I got nexus s (i9020T) recently and found the touch screen unresponsive sometimes. I've already tried several launchers(adw, lancherpro, go launcher ex), and it seems not launcher's problem. I've also tried to flash different ROMs, including CM-7rc2 and stock 2.3.3, and the problem remains.
Later I tried to bind Multi-touch Visualizer 2 to long pressing home button, and found the when screen is unresponsive, it can still detect press near edges very well, but not the center. While I press at the edge and drap across the center, it keeps tracking my finger correctly. In addition, Locking and unlocking the screen can solve the problem temporally.
I'm confused by the strange behavior, anyone experienced similar issue?
more info from test,
I connect my phone with adb, and tried to "cat /dev/input/event0"
The behavior confirms what I see in Multitouch Visualizor 2: the when the center of screen is unresponsive, nothing can be read from the device node.
I read the mxt224 touch screen controller doc, and it seems the chip features self-calibration, and thus I believe the "lock & unlock" will trigger the chip to tune it self in some way. I don't know kernel very well, so I cannot find the source code Any help please?
FYI. we are not alone.
http://code.google.com/p/android/issues/detail?id=13853
I got this problem too whenever my phone is in my pocket facing inward.
I have tried to open the calculator to see which part of the screen having problem. Mine is usually the "8" and "5" location unresponsive if my phone stayed in my pocket facing inwards for a certain period of time.
The problem will goes off after couple of mins when i can feel that the phone is cooler than my body temp.
I knew this happens to the Dell Streak as well.
Got my US TF700T couple of days ago. It seems that every few minutes or so it sporadically detects touch in the lower right corner.
It's not exactly the same spot - sometimes it's lower and opens notification bar, sometimes it's higher and usually results either on opening shortcut that is their or clicking on the link in browser. I could not find anything that would cause it.
It seems that someone else reported similar problem in Amazon review.
So does it sound like a defect that requires a return? Does anyone else have the same problem?
alexnoalex said:
Got my US TF700T couple of days ago. It seems that every few minutes or so it sporadically detects touch in the lower right corner.
It's not exactly the same spot - sometimes it's lower and opens notification bar, sometimes it's higher and usually results either on opening shortcut that is their or clicking on the link in browser. I could not find anything that would cause it.
It seems that someone else reported similar problem in Amazon review.
So does it sound like a defect that requires a return? Does anyone else have the same problem?
Click to expand...
Click to collapse
I've read about something like that on the tf300t forum if my memory doesn't trick me and that user used a multitouch testing app to caught the issue on video. If a factory restore doesn't solve the issue i would say that asking for a replacement unit is the best way.
Sent from my ASUS Transformer Pad TF700T using Tapatalk 2
i haven't had any "unintended touches" problems on the tablet* but i do sometimes have problems where in that lower right corner it's very hard to get it to register a touch. this seems to be a software problem thoug - as it comes and goes and a cold boot always fixes it (warm boot usually does). i'm hoping when i jump from 21 to 26 (or whatever it is when i have time to do it - auto-update not working, even after CM and DM cold-boot and process kills) it'll "go away".
IMPORTANT: if you experiment with touch sensitivity by bringing your finger close to the screen slowly you'll figure out how damn sensitive it is when you're even still a ways away from touching the glass. it MAY be the fact that your right thumb is creating those unintended sporadic touches. FYI/FWIW/YMMV.
Doody
* the touchpad on the dock/keyboard is HUGE prone to phantom touches - especially from my left thumb. i finally had to turn the touchpad off so i could use the keyboard!
MrDoody said:
i haven't had any "unintended touches" problems on the tablet* but i do sometimes have problems where in that lower right corner it's very hard to get it to register a touch. this seems to be a software problem thoug - as it comes and goes and a cold boot always fixes it (warm boot usually does). i'm hoping when i jump from 21 to 26 (or whatever it is when i have time to do it - auto-update not working, even after CM and DM cold-boot and process kills) it'll "go away".
IMPORTANT: if you experiment with touch sensitivity by bringing your finger close to the screen slowly you'll figure out how damn sensitive it is when you're even still a ways away from touching the glass. it MAY be the fact that your right thumb is creating those unintended sporadic touches. FYI/FWIW/YMMV.
Doody
* the touchpad on the dock/keyboard is HUGE prone to phantom touches - especially from my left thumb. i finally had to turn the touchpad off so i could use the keyboard!
