yashsingh1/xdaforums huggingface dataset:
[Nexus 7 General] mi7chy:
It's clear now we're discussing two different issues:

Issue #1) Random character 180-flip in Madfinger games such as Dead Trigger and Shadowgun. This issue occurs if you're holding the Nexus 7 or not and is most likely a software issue within the game. I see this issue when I'm holding it and plugged into the charger.

Issue #2) What appears to be a grounding issue but may be the nature of how capacitive touchscreen works. It won't appear if the Nexus 7 is grounded such as connected to charger, laying on a conductive surface such as stone tile floor, held in your hand, etc.

It will appear if laying on a non-conductive surface such as on top of the box it came in, wood desk, etc. and is independent of angle. Really easy way to replicate this issue is to open up the browser, go to cnn.com, zoom in all the way, then with the fat portion of one finger touch and hold down anywhere on the screen while making sure you're not touching the phone with the other hand. Shortly you will see the browser jump around, zoom in/out, etc.

One thing that makes it appear it's correctable via software is if you repeat the test using only the small portion of your fingertip instead of the fat portion input registers correctly and doesn't go haywire. Perhaps as a fix they can sample a smaller portion of the touch input. I believe HTC Sensation had a similar issue in the past and it was fixed through an OTA update.
[Nexus 7 General] bloodydamnhell:
My 16GB will do up to 9 touches without glitching on a flat non-conductive surface. With 10 fingers, axis crossing causes one (or more, on occasion) of the touches to stop registering momentarily.
[Nexus 7 General] bongostl:
Hey all

I talked to Google today to do an rma, and i was told that this is now a known problem, that it is a HARDWARE problem, and that it only effected a certain run of units.

They said anyone with the problem should call and rma.
[Nexus 7 General] mi7chy:
Doesn't sound correct. It seems like it's oversensitive because if I use my small fingertip versus the fat flat portion it works fine. They just probably need to push out an update to make it less sensitive.
[Nexus 7 General] IPvFletch:
Who did you talk to at Google, how did you contact them? I want to see if they'll RMA mine, even though IMHO it seems Ok.. Thanks!

Edit: found this: http://xdaforums.com/showthread.php?t=1796492
[Nexus 7 General] mi7chy:
Btw, no need to download the touch app as it's built-in. Go into Settings, turn on Developer Options and check both Show touches and Pointer location.
[Nexus 7 General] FiveOhFour:
Happens for me as well, i had tried it last night and the issue didnt present at all, after trying it tonight on a flat surface it was there but not to the degree of the OP. and fooling around with its placement and its orientation axis can either make it better or worse, but its definately there. Will spend more time trying to figure it out at some point
[Nexus 7 General] iamgeef:
The only issue I seem to get is with the controls in dead trigger. If I'm moving with my left thumb and then quickly release my left thumb and go to fire with my right thumb instead of firing it'll 'move' the left controls to under my right thumb. (make sense?!)

I was able to replicate the touch jittering when I got to 7/8 touches on the screen. Then it went a bit weird. But I can't even see myself needing to use that many fingers at the same time so I doubt I'll bother to RMA it as I've not got any other issues....for now
[Nexus 7 General] lin013190:
That happens to me. I got a RMA replacement coming in this Friday because of my lifted left screen, I'll see if it happens with replacement.
[Nexus 7 General] njfkdzxfm:
what a pity, in china, we can not watch the youtube...........:crying:
[Nexus 7 General] jaroslavj:
[YOUTUBE]tG6jsZCFvHM[/YOUTUBE]

If it's on the table I get this paranoid behaviour, but if I hold in my hands on put it on my lap it works fine.
[Nexus 7 General] jsgiv:
http://xdaforums.com/showthread.php?t=847827

Though an entirely different device - I remember this same "type" of behavior (touchscreen becomes erratic/unresponsive when not held - see thread link above) happening on my Samsung Focus.

IIRC it was fixed later with a firmware release/update.
[Nexus 7 General] mi7chy:
Try it again but use the small tip of your fingers instead of the fat part. It works fine for me that way so I think the touch settings are just overly sensitive and need to be dialed back with the next OTA update.
[Nexus 7 General] jaroslavj:
Yeah If you touch it very lightly only with the tips it's fine :) But the second I apply a bit more pressure it goes nuts.

---------- Post added at 04:17 PM ---------- Previous post was at 03:41 PM ----------

Quick thing I recently noticed. While lightly touching it doesn't produce the bug(while on the table) if you add a third point it starts again.

