Develop Bugs

[Q] Touchscreen gone mad @lockscreen

Hi!
Have anyone notised this problem with Z1C?
I received my Z1C 4 days ago and this has happened once every day. It seems to appear when trying to unlock the phone and all of a sudden it goes mad and nothing seems to happen when touching the screen. Otherwise the device seems to work fine. But do you guys think this is a software issue that can be fixed at next update or do you think I need to RMA?
regards.

This looks like a software issue to me... Try to factory reset your device and if it still persist reflash it with PC Companion it should fix the issue. A hardware defect can't make a phone like that don't worry
DXarz said:
Hi!
Have anyone notised this problem with Z1C?
I received my Z1C 4 days ago and this has happened once every day. It seems to appear when trying to unlock the phone and all of a sudden it goes mad and nothing seems to happen when touching the screen. Otherwise the device seems to work fine. But do you guys think this is a software issue that can be fixed at next update or do you think I need to RMA?
regards.
Click to expand...
Click to collapse

did it do that right out the box? or did you install anything that could have messed with that?

RevokOne said:
did it do that right out the box? or did you install anything that could have messed with that?
Click to expand...
Click to collapse
I cannot se anykind of app that I installed that would mess up the device like that? Ive installed about 15 apps and mostly "stand alone" apps like skype, sofascore and MX player. The app that closest could affect the UI is then maybe Nova launcher (got the prime verision) but I dont think it would mess up the lockscreen like that? (Or atleast it havent on any of my other devices, always felt solid and worked perfect)

It's not always about apps you installed though... There could be data files from system apps that got corrupted and caused the issue.

Do you have glove mode on at all? The screen is very sensitive, it could be some conductive dirt on the screen. I tested my Z1C in the shower, a drop of water rolling down the screen is enough to open the notification area or scroll a website in chrome.

Did you see this?
http://forum.xda-developers.com/showthread.php?t=2643078
I think this is a hardware issue.
This happens more often if you use some sort of flip case (I had roxfit).
Now I have only a screen protector with hardcase i have still lockscreen ghost touches but less.
To fix it just clean the display with cloths or something you prefer.
DXarz said:
Hi!
Have anyone notised this problem with Z1C?
I received my Z1C 4 days ago and this has happened once every day. It seems to appear when trying to unlock the phone and all of a sudden it goes mad and nothing seems to happen when touching the screen. Otherwise the device seems to work fine. But do you guys think this is a software issue that can be fixed at next update or do you think I need to RMA?
regards.
Click to expand...
Click to collapse

Okay, this is starting to be interesting. I actually did a factory reset three days ago and now this phenomenon haven't happened since before the reset. Though I must admit that Im not sure if I noticed the problem before mounting the Muvit Easy Folio case since I got the case the day after I got the phone. Unfortunately I have not had time to reinstall all apps that I had before the factory reset so for now my phone is not really comparable with the device it was three days ago. After the weekend I will probably know more since I will have had more time testing and installing all the former apps (then I can uncheck that variable). I hope its not the case since I have not found any other case that's lime and also cover the screen, though It also looks like a possible troublemaker (according to delimanyak23 and the thread)
time will show, I'll be back when Ive done some more research

This happened to me but in homescreen. I just turned off the screen. Wipe the screen with my tshirt for 2-3 secs and viola problem gone. Weird but it works
Sent from my D5503 using Tapatalk

My wife also has that issue. Her phone was factory reset but still the same and as it was seen by the shop who sold it to us, the phone will be replaced today. We will see if it happens with the new phone.
Nb : glove mode is off, no screen-protection used, a protectiln case is used but i don't know what model it is. I'll you the update after trsting the new phone.
Sent from my GT-I9506 using xda app-developers app

Crazy Touch Screen Not Responding Bugs with my G3

So most of us know about the System UI crash when using Chromecast, but this is even stranger. [Edit: an OTA update fixed this.] Some times, when I wake my phone up at the lockscreen or at times in the middle of a call - the touch screen stops responding. I can press and/or hold the volume buttons and there is a response on screen but I can not interact with the phone at that point. I can't continue to do battery pulls everytime. This is crazy. I'm on stock software. No crazy mods or anything. I've done a reset in the past and flashed the stock package again but this still happens every few hours. Only happens when the screen just wakes up...
Edit: This is a confirmed fix for me.
If you face the same issue, try:
open dialer
press 3845#* INSERT THREE DIGETS OF YOUR MODEL NUMBER THE PRESS #, for example, I am the F400K, so 3845#*400#
Hardware Device Test > Touch
update touch firmware
touch firmware version
wait 10 sec
reboot