Click to expand...
Click to collapse
I just upgraded to 26. It seems lot better. Watched a video for an hour and not a single sporadic touch. I actually enabled developer option to show screen touches. I don't see any excessive sensitivity. My issue was purely random and not related to fingers position. I will continue testing with 26 for few days to decide whether it worth keeping the tablet.
Hi, has anyone else had the center of their touchscreen stop responding? It has been intermittently happening for a couple of days, and I can't seem to pin it to anything I am doing or anything I have changed.
I attached a screen shot of the screen while scribbling in SketchBook to show how the center third of the screen is being skipped. To click anything in the center of the screen, I have to use the track pad on the keyboard.. Powering off and back on clears the issue, but it has come back several times. I hope this is not a hardware issue, what do you think?
Thanks!
BTW - This only happens while using the keyboard dock.
yeah when you close the tab, the keyboard holder presses on the screen too hard and creates a "ghost touch". On//off screen fixes it. as the hinge gets more loose it goes away. i went to developer setings and enabled visual feedback so could spot it.
It seems like when I pinch the rails together to reduce the slop and wiggle of the keyboard and tablet, the ghost spots stop for a few days. I got an AR Drone at Christmas and get nervous about flying it and losing control of the screen (crash and burn).
I had issues with my Asus TF700t that quite often it did not react on touch gestures.
And on the home screen the "change backround" dialog opened sometimes without any touch on the device.
This happend very very often when it was in the dock, but also without the dock (less occurence).
Now i know that the reason are ghost touches. By the usage of touch test apps (e.g. "Simple Touchscreen Tester" oder "Yet Another MultiTouch Test") i realized the ghost touches.
This touches are recognized always on the same coordinates. The multitouch test app detects 4 fingers on the same y-axis.
When the tab is in the dock and i open it completely to the maximum the two bolts from the dock are pressing very strong to the background of the screen glass. This is causing the ghost touches.
I opened the tab and tried to find what could be wrong (especially on the area where the touches are detected).
Anyhow i could not find anything. The only thing i noticed was the on the y-axis of the ghost touches the screen is fixed on the left and the right.
I check everything else closed the case ... but the ghost touches are still present.
Any idea how to fix the issue??? Who else realized the same issue???
Attached some screen shots from the touch test apps.
mr_cg said:
I had issues with my Asus TF700t that quite often it did not react on touch gestures.
And on the home screen the "change backround" dialog opened sometimes without any touch on the device.
This happend very very often when it was in the dock, but also without the dock (less occurence).
Now i know that the reason are ghost touches. By the usage of touch test apps (e.g. "Simple Touchscreen Tester" oder "Yet Another MultiTouch Test") i realized the ghost touches.
This touches are recognized always on the same coordinates. The multitouch test app detects 4 fingers on the same y-axis.
When the tab is in the dock and i open it completely to the maximum the two bolts from the dock are pressing very strong to the background of the screen glass. This is causing the ghost touches.
I opened the tab and tried to find what could be wrong (especially on the area where the touches are detected).
Anyhow i could not find anything. The only thing i noticed was the on the y-axis of the ghost touches the screen is fixed on the left and the right.
I check everything else closed the case ... but the ghost touches are still present.
Any idea how to fix the issue??? Who else realized the same issue???
Attached some screen shots from the touch test apps.
Click to expand...
Click to collapse
Sounds like you have a digitiser hardware issue to me. Had the same on my Surface RT. Only fix was to get it replaced.
Yeah, I just got mine back from warranty digitizer recalibration.
tapatalkin'
Another TF700T here that just returned from RMA with digitizer repair. Went very smoothly for me and I have a TF700T that again works extremely well.
Do they replace parts or just recalibration? Is it possible to so this myself?
I have unlocked bootloader and i do not know if they will repair it without any problem. Any experience on this?
Hi,
First, sorry for my english...
Second, I have same problem since saturday 24 august with my TF700T. Buy november 2012.
I tried to updated to android 4.2 But it didn't solve my pb.
I try "Multi Touch test" app and I observed same problem than mr_cg. Thanks for your good description "Ghost touch"
Ghost disappear when i unplug and re-plug dock, (some time two or three time) but just for some second ...
mr_cg said:
Do they replace parts or just re-calibration? Is it possible to so this myself?
Click to expand...