So if you have more than 2 points on a singles axis it goes wild.
[Nexus 7 General] AZImmortal:
That's what she said. J/k. :p
[Nexus 7 General] jaroslavj:
DEAD TRIGGER WAS JUST UPDATED.

Bug fixing:

Not working controls(180 turns).

The issues of multi-touch is now officially debunked. Happy gaming. :)
[Nexus 7 General] AZImmortal:
That might fix the 180 Dead Trigger issue but there are clearly multi touch issues outside of Dead Trigger as shown by the testing apps.
[Nexus 7 General] Draje0:
EDIT: Apparently the issue disappears when plugged in. The below fix actually did nothing. I guess we are back it being a grounding issue.

I too have this issue. However, I resolved it by editing a value in /system/usr/idc/elan-touchscreen.idc

You want to change this value:

touch.pressure.scale = 0.0048

To this:

touch.pressure.scale = 0.0028

---------- Post added at 08:07 PM ---------- Previous post was at 07:39 PM ----------

It appears Dead Trigger is using some sort of predictive correcting method. When the option in developer options to show pointer location is enabled, the touches can still be seen glitching in-game, albeit without the 180 turns.
[Nexus 7 General] mi7chy:
I can confirm the 180-degree control glitch is fixed in Dead Trigger. Just wasted a good hour enjoying it. They just need to do the same for Shadowgun THD.
[Nexus 7 General] MindlessAutomata:
Definitely a grounding issue. Touch your headphone jack while overlapping axes and the touch detection ceases. I doubt this can be fixed with with a software update and suspect we will need to RMA our devices. I would recommend waiting two months due to Google's current difficulties in providing a solid product.
[Nexus 7 General] FiveOhFour:
Yup wow I can confirm that too, crazy. If I am sitting in my bed and have the tablet flat on a pillow then the MT issue is obvious and rampant, ceasing when I touch the headphone jack, if I have it laying on top of my macbook for instance then it doesn't occur at all to begin with.
[Nexus 7 General] Phoenix84118:
Wow, I can also confirm. At first I only noticed problems with more than 3 fingers. However I went slower today and was able to trigger it with just 2; touching the headphone jack did fix it (with at least 6 finger touch).
[Nexus 7 General] jordanmw:
Got the same issue here, appears I can trigger it with multitouch tester and 3 fingers on the center of the device in a line horizontally when holding in portrait. When touching the audio jack, the touch sensor registers properly. Can anyone who has already done rma to see if the new ones still have this so we can find out if RMA even helps this?!?!?
[Nexus 7 General] GrkEngineer:
I have the same issue. Think it's a grounding issue that manifests when you cross axis between two touch points. Very likely in games like Dead Trigger and Mass Effect and Dead Space. I was able to recreate the issue in multi touch tester apps. If I touch the headphone jack it works fine. Also doesn't happen for me if I have headphones in.

Try playing the games with headphones to see if it's better behaved. Called in a RMA last night. Really hope the next device doesn't have this issue.
[Nexus 7 General] colonel187:
Mine doesn't have this issue
[Nexus 7 General] gedster314:
I tried mine held and on a table and it works fine no issues. I am running the Paranoid ROM based on CM10.
[Nexus 7 General] saadi703:
It happens on certain kind of materials. Try your bed with bed sheet on. My nexus works fine everywhere except when laying flat on bed. It works fine on table, on floor, on carpet. Not a big deal for me as I use it in my hands and it works great that way.
[Nexus 7 General] PROlific666:
If it happens when the device is your hands then I would say that is a problem. I can only get it to do this when it is laying flat which is a non issue since I will never play a multi touch game without my hands on the device. The bad ground theory sounds like it may have some validity to it since it only happens when the user isn't holding it... many phones have this same problem it isn't specific to the n7. If this occurs when you are holding the device in your hands then yes a RMA is in order. Also the 180 glitch happened on all devices not just the nexus 7.
[Nexus 7 General] GrkEngineer:
I made a video of the issue I'm experiencing along with how it behaves when I have the headphones plugged in.