I would say there is a misbehaving app causing the phone to lag in wake (that is all the unresponsiveness will be, extreme lag).
Sent from my Nexus 5 using Tapatalk

@Lennyuk - tried for over 30minutes after leaving it alone, I doubt it's a delay... Battery pulls work, but that's not the point.

deedscreen said:
@Lennyuk - tried for over 30minutes after leaving it alone, I doubt it's a delay... Battery pulls work, but that's not the point.
Click to expand...
Click to collapse
That was not his point.....to Find the app that is causing it go one by one uninstalling until you find it.... Something probably to do with app and the screen
Sent from my SM-N900P using Xparent BlueTapatalk 2

Epix4G said:
That was not his point.....to Find the app that is causing it go one by one uninstalling until you find it.... Something probably to do with app and the screen
Sent from my SM-N900P using Xparent BlueTapatalk 2
Click to expand...
Click to collapse
Totally agree with @Epix4G on this one. I am assuming you had a korean variant? The SK Telecom stock image is pretty ugly. Took me 3 debloat attempts before I had it behaving the way I wanted it to, but before I debloated, I had some lag issues (SK Telecom... grrrhhh).
Historically, Korean carriers (much like AT&T and Verizon) love putting useless junk on the phones for "productivity" but really they are there to charge Korean users more for other services, etc.
If you haven't done so, I would root and debloat, and see how big of a difference it makes (absolutely amazing performance after debloating on my F400S).

^^^^ - Will take that into consideration.
This may be a possible fix for now, can't yet confirm
open dialer
press 3845#* INSERT THREE DIGETS OF YOUR MODEL NUMBER THE PRESS #, for example, I am the F400K, so 3845#*400#
Hardware Device Test > Touch
update touch firmware
touch firmware version
wait 10 sec
reboot
It may or may not help
EDIT: It's been a few weeks and I haven't had this issue again. Usually every 4-6 hours it used to happen after powering on the screen, but so far so good.

Tried that with 855 version, it's not working. This is REALLY depressing as i just got a new phone and from day one i'm having this problem. I just can't believe LG screwed up like this, and there's no mention of this anywhere online other than this XDA thread. I hope i don't have to root and install custom rom as this really defeats the purpose of the phone.

@deedscreen
I'm having exactly the same problem on an 850 and tried your firmware method. The version number of the firmware did not change after reboot.
ic_fw_version info
SYnaptics 5.5
PanelType 1
version: v1.22
IC_product_id[PLG313]
Touch IC : s3528(family_id = 1, fw_rev = 1)
What version is your firmware? Also, did you find out about the fix from somewhere?

I have the F400K, but just got a US T-Mobile edition, (I'll eventually switch my signature). I would honestly suggest waiting for an OTA update. Call LG so they can document this. If that touchscreen update method doesn't work, I'm not sure what to do. I found the method somewhere online, I don't recall where exactly. If someone can figure out how to side load the touch screen firmware from a working Korean model to others, that would be great. For now, keep calling LG. It won't do much at first, but at least they'll have reports of this issue.
I have (RAW) touch screen firmware version: 30 05 51 96

Same problem, but not only on lock screen
Since 5 days I have my G3 (855 Modell). I was happy the first two days, then I discovered the problem, that the device is always unlocking itself, when in my front pocket. It's because of the Knock on feature. I deactivated this now.
But since yesterday i have the same issue: three times, i was unable to unlock my phone. The touchscreen simply did not respond. I had to remove battery. Today, I read this post and tried the firmware update of the touch, but I have the impression it did not change something in the version.
After this, today I had again once time the non responding touch while unlocking and shortly after, I had the issue after ending a phone call! The touch did no longer respond and had to remove the battery again!
I hope this is not a hardware issue, otherwise I will hurry up to the seller to exchange the phone, because its only 5 days old.

This is happening when the screen is on right? Or is the screen turning off and then not turning I again?

