). Not sure if the touchscreen sensitivity was adjusted to make sure these features work without major issues, which in turn can cause some side effects that only gamers would find them annoying. The touchscreen is indeed oversensitive as some other people have reported, that touches sometimes get registered too easily to the point that it sometimes results in undesired touches, such as being too early (registered before the finger actually landed), or ghosted (a touch appeared as two or more).

Back then I got myself a Pixel C that I flashed with custom ROMs since day one and I never had any issues like this. Although it started developing similar symptoms later on, it turned out to be caused by a swollen battery and the issues went away after replacing it.

Unlike that time, for S7+ I hardly ever had the charger plugged (only when I turned it off and when the battery is really getting low), and there are also no apparent signs of a potential battery issue developing as far as I can see.

EDIT: I'm yet to be able to get another update... but it seems with prolonged gameplay the tablet may become very hot and the touchscreen becomes completely erratic in-game despite the game itself might not be stuttering (and sometimes this would cost me dearly).

I suspect when the SoC overheats the throttle impaired the system's touchscreen recognition and the reason why I'm not able to reproduce every issue outside games is that the tablet would not be as hot as when in-game due to reduced load. Guess I need to look for a way to keep the tablet cool while playing... Once again, it the nature for such beefy SoC to overheat over time.
 

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
The touchscreen went unresponsive today again and I noticed these in the kernel dmesg... Actually, similar dmesg entries happen all the time while the device is running, I just took something that looks relevant.

[ 708.540205] IRQ 5: no longer affine to CPU6 [ 708.561407] fts_touch 4-0049: [sec_input][P] tID:0.1680 z:23 major:16 minor:13 loc:C.C tc:1 type:0 p:0 nlvl:1 maxS:134 hid:0 [ 708.561538] set_freq_limit: id(1) freq(1401600) [ 708.561548] cpufreq_limit_get: touch min same values(1401600,0) entered. just return. [ 708.618420] fts_touch 4-0049: [sec_input][R] tID:0 loc:C.C dd:-7,1 mc:6 tc:0 p:0 nlvl:1 maxS:137 hid:0 [ 708.692113] set_freq_limit: id(1) freq(1401600) [ 708.692130] cpufreq_limit_get: touch min same values(1401600,0) entered. just return. [ 708.832303] [Input Booster] Release Timeout Func :::: 71's TV No Exist(1) [ 708.832380] [Input Booster] Release Timeout Func :::: 71's TV No Exist(3) [ 708.832399] set_freq_limit: id(1) freq(1401600) [ 708.832412] cpufreq_limit_get: touch min same values(1401600,0) entered. just return. [ 708.832479] [Input Booster] Del Ib Instance's Id : 71 [ 708.860192] IRQ 5: no longer affine to CPU7

I've set my CPU governors to ondemand and set a much higher minimum clock just because it tends to underclock, yet from the dmesg it's still trying to underclock to a value lower than that.

Also, I noticed several "Release Timeout Func" entries that seems to match the moments when touchscreen stopped responding to almost anything. Again, I don't know what this "Input Booster" really is. It's still hard to determine what exactly happened, though.
 
Last edited:

ahaznada

Member
Oct 30, 2010
37
6
Slavonski Brod
Tablet have some serious display problems.
I have sent mine already third time to repair and having same issue all the time.
First time they changed display on it, second time apparently couldn't find any issues. Now i send it third time and waiting to see what's going to happen.

 

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
Tablet have some serious display problems.
I have sent mine already third time to repair and having same issue all the time.
First time they changed display on it, second time apparently couldn't find any issues. Now i send it third time and waiting to see what's going to happen.

Just saw your video. It seems your issue is much worse and more consistent than the ones I'm having.

I don't know if the game engines can also be related, as one of my games uses Unity and the issues happened there most of the times. In other games the issues are less often but still present.

From the looks of it, despite its specs the tablet is not really meant to be used for serious gaming. The SOC might be good, but the touchscreen hardware certainly isn't.

I guess one is supposed to be using S-Pen most of the time for some office/production activities. From what I tested on GSI, S-Pen is considered a pointer device with significantly higher sampling rate. When testing using Touch Screen Benchmark app, with my finger I get 120 touch points per second, but with S-Pen I get about 360 touch points per second.

I'm not sure what Samsung might do to test/repair the touchscreen but I certainly can't ask them anymore, as my warranty is already void (0x1).
 

ahaznada

Member
Oct 30, 2010
37
6
Slavonski Brod
Just saw your video. It seems your issue is much worse and more consistent than the ones I'm having.