https://www.youtube.com/watch?v=dG3-vjFYh0Q&feature=youtube_gdata_player
[Nexus 7 General] saadi703:
Yes I know the problem goes away when head phones or charger is plugged in. Also I don't face this issue on floor or carpet or on the top of my iPad 3 cover. I think if I get similar belken cover for nexus 7 then I won't face this problem laying flat on bad. In hands it works flawless.
[Nexus 7 General] jaroslavj:
It drives me insane that we don't have a reliable confirmation if this is a software issue(like with galaxy nexus, that was supposedly fixed with 4.0.4) or a hardware issue and we should all RMA it before 15 days window ;(
[Nexus 7 General] Draje0:
Same issue on my replacement Nexus 7. This time I'm returning for a refund. Does anyone have one that works perfectly fine on any surface?
[Nexus 7 General] AZImmortal:
The fact that things change depending on whether or not the device is grounded means that it's definitely a hardware issue, but whether it can be mitigated with a software update remains to be seen.
[Nexus 7 General] nawoa:
[deleted]
[Nexus 7 General] Draje0:
Mine would act up regardless of it's angle.
[Nexus 7 General] bongostl:
Google has Confirmed that this is a HARDWARE problem. They recommend rmaing it.

However, if you want to fix it, this has worked on two n7s that have the problem that I own:

The problem seems to be that the screws are a little too long.

Take off the back, and unscrew every screw by a quarter to a half of a turn. You should notice a difference immediately. I know that I did.
[Nexus 7 General] saadi703:
The 180 turn was the issue with the game not because of this issue. This issue only occurs when laying flat and who play games like that? Do you play dead trigger while your tablet is laying flat on floor or bed or table. I think everyone play games while holding the tablet and once you hold the tablet the issue is gone.
[Nexus 7 General] saadi703:
I have tried that previously but it didn't work.
[Nexus 7 General] nawoa:
I was wrong earlier, it definitively has nothing to do with the angle. I made a video, I'm going to post it on YouTube when I'm done editing it. I'm fairly confident it's a software bug.
[Nexus 7 General] saadi703:
Can you please provide the link where Google said that. I know it is a hardware problem but I want to see what Google has said about it,
[Nexus 7 General] bongostl:
No link. W

I was told that by a senior supervisor when I called to rma mine.
[Nexus 7 General] saadi703:
What about your new one? Is it fine?
[Nexus 7 General] bongostl:
Works great
[Nexus 7 General] saadi703:
Should I send email to Google about RMA?
[Nexus 7 General] x4sper:
i loosened my screws a little less than 1/4 turn about where it was before i did the "first" screen seperation fix. now the touch is working great... WTF

EDIT: nevermind its messed up.. DAMINT wasted a XOskin now son of a .. soo dissappointed
[Nexus 7 General] saadi703:
Yes, this is what I was going to say that this would not fix it and I have tried this earlier. It is not the screws but some grounding issue and touch issues appears if you are not touching or holding the device. It looks like that Nexus 7 freaks out when you stop touching it or holding it :D

---------- Post added at 01:31 PM ---------- Previous post was at 01:27 PM ----------

I have sent email to Google about the problems I am facing and I have asked for replacement. Let see what happens further i.e. whether I get the replacement or not and how good the replacement is.

The problem is that I have removed the back foam from my device and I don't know whether it would be a show stopper or not. Nowhere it warns that warranty would be voided if device was opened or the foam was removed however they might say that the device was tampered. I removed the foam to fix the screen lifting issue.
[Nexus 7 General] jaroslavj:
Did you get a reply from Google?
[Nexus 7 General] bongostl:
Don't be a fool... Just call them and be done with it!

85583nexus
[Nexus 7 General] saadi703:
Not yet.
[Nexus 7 General] saadi703:
Yes I am waiting for the funds to transfer in my account. Once done, I would definitely call them.
[Nexus 7 General] GrkEngineer:
I just got a replacement with the same issue.
[Nexus 7 General] redmonke255:
I bet this is pretty widespread. In fact even my phone has it.

Putting headphones in seems to fix it.
[Nexus 7 General] Draje0:
Went to Staples and, for the third time, bought a Nexus 7. This time I picked up an 8gb. It too is plagued with the same issue. I'm officially done with the Nexus 7.
[Nexus 7 General] dilldoe:
OK THIS IS JUST USER ERROR!!!!

THERE IS NOTHING WRONG WITH YOUR MULTITOUCH.

I've tried it and YES I can replicated the same issue.

Landscape mode on top of a flat surface, crossing path cancel out.

BUT TRY THIS!

Do the same thing, but on top of your nexus 7 box (box vertical, nexus 7 horizontal so it forms a cross)

Yeah the path cancel out once they cross. NOW using your middle, ring finger or thumb, touch the back bottom (where the speakers are) of the nexus and repeat the test.