Click to collapse
I would like to do so myself.... because i don't want send my tablet to asus and waiting infinity... any idea?
mr_cg said:
I have unlocked bootloader and i do not know if they will repair it without any problem. Any experience on this?
Click to expand...
Click to collapse
If you are root, you can perhaps try this app:
ILITEK Touch Utility
or
(less chance i think, it did for S2,S3) TouchScreenTune
Me i am not root, but if it is working for you, perhaps i will try to be.
Thanks for your help
Termajik said:
If you are root, you can perhaps try this app:
ILITEK Touch Utility
or
(less chance i think, it did for S2,S3) TouchScreenTune
Click to expand...
Click to collapse
Thanks for the hint. I tried the apps, but both do not solve my issues.
ILITEK ... descriptions sounds good, but unfortunately not working (i get always "access denied" even i have root for sure).
TouchScreenTune ... Based on description it should be also good tool to reduce/improve situation with ghost touches. Anyhow ... it is not working with TF700t.
I am just thinking if i should open the case again???
If with root permissions you don't find solution ... I think i should call Asus support for my first RMA..
snif snif.
Thanks for your return. I win a lot of time.
Same issue
I'm having the same issue here, but only when docked. Seems like I'll stop using the dock since I am out of waranty because I unlocked the bootloader ...:S
I've been having a similar issue very badly on the right side of my screen, it was practically unusable. I am also out of warranty because I'm unlocked. What I did to make it at least somewhat usable was go into the build prop and change my max touch screen events from 200 to 4, and changed my touch sensitivity from .001 to 1 (this setting may have only been available on CROMI. Anyway, now my touchscreen doesn't work on the right side, however it does work everywhere else, and most importantly I can still use the tab as a laptop in its dock. It's a bumm it doesn't work right, but it's better than a total loss!
Sorry guys, it is a failed design problem due to connection to the touch screen. see my post in the "so i took it apart" thread.
Cost me a ruined lcd screen to figure it out
Ghost touches
mr_cg said:
I had issues with my Asus TF700t that quite often it did not react on touch gestures.
And on the home screen the "change backround" dialog opened sometimes without any touch on the device.
This happend very very often when it was in the dock, but also without the dock (less occurence).
Now i know that the reason are ghost touches. By the usage of touch test apps (e.g. "Simple Touchscreen Tester" oder "Yet Another MultiTouch Test") i realized the ghost touches.
This touches are recognized always on the same coordinates. The multitouch test app detects 4 fingers on the same y-axis.
When the tab is in the dock and i open it completely to the maximum the two bolts from the dock are pressing very strong to the background of the screen glass. This is causing the ghost touches.
I opened the tab and tried to find what could be wrong (especially on the area where the touches are detected).
Anyhow i could not find anything. The only thing i noticed was the on the y-axis of the ghost touches the screen is fixed on the left and the right.
I check everything else closed the case ... but the ghost touches are still present.
Any idea how to fix the issue??? Who else realized the same issue???
Attached some screen shots from the touch test apps.
Click to expand...
Click to collapse
What a great thread! Thanks, I've posted this elsewhere but having just send my TF700 back to ASUS I now have a pretty good idea of what might have been wrong with it. Here's what I posted and what I've told them anyway. I've overlooked the Ghost touches unfortunately, so I will let them know that (if they don't already)......any comments welcome...
Asus Transformer S/N D20KAS016975
I've struggled with this tablet since purchase in April this year, not being at all familiar with tablets I did not know whether it was just me, the general setup, or the tablet itself at fault. Most certainly the performance is not satisfactory. I have done three 'Factory Resets' and numerous Soft Resets.
Intermittently, the tablet will scroll and flash through various apps, when I open it. Originally File Manager would open itself up, then I got the feeling the Weather app would upset things. Sometimes a browser would make it do the same. Then I tried various Launchers, but the best of them (I think) sometimes shows the menu unannounced. Same thing, on and off until I intervene.
It is also prone to do this just sitting open by itself.
Clearing the caches sometimes fixes this. Sometimes this will stop by itself, other times I need to either close the lid, press the lock button, or turn it off. Then it will be OK.
At times Gmail will scroll randomly through the accounts, messages, labels etc.
Every browser I've tried will sometimes shut itself off, especially if I try to type something into a message box, usually when I've spent some time doing this!
Occasionally I can feel a slight tingling sensation when I'm lightly touching the back of the screen.
One other thing: When left overnight the mouse doesn't work and the tablet needs to be turned off and on again for the mouse to work. I also think the screen doesn't turn off sometimes (can see a light).