You need to keep Knock feature on, someone already said this. That's why your screen is freezing.

Daum Ex said:
You need to keep Knock feature on, someone already said this. That's why your screen is freezing.
Click to expand...
Click to collapse
Upps, yes, I just read this message now. To late: I was in the shop now and got mine exchanged. Anyway, that issue with the knock on feature should be solved also by LG: it's not acceptable, that the phone is always unlocking in my pocket.But then I wait with deactivating knock on for the moment.
So bad: such a good phone and such an annoying bug

icon71 said:
Upps, yes, I just read this message now. To late: I was in the shop now and got mine exchanged. Anyway, that issue with the knock on feature should be solved also by LG: it's not acceptable, that the phone is always unlocking in my pocket.But then I wait with deactivating knock on for the moment.
So bad: such a good phone and such an annoying bug
Click to expand...
Click to collapse
I sold mine after a few days, i was sick with it. I disabled the knock feature through the hidden menu only to have the screen freeze every day. What, i can't use the phone the way i like? I have to face the screen outwards in my pocket and risk damaging it? Screw that...
That, plus the overheating and horrible build quality (back got scratched in my pocket) was a deal breaker for me...

Daum Ex said:
I sold mine after a few days, i was sick with it. I disabled the knock feature through the hidden menu only to have the screen freeze every day. What, i can't use the phone the way i like? I have to face the screen outwards in my pocket and risk damaging it? Screw that...
That, plus the overheating and horrible build quality (back got scratched in my pocket) was a deal breaker for me...
Click to expand...
Click to collapse
Yes, indeed i also think about it. I got an official statement from support, regarding that the phone is unlocking all the time by itself in my pocket. They told me stuff like:
- this is a normal behaviour and can happen (!!)
- don't put your phone in the front pocket
- use the quick circle case to prevent...
- disable knock on (which is at least not possible over a standard setting, but only via the hidden menu).
I wrote back:
- that for me, this is not a normal behaviour
- that 90% of male users are wearing the phone in the front pocket
- that I don't like to buy a case only to prevent a bug of a premium telephone and
- finally, that they please could tell me, where and how to disable knock on
I am curious about their answer...

Good luck with that, disabling it through the settings doesn't change anything and they probably won't have a fix for months. They'll probably fix it though Android L update which will sadly come 6 months from official release at least.
Next time i purchase an Android phone i'm going with Nexus line...

icon71 said:
Since 5 days I have my G3 (855 Modell). I was happy the first two days, then I discovered the problem...
Click to expand...
Click to collapse
So what happened? How is it doing now?

Hey everyone, I just wanted to report my results of this touchscreen bug.
Well, I've only had my D851 for a week now. Of course I rooted it the same day I received it.
I had no touch issues until after restoring apps with Titanium Backup. I'd restore all user apps, then very few system app via XML. Since I just upgraded from a Galaxy S3 T999 I limited the system apps greatly. So much in fact that I only restored 1 system app......Media Storage 4.4.4 (Playlist). THAT WAS MY SCREEN KILLER!
The media scan on my D851 would render my screen unresponsive. I could only hold the power button and click power off or restart or whatever else was on that power menu. Then the phone would reboot after minutes of of a dead screen.
I flashed back to stock and reproduced the same issue. So now I've been running this device for 3 days without any screen lockups. I just have to rebuild my playlist again LOL.
I hope this helps someone here.

Knock
If you turn off the ability to wake by knocking the screen, it causes this issue where the screen locks. Turn it back on and the problem seems to go away.
I think LG really has to deal with this issue.

Hi guys, I have red a lot about this issue but I'm still confused with my LG G3 855.
First I realize problem with unlocking the phone using double click. Tried to upgrade touch software firmware using hidden menu and the screen became almost totally unresponsive. Tried to re-flash original 5.0 and 4.4.2, factory reset, battery removed, etc. but no luck.
I'm wonder if this is a software problem or became hardware. Should I consider replacing display or problem is in motherboard?
I really don't know what to do! Appreciate any comments or suggestions!!!
Thanks in advance!