I bet you can replicated the error now.

It might be a grounding issue, seeing how the lower back cover could act as a grounding plate (just a guess)

edit: just discover a video which PROVES my point

http://www.youtube.com/watch?v=E5VZekYIK7g

Same issue as laying it on flat surface
[Nexus 7 General] alan77ss:
So how is this actually adversely affecting people's use of the tablet? I can recreate this issue in the test app but have yet to find an app or game where this actually becomes a problem. The only issue I had was dead trigger and the devs pushed out an update which fixed it. Can people post some examples (outside of the test app) where it becomes a problem?
[Nexus 7 General] dilldoe:
read mine's above.

Since you need to touch the back for multitouch to work right, any case that covers the back and not 'conductive' will have this issue.

It's really not a huge issue and it's not defective, that's just how it's made.
[Nexus 7 General] jaroslavj:
THIS IS A DEFECT!

Lets say I want to use my nexus 7 as a midi controller with Ableton Live it will lay on its back and will have this bug which will make it completely unusable....
[Nexus 7 General] alan77ss:
Yeah I kind of of agree, not a big deal, unless you're using midi controllers on a flat surface, then it would be a pain.
[Nexus 7 General] dilldoe:
It's not a defect, it's just the way it's design.

That like saying my left speaker isn't working, when I only plugged in the right speaker.

This only occur if you isolate the back. Place it on the floor or rug, and you won't see this issue.
[Nexus 7 General] Pete7ate:
The only issue I seem to get is with the controls in dead trigger.
[Nexus 7 General] dilldoe:
I get that sometimes too, but I just think it's cause they have a crappy control setup
[Nexus 7 General] jaroslavj:
Sorry but I'm not into this whole Apple bull**** of you are holding it wrong....
[Nexus 7 General] x4sper:
Soo your saying if I take the nexus 7 out of the case and hold it... it will work right with no touch issues??

Sent from my Galaxy Nexus using Xparent Cyan Tapatalk 2
[Nexus 7 General] Draje0:
Unlike the speakers which comes with a manual telling the user to plug in the speakers, I was not informed that this device must be held in a grounding fashion for it to work correctly.

It is a hardware design FLAW.
[Nexus 7 General] x4sper:
Does this happen with everyone's nexus 7s?? So we can't use cases? Is it defective?

Sent from my Galaxy Nexus using Xparent Cyan Tapatalk 2
[Nexus 7 General] icemasta31:
Still on the fence on what the general consensus is if it's either a hardware defect or software?

I tried both my Galaxy Nexus and Nexus 7 flat on my bed and only the Nexus 7 had this issue. However as others said, laid flat but touching the headphone port, I can't replicate the issue so it's definitely a grounding issue I assume.
[Nexus 7 General] regalpimpin:
When I got my Evo 4g 2 years ago if you had it laying on a surface. Ungrounded. The whole top third of the screen was totally unresponsive. To any touch. As soon as you pick it up, works fine.

A software update fixed this.
[Nexus 7 General] dilldoe:
that's like saying it doesn't work when I wear gloves, it's a design flaw. the unit is not defective, it's a HANDHELD device.
[Nexus 7 General] Draje0:
Nowhere did I see "handheld-only" in the instructions or Play Store. The types of touchscreens commonly found in tablets and phones cannot work with gloves due to an overbearing technological limitation. However, plenty of tabets have no issues with mulitouch when used in similar fashions.

If it is by designed to have multitouch fail when placed in situations like those tested in this thread, it is not the tablet for me. This would definitely cause problems in the two-player game Glow Hockey and music creation apps.
[Nexus 7 General] AZImmortal:
You pointed out yourself that this will cause problems with non-conductive cases, so whether or not you want to call it a handheld device, it's obviously a problem that should not exist.
[Nexus 7 General] saadi703:
Yes hopefully
[Nexus 7 General] dilldoe:
that's like saying my 3rd party power adapter doesn't work with my nexus is obviously a problem that should not exist.

the OFFICIAL case by Asus is made with the same material as the back of the nexus, so you should not have this issue.

---------- Post added at 03:43 PM ---------- Previous post was at 03:33 PM ----------

if you want to play it on a flat surface without crossing issue then plug in your charger. that should ground it and eliminate the issue.