I don't know if the game engines can also be related, as one of my games uses Unity and the issues happened there most of the times. In other games the issues are less often but still present.

From the looks of it, despite its specs the tablet is not really meant to be used for serious gaming. The SOC might be good, but the touchscreen hardware certainly isn't.

I guess one is supposed to be using S-Pen most of the time for some office/production activities. From what I tested on GSI, S-Pen is considered a pointer device with significantly higher sampling rate. When testing using Touch Screen Benchmark app, with my finger I get 120 touch points per second, but with S-Pen I get about 360 touch points per second.

I'm not sure what Samsung might do to test/repair the touchscreen but I certainly can't ask them anymore, as my warranty is already void (0x1).
I have same issues on all apps not just games like internet browsers, play store even on home screen
 

LSS4181

Senior Member
Mar 13, 2012
406
132
Google Pixel C
Razer Phone 2
I have same issues on all apps not just games like internet browsers, play store even on home screen
On Android 10 I used to have similar situations that when it happens, I would still be affected by it even after switching out the game. On Android 11 it seems to mostly affect the particular game and would mostly go away when I switch back to home screen. I usually would test if the issue's still there in the Touchscreen Benchmark app, but in most cases I couldn't reproduce it there (mainly the Sensitivity test). Of at least 40 test attempts, I only managed to record actual interruptions once, plus a few actual delays (a few missed areas near the beginning).

On the other hand, actually Android does differentiate between touchscreen taps and "mouse" clicks. S-Pen taps are considered "left clicks" and would not work on games I play (just tested it and found out), although games usually do allow such "left clicks" to function in other places like menus. This is how it behaves in GSIs. Maybe it behaves differently in stock ROM but I didn't pay too much attention.

But in overall the tablet's touch response time is not stable. I get much more inconsistent numbers when calibrating touch timings in some games, compared to my phone and my old tablet, Pixel C.

Sadly the issues persist even after I switched to a GSI (it made no noticeable difference). I'm starting to wonder if there really is something wrong with the hardware, though I couldn't really find any really helpful info from logcats and kernel dmesgs that could point out the real cause. Again, RMA is not an option as my warranty has already been voided at this point.
 

seungbaekm

Member
Aug 24, 2011
25
4
Not sure that all S7+ have this issue or only a few people have this issue, but mine has that issue too.
I purchased the S7+ to use as a second monitor, so didn't notice earlier.
2 months later, I started playing a driving game. While playing the game, suddenly 3" whole left side touchscreen is not responding. After 1~2 seconds, it comes back to normal. And then suddenly it stops for 1~2 seconds and then comes back to normal, repeat.
I flipped the table and played the same game. Then, the right side is the problem. Yeah, as other people also have the issue on the left side, the S7+ really has an issue on the left side.

I installed a tempered glass screen protector and Poetic Revolution case. When I play 10 matches with the screen protector and case, the touch screen issue occurred 2~4 times. Without the screen protector and case, the touch screen issue occurred 0~2 times. Much better, but can't say it is normal.
When I play the same game using my Essential Phone[PH-1], it doesn't have the issue.

I purchased the S7+ three months ago, so claimed a warranty. Not sure Samsung can fix this issue or return without fixing it or fixed it but made more issues. Let's see.
 
  • Like
Reactions: LSS4181

Top Liked Posts

  • There are no posts matching your filters.
  • 1
    Not sure that all S7+ have this issue or only a few people have this issue, but mine has that issue too.
    I purchased the S7+ to use as a second monitor, so didn't notice earlier.
    2 months later, I started playing a driving game. While playing the game, suddenly 3" whole left side touchscreen is not responding. After 1~2 seconds, it comes back to normal. And then suddenly it stops for 1~2 seconds and then comes back to normal, repeat.
    I flipped the table and played the same game. Then, the right side is the problem. Yeah, as other people also have the issue on the left side, the S7+ really has an issue on the left side.

    I installed a tempered glass screen protector and Poetic Revolution case. When I play 10 matches with the screen protector and case, the touch screen issue occurred 2~4 times. Without the screen protector and case, the touch screen issue occurred 0~2 times. Much better, but can't say it is normal.
    When I play the same game using my Essential Phone[PH-1], it doesn't have the issue.