[Q] Galaxy Nexus Sleep of Death

Problem: Cannot turn on the screen by pressing the power button sometimes. The screen is black or very dim, I cannot tell. One can see nothing on the screen, and it doesn’t accept any touch input, either. The phone still rings if there’s an incoming call. If this happens, the following several presses (about 10 - 20) on the power button will probably lead to a reboot. The “screen auto-rotate” and the proximity sensor may fail after the reboot, but will recover after a manual reboot.
Frequency: Fewer with higher Rom version. About once per day for 4.3.
Other description:
 The problem frequently happens when I just take the phone outside my house/office, and seldom happens when the phone just stays somewhere.
 The problem seems to be irrelevant to the remaining battery capacity or the uptime, but it never happens when charging.
 The problem seems to be irrelevant to the Apps installed.
 The problem seldom happens in the first 3-4 days after flashing a Rom, but happens more and more frequently as time goes by. My guess is some cache is stuffed by some trash, which causes the problem. The phone may be fine as long as the trash can be cleaned up on a regular basis.
 I manually reboot my phone at most every two days.
Solutions tried, but don’t work
 Flashing official ROMs 4.0.4, 4.1.1, 4.1.2, 4.2.2 and 4.3 following the procedure “adb reboot bootloader; fastboot oem unlock; flash-all; fastboot oem lock”, without google wallet, not rooted.
 Turning off the auto-brightness control, as suggested by some post on the Internet.

Does it look like it goes to standby normally or does the screen show gibberish and then turns off?
Sent from my Galaxy Nexus using XDA Free mobile app

Thymo said:
Does it look like it goes to standby normally or does the screen show gibberish and then turns off?
Sent from my Galaxy Nexus using XDA Free mobile app
Click to expand...
Click to collapse
Thank you very much.
I think it's standing-by normally even through the screen is black (or very dim, I cannot tell), since it rings if there's an incoming call. I can see nothing from the screen, and I don't think the screen accepts any touch input, either.
Does this answer your question? Thank you.

Bobby_yan said:
Thank you very much.
I think it's standing-by normally even through the screen is black (or very dim, I cannot tell), since it rings if there's an incoming call. I can see nothing from the screen, and I don't think the screen accepts any touch input, either.
Does this answer your question? Thank you.
Click to expand...
Click to collapse
Thanks.
Was just asking if you had gibberish yes or no. In that case i've got a different issue than you (Suspecting f*cked GPU).
Have you tried a different ROM/Kernel combination maybe it's related to that.

Thymo said:
Thanks.
Was just asking if you had gibberish yes or no. In that case i've got a different issue than you (Suspecting f*cked GPU).
Have you tried a different ROM/Kernel combination maybe it's related to that.
Click to expand...
Click to collapse
No.
No, I just tried the official ROMs. Any suggestion?

Perhaps it's just busy in the background and running low on RAM. Give LagFix a try. Sorry can't link atm as I am on mobile...

eKeith said:
Perhaps it's just busy in the background and running low on RAM. Give LagFix a try. Sorry can't link atm as I am on mobile...
Click to expand...
Click to collapse
Thanks a lot. I'm trying it.

Bobby_yan said:
Thanks a lot. I'm trying it.
Click to expand...
Click to collapse
LagFix does NOT help in my case. Any other suggestions? Thanks.

I've also had this blank screen with calls still ring issue for as long as I can remember, nearly 2.5 yrs.
I've always suspected it's my ROM and so I'd try out another ROM'S, BUT no other ROM works like how I'd like, so I always come back to my ROM.
It doesn't happen every single day, but it does happen very often.
I've tried using apps that auto reboot daily, but eventually this blank screen issue will return.
Unfortunately I can't seem to find any solution, so I just put up with it, it's like the 1 only flaw with my ROM.
&
Not to be at all rude, but I'm really glad op has had this issue from testing other versions of Android, cause then at least I know I don't need to give up my great tablet mode ROM.
LOL

I think I've finally found a work around for this screen of death.
Using Exposed, download/install this module/extension:
Disable Proximity
http://repo.xposed.info/module/com.mrchandler.disableprox
It does exactly what it's name is and ever since then I've not once had to remove my GN battery to work again because the screen went completely dead.