You people are nit picking a $200 device, of course it's not gonna be the same as other (more expensive) tablets. "oh it doesn't have a rear camera, this is not the tablet for me!" A solution(s) and an explanation has been given on why it does this, yet you still complain about it.
[Nexus 7 General] AZImmortal:
You might find this hard to believe, but there are times where you might not be near your charger (crazy, I know). This grounding issue isn't some type of feature limitation, it's a design flaw. Your "solution" is exactly like Apple telling you that you're holding it wrong, and do you remember what the outcome of that was? I do.

https://www.iphone4settlement.com/
[Nexus 7 General] Draje0:
Carrying a charger around is not an acceptable solution for a $200 product.

Speaking of price, $200 is a lot to pay for something that is defective. Do you not see the difference between functioning multitouch and a rear camera? The device does not advertise a rear camera because it does not have one. However, it does advertise multitouch which does not work properly for me.
[Nexus 7 General] dilldoe:
then put it on the floor, rug, your lap or just hold it.

point is multitouch still function except under 1 specific condition, which rarely anybody does.

Apple case is totally different, it fails to function under normal, intended use. if multitouch fail while you're holding it, then yes it's the same but it doesn't.

---------- Post added at 05:47 PM ---------- Previous post was at 05:36 PM ----------

does multitouch not function properly when you have it held in your hand, like how Google advertise?

http://www.youtube.com/watch?v=CtJLWVyWbYo

if not, then return it
[Nexus 7 General] AZImmortal:
Should I use a third hand to hold the tablet if I'm using one of the many piano apps in the Play Store? Or is putting the tablet on my non-grounding table and having multitouch work properly too much to ask? Is using a Play Store app normal enough for you?
[Nexus 7 General] icemasta31:
Doing some more tests, the issue only happens for me when I move the finger points very slow for them to match up. When I move my fingers very quickly across the screen everything is perfect, this is when laid down. Holding it up, its perfect otherwise.

I called Google and told me to exchange/return and told me it's hardware but he didn't seem to confident.
[Nexus 7 General] Draje0:
Actually, they do show it being placed on a table at 0:28 - Camping and I most certainly returned the three Nexus 7's I tried. While it is not multitouch being shown, the device's type of touch recognition is being advertised as multitouch and since the device is being touched while not being held, we can assume that the device is defective. There is no mention that only single touches will work flawlessly while not being held.
[Nexus 7 General] nawoa:
Is this the issue everyone here is having? http://www.youtube.com/watch?v=u1TrMbr-qtM
[Nexus 7 General] darkquota:
I don't seem to have the issue. I used the same app in the video and did similar testing while holding the tablet in my hands and lasting it parallel to the ground, and could not replicate the problem. I am using a PU leather case if it matters.

Sorry for those affected and hope you can get it fixed.
[Nexus 7 General] dilldoe:
no, go file a class action suit against Google & Asus. get your 15 bucks and still have the same issue and continue to gripe about it

or use one of the solutions posted on this thread and get on with your life :rolleyes:

---------- Post added at 02:12 AM ---------- Previous post was at 02:07 AM ----------

nor is there any mention that multitouch will work flawlessly either :laugh:

so you are getting what's advertised
[Nexus 7 General] AZImmortal:
And what exactly is your solution if I need to lay the tablet on a non-grounding table and I can't plug in my charger? Also, your idea that features need to be advertised as working flawlessly in order to work flawlessly is inherently flawed. Does a car manufacturer need to advertise that their brakes work flawlessly before their car is recalled for having defective brakes?
[Nexus 7 General] PROlific666:
Plug in your head phones or if your playing for someone and you want them to hear you could plug it a little bit but not enough to make the audio switch to the headphones... if that doesnt work they sell a tiny mic that was used for the iPod touch that plugs in the headphone jack. That should solve your grounding problem.
[Nexus 7 General] itudy:
At the begging I was obsessed with the Nexus 7... I was like "give me two of those!" and I really wanted to sell my 1st gen iPad but now it seems that it's not so perfect after all :( . The screen lifting issue, now some multitouch issues, LED display problems, doubtful Google play app selection and quality. Is it still worth selling my iPad to get one of these? I know, Apple products are not perfect either: the iPad 2 had and still has noticeable backlight bleeding, iPad 3 gets pretty hot (not really a problem at all but still...). I guess that's why it costs 200$
[Nexus 7 General] gotak:
The multi touch issue resets with a lock unlock cycle. It's likely a software issue that can be fix.

The nice thing about this tablet. It fits in the front pocket of my pants with no discomfort (not jeans). Which means I can carry it around without having to carry a bag.