    I purchased the S7+ three months ago, so claimed a warranty. Not sure Samsung can fix this issue or return without fixing it or fixed it but made more issues. Let's see.
  • 1
    I've had similar issues with mine, during game play - it starts off fine, then the screen starts to lag and many missed inputs... Had an update yesterday, but haven't tried it yet

    Not sure what might be causing the issues. While not really an issue for normal use, but in some games it can be really frustrating to find it so difficult to full combo even on lower difficulty levels such as Easy because at least one tap would fail to register correctly in almost every play.

    In my cases, the tablet mainly lags/stutters when it throttles due to overheat (if played for a prolonged amount of time). There's really no easy fix for that issue as it's very normal for such beefy SoCs to reach high temperatures.

    Honestly, the tablet is too bloated in terms of touchscreen-related features (like S-Pen and palm gestures). Not sure if the touchscreen sensitivity was adjusted to make sure these features work without major issues, which in turn can cause some side effects that only gamers would find them annoying. The touchscreen is indeed oversensitive as some other people have reported, that touches sometimes get registered too easily to the point that it sometimes results in undesired touches, such as being too early (registered before the finger actually landed), or ghosted (a touch appeared as two or more).

    Back then I got myself a Pixel C that I flashed with custom ROMs since day one and I never had any issues like this. Although it started developing similar symptoms later on, it turned out to be caused by a swollen battery and the issues went away after replacing it.

    Unlike that time, for S7+ I hardly ever had the charger plugged (only when I turned it off and when the battery is really getting low), and there are also no apparent signs of a potential battery issue developing as far as I can see.

    EDIT: I'm yet to be able to get another update... but it seems with prolonged gameplay the tablet may become very hot and the touchscreen becomes completely erratic in-game despite the game itself might not be stuttering (and sometimes this would cost me dearly).

    I suspect when the SoC overheats the throttle impaired the system's touchscreen recognition and the reason why I'm not able to reproduce every issue outside games is that the tablet would not be as hot as when in-game due to reduced load. Guess I need to look for a way to keep the tablet cool while playing... Once again, it the nature for such beefy SoC to overheat over time.
    1
    I cannot rule out the screen protector might affect input, but personally the impact on input sensitivity/precision with tempered glass ones is not that significant. With this tablet I do regularly clean the screen. Nowadays I also use such protectors on my phone, and I hardly ever had any touch-related issues directly caused by screen protectors.

    On the other hand, a long time ago I had an iPad Pro which started developing similar symptoms (missed taps, interrupted holds). Back then I had a PET screen protector installed on it, and because of that I removed the protector later on, thinking that might be the culprit, but the symptoms were still there, so the screen protector was NOT the real issue.

    And honestly my fingers can indeed be a bit rough with tablet and phones that it's necessary to install a protector, or it'll leave some permanent marks after prolonged use (that when I clean the screen, the areas that I swiped most frequent during gaming would be visible).

    EDIT: Not sure when did the November update come out. My device is still on October update and as of now no new updates are available.

    EDIT 2: Will update the OP a bit.

    EDIT 3: I think some Samsung stuffs is indeed interfering (or at least taking up precious resources) as I did a logcat and noticed something mentioning Game Manager (which I do not want to activate, but it doesn't appear to be disabled completely). Does anyone have a good list about what I can safely disable via adb?

    I can send you the list of what I have disabled on my Tab S4 with android 10. After many trials and errors nothing crashes. Well rules of survival crashes from time to time but I think it might be normal. I left the game mode. Feel free to get rid of it. I based my list on some galaxy S10 debloat threads if I remember correctly. There were some pretty detailed lists. Note that I'm not rooted. I have tried to root but there was more hassle than positive effects.
    1
    Not sure that all S7+ have this issue or only a few people have this issue, but mine has that issue too.
    I purchased the S7+ to use as a second monitor, so didn't notice earlier.
    2 months later, I started playing a driving game. While playing the game, suddenly 3" whole left side touchscreen is not responding. After 1~2 seconds, it comes back to normal. And then suddenly it stops for 1~2 seconds and then comes back to normal, repeat.
    I flipped the table and played the same game. Then, the right side is the problem. Yeah, as other people also have the issue on the left side, the S7+ really has an issue on the left side.

    I installed a tempered glass screen protector and Poetic Revolution case. When I play 10 matches with the screen protector and case, the touch screen issue occurred 2~4 times. Without the screen protector and case, the touch screen issue occurred 0~2 times. Much better, but can't say it is normal.
    When I play the same game using my Essential Phone[PH-1], it doesn't have the issue.

    I purchased the S7+ three months ago, so claimed a warranty. Not sure Samsung can fix this issue or return without fixing it or fixed it but made more issues. Let's see.