NVM
Screen still goes dead.
Anyone find an actual fix to this?

isajoo,
I had pretty much the same problems with my Galaxy Nexus running CyanogenMod 11 M12.
It got better by doing the following :
Blowing dry air in the earpiece… though the proximity sensor is clearly beside it. Can't do any harm though, I guess.
Settings/Applications/All/menu/Reset applications preferences (or whatever that's called in english) : that seemed to do a lot of good to my phone ! However, it's a very unsatisfactory answer on a technical point of view, as I still don't know WHAT was precisely needed. It's a "magic wand" solution for which I can't give an explanation.
Not specifically related, but greatly helped my phone in the responsiveness area : Trimmer (fstrim) (https://play.google.com/store/apps/details?id=com.fifthelement.trimmer), an updated version of LagFix that you may already know
Hope that helped !
(I wanted to try http://www.androidlegend.com/how-to-perform-proximity-sensor-calibration-on-any-samsung-phone/ as well, but apparently, /sys/class/sensors/proximity_sensor/prox_cal does not exist on my phone…)

LG G4 Touch Screen issues. Ghost Touches?

I've been able to replicate this issue on my G4 (815T Australian model) on a daily basis, just on the instagram app though.
I recorded a video of it. Slowmo part shows the issue
https://goo.gl/photos/F823e125PQckCPLp6
The screen seems confused and it just scrolls the other way even if my thumb wasn't touching the screen.
Factory data reset did not fix anything.
Are you able to replicate this LG G4 owners?

I don't use Instagram, so can't help with that app, sorry.
But if you go into Developer Options, and turn on "Show touch data", it might help add some more info to the discussion. It will show a trace on the screen of what the phone's touchscreen interpreted from your last tap/swipe.
It would presumably show a swipe up, and then back down, when you're getting these ghost touches that change the scroll direction. But perhaps it could also help show if swipes are interpreted the same way in other apps. It might help you learn a little more about what the phone is seeing, at least.

Thanks for the video and everything but why a new thread? Plenty of videos on the main thread.
Is another thread really necessary?
Sent from my LG-H811 using Tapatalk

Might be, because this only happens with IG. I've got the exact same problem, only with IG and its very annoying.

shook187 said:
Thanks for the video and everything but why a new thread? Plenty of videos on the main thread.
Is another thread really necessary?
Click to expand...
Click to collapse
Apologies, first time I posted it I was thinking it was just Instagram-specific.

KL643 said:
Might be, because this only happens with IG. I've got the exact same problem, only with IG and its very annoying.
Click to expand...
Click to collapse
Ahh good to know I'm not alone on this!

chobie said:
Apologies, first time I posted it I was thinking it was just Instagram-specific.
Click to expand...
Click to collapse
To me it looks like it is IG specific because I don't have this problem with any other app

You can try to change the touch feedback time from short to medium under settings/accessibility/motor & cogination. This will reduce the touch feedback time. Give it a try, and see if it gets better.
Sent from my iPad using Tapatalk

alanchai said:
You can try to change the touch feedback time from short to medium under settings/accessibility/motor & cogination. This will reduce the touch feedback time. Give it a try, and see if it gets better.
Sent from my iPad using Tapatalk
Click to expand...
Click to collapse
Done that but it doesn't solve this problem.

chobie said:
I've been able to replicate this issue on my G4 (815T Australian model) on a daily basis, just on the instagram app though.
I recorded a video of it. Slowmo part shows the issue
https://goo.gl/photos/F823e125PQckCPLp6
The screen seems confused and it just scrolls the other way even if my thumb wasn't touching the screen.
Factory data reset did not fix anything.
Are you able to replicate this LG G4 owners?
Click to expand...
Click to collapse
Question, do you have Google keyboard installed? Because I just removed Google keyboard and installed SwiftKey and it looks like the problem is gone....

KL643 said:
Question, do you have Google keyboard installed? Because I just removed Google keyboard and installed SwiftKey and it looks like the problem is gone....
Click to expand...
Click to collapse
Nope, I use Swiftkey from the beginning. Only LG stock keyboard is installed.