At other times the whole thing works just fine.
Hope this helps.
Regards
Grant
Tablet arrived back this morning
GrantCC said:
What a great thread! Thanks, I've posted this elsewhere but having just send my TF700 back to ASUS I now have a pretty good idea of what might have been wrong with it. Here's what I posted and what I've told them anyway. I've overlooked the Ghost touches unfortunately, so I will let them know that (if they don't already)......any comments welcome...
Asus Transformer S/N D20KAS016975
I've struggled with this tablet since purchase in April this year, not being at all familiar with tablets I did not know whether it was just me, the general setup, or the tablet itself at fault. Most certainly the performance is not satisfactory. I have done three 'Factory Resets' and numerous Soft Resets.
Intermittently, the tablet will scroll and flash through various apps, when I open it. Originally File Manager would open itself up, then I got the feeling the Weather app would upset things. Sometimes a browser would make it do the same. Then I tried various Launchers, but the best of them (I think) sometimes shows the menu unannounced. Same thing, on and off until I intervene.
It is also prone to do this just sitting open by itself.
Clearing the caches sometimes fixes this. Sometimes this will stop by itself, other times I need to either close the lid, press the lock button, or turn it off. Then it will be OK.
At times Gmail will scroll randomly through the accounts, messages, labels etc.
Every browser I've tried will sometimes shut itself off, especially if I try to type something into a message box, usually when I've spent some time doing this!
Occasionally I can feel a slight tingling sensation when I'm lightly touching the back of the screen.
One other thing: When left overnight the mouse doesn't work and the tablet needs to be turned off and on again for the mouse to work. I also think the screen doesn't turn off sometimes (can see a light).
At other times the whole thing works just fine.
Hope this helps.
Regards
Grant
Click to expand...
Click to collapse
Tablet arrived back this morning and seems all OK. Report indicates they replaced the LCD panel (new) & replaced the touch controller board (also new). And did various tests. Good service I think, no fuss. I'll let you know how it's going in a few days.
GrantCC said:
Tablet arrived back this morning and seems all OK. Report indicates they replaced the LCD panel (new) & replaced the touch controller board (also new). And did various tests. Good service I think, no fuss. I'll let you know how it's going in a few days.
Click to expand...
Click to collapse
Grant,
Was your tablet still under warranty? Did they charge anything? I wonder if they redesigned the digitizer connection or just put a new screen which will wear out as well. The digitizer connector runs along the bottom left of tablet screen. Same area is being pressed when you close dock, which wears it out.
You can go to developer settings and enable "show touches" (lowers tablet performance) then press on the bottom left edge of the screen, roughly 1/3 point of its length, and see if you get the ghosts to appear.
Warranty
dankens said:
Grant,
Was your tablet still under warranty? Did they charge anything? I wonder if they redesigned the digitizer connection or just put a new screen which will wear out as well. The digitizer connector runs along the bottom left of tablet screen. Same area is being pressed when you close dock, which wears it out.
You can go to developer settings and enable "show touches" (lowers tablet performance) then press on the bottom left edge of the screen, roughly 1/3 point of its length, and see if you get the ghosts to appear.
Click to expand...
Click to collapse
Yes, still under warranty (problem was there from day 1 although I didn't realise it at the time) and no charge. See attached pdf Customer report. Shows replacement Led panel, & controller board. No sign of ghost touches so far, and really working well actually. Early days yet, but I also note elsewhere in these forums someone mentioned their tablet not working properly 'upside down'. I neglected to mention it earlier but upside down isn't as funny as his respondents made out. I use mine often lying on the couch watching TV, with the tab upside down. Reason I mention it now is that mine acted up in those circumstances too. Anyway, that's fixed too.
So I recently dropped my phone (with a case) and a rock may have hit the screen directly. There is only a tiny, minor scratch on the top of the screen but the internal touch sensor on the bottom half seems to be messed up. Certain places of the screen will identify touches randomly to other places on the screen causing random swipes and taps when typing. I probably wouldn't be able to type this post on my phone without it tapping out of the keyboard or exiting chrome completely. I could barely swipe through developer tools without it randomly tapping the enable toggle countless times.
Now I know I probably can't fix this cause its a hardware issue but is there any way to make my experience any better for me until I can finally get an upgrade?
RIP, looks like it was just the crappy block I was using to charge the phone