Mm, I've got LG keyboard freezed with TB and after changing from Google keyboard to SK, the problem is gone

KL643 said:
Mm, I've got LG keyboard freezed with TB and after changing from Google keyboard to SK, the problem is gone
Click to expand...
Click to collapse
Interesting. Not keen on rooting though. =\
So you reckon it's just a software issue?

chobie said:
Interesting. Not keen on rooting though. =\
So you reckon it's just a software issue?
Click to expand...
Click to collapse
Well this problem is only related to the LG G4 and IG for me...I don't have any other touchscreen problems with this phone. So for me I guess this is not hardware related. During the day I just had 2 small "ghost touches", way better than before. Will see how it goes the next few days...
Edit :
after a view days, it looks like it didn't solve this issue. Today I notice the ghost touches were there again in IG

Force GPU rendening under Developer options somewhat helped.
The new v10f on my Australian G4 didn't fix the issue as well.

Any updates on this? I had same issue. N this is a replacement unit after 2.5 weeks of waiting
Just day one and this ghost touch come up.

I also have this problem
Did you solve the problem?

I am facing similar issue.between...i am not using ig.

I've had this issue as well (not just IG) and sent the phone back for servicing. It was sent back to me with a report showing that they'd done a few things but the problem is still there. I'd been thinking I'd send it back in once more and ask them to have another look. I'm getting ghost touches everywhere and quite a bit, it's very annoying.
Someone mentioned there was another, large thread about this issue but I can't seem to find it, can anyone point me to it?

Hi, I posted this in a new thread yesterday as I couldn't find anything. Never thought to search for 'ghost taps' duh.
Every now and then when just doing normal things on the my phone it totally freaks out and all by it self it suddenly starts to tap random parts of the desktop, slides the pages, opens apps, closes apps, goes into calculator and a bunch of buttons are pressed randomly. It's almost like someone has hacked my phone and is trolling me by just tapping randomly on the phone.
Just today when looking at Facebook it closed the app, scrolled down notifications, data was turned off and wifi turned on.
I thought it might have been my screeen protector, bit of moisture in it or something. Took that off and still does it. Took out the battery for a minute and still does it.
It happened a few months ago then nothing for ages and now it's started again this weekend.
Thought it might have been only when connected to data but has now done it when offline.
Any one got a solution? Does a custom rom fix?

Ambient Display Screen Flashes

Hi Guys!~
Hope all is well !!
... recently I came across my rooted android 11 Pixel 3XL got a screen flashes with bright home screen background during the screen turning off and entering ambient display mode.
I try my best to find a solution but haven't found one yet.
I have tried to reflash to stock, also doesn't fix the problems.
... the only solution I found at this moment is to get android 12 beta which the transition animation from turning off the screen to the wake up of ambient display is totally different and I still prefer to stay with rooted android 11.
Your browser is not able to display this video.

Sounds like a hardware failure, display or mobo.

blackhawk said:
Sounds like a hardware failure, display or mobo.
Click to expand...
Click to collapse
It only happens when the screen turning off from home screen or app.
Trying to shoot a vid to show the issue now.

haritvii said:
It only happens when the screen turning off from home screen or app.
Trying to shoot a vid to show the issue now.
Click to expand...
Click to collapse
If you tried multiple roms especially the stock* one unless it's something you loaded after the flash, it's got to be hardware related. It's possible the non stock rom blew out some hardware too.
Try setting brightness to manual.
A rework around may be the only viable solution.
You ever wonder what happens when one or two of the billions of semiconductor junctions/resistors/caps fails in the chipset or display? You might be looking at an example
It could be a loose connection, or a faulty ribbon cable/connector, a subassembly maybe even battery (if so there be more symptoms).
*unless a known issue in this device.

blackhawk said:
Sounds like a hardware failure, display or mobo.
Click to expand...
Click to collapse

blackhawk said:
If you tried multiple roms especially the stock* one unless it's something you loaded after the flash, it's got to be hardware related. It's possible the non stock rom blew out some hardware too.
Try setting brightness to manual.
A rework around may be the only viable solution.
You ever wonder what happens when one or two of the billions of semiconductor junctions/resistors/caps fails in the chipset or display? You might be looking at an example
It could be a loose connection, or a faulty ribbon cable/connector, a subassembly maybe even battery (if so there be more symptoms).
*unless a known issue in this device.
Click to expand...
Click to collapse
Thank you so much, now I got a great reason to get a new Pixel 6 then

haritvii said:
Thank you so much, now I got a great reason to get a new Pixel 6 then
Click to expand...
Click to collapse
I could be wrong... and even if it is hardware that doesn't mean a work around doesn't exist to make it usable.
Play with it, Androids wuv attention