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Hi.
I've a very annoying problem with control in my G1.
Now that I have the phone since days ago, and I've updated it to JF 1.5 is much less frequent, but it is still happen.
Sometimes, the screen doesn't respond as I expect, for example, activating a bottom option while I've touch in the upper part of the list.
Also it stuck with a icon as if I want to move it, without I touch it, or the cursor moves quickly from one icon to another without touch the trackball.
Can anyone help me with this problem?
Could it be a problem with a driver or another software? Or do you think it is that the screen have received a hit?
It is from eBay, with a month of use, but when a I see it for first time it doesn't have any signals of hits.
(As always, sorry about my poor written english)
If you've changed OS's through out this process and its still happening all signs point to a hardware issue...
Charger issue?
I have the same problem...
After looking a while I found that it might be the way you're charging your phone.
Some people said that if you're charging the phone from mains, it might be disturbing the capacitance screen as the power and voltage are not regulated as well as in a computer PSU...
I have that problem far less since I only charge my phone on my computer's USB ports.
Hope it works!
Any one here has a problem with the touch screen when playing some fps games of Gameloft like Sandstorm, Nova, Bia2 ... ?
Sent from my MotoA953 using XDA Premium App
No such problems
Sent from my Desire HD using XDA App
Im having some multitouch issues @gunbros havent tried any other multitouch games.
Sent from my MotoA953 using XDA App
I think there is problem with Milestone 2's multitouch. I'm not sure this is a hardwares or softwares issue.
Hi. Are you playing with the charger connected? Capacitive screens are very sensible to leakage currents. If there is some ghost touch happening, it's the charger's fault. The original charger doesn't have this problem, but if you are using a generic charger or usb cable connected to your pc/laptop, there might be some leakage current.
Maybe your issue is connected with limitation of Milestone 2. It supports only 2 fingers tracking. Maybe your are using more of them during play and some of them are not tracked correctly.
AragornPE said:
Hi. Are you playing with the charger connected? Capacitive screens are very sensible to leakage currents. If there is some ghost touch happening, it's the charger's fault. The original charger doesn't have this problem, but if you are using a generic charger or usb cable connected to your pc/laptop, there might be some leakage current.
Click to expand...
Click to collapse
I experienced the ghost touch with my original charger as well...
Sent from my MotoA953 using XDA App
Sorry if it's a little bit side-tracking.
Do you guys experience lags when sliding through the menu (notification bar, contacts, etc.)? I mean the sliding is smooth but it is not synchronizing with my finger. It lags for like 0.5 sec until it scrolls to the place it's supposed to be.
If you own a DEFY and do a direct comparison you'll know what I mean.
I have the exact same problem with my Milestone 2 and it's bloody annoying.
I wish that Gameloft added the ability to assign hard keys; using the keyboard for directions and the camera button to fire would not only eliminate the problem but make the game much easier to play.
havent really had any problems with game loft. but i experienced tonnes of touch screen issues after installing the game 'Words'. as soon as i removed it, ive not had any touchscreen issues, including ghost touch.
I haven't got any issues with the touch up to now. Even playing with a connected (original) charger doesn't cause any problems.
That's annoying TBH. At least if everyone was having these problems there is a chance that Motorola would acknowledge and address the problem, but as it seems like an unlucky handful of people having this issue, I doubt it would be rectified. I'm reluctant to send my phone in for repair as I've got a feeling I'll just get it back with the same fault.
the games need multitouch wouldn't run well . i assuming that one finger can obstruct another
I've fixed it! At least, it seems to be fixed
I read a few times of people disconnecting their batteries (!) and that seemed to fix the issue. I tried it myself, leaving the battery out for an hour or so, and it didn't rectify it. So in desperation I tried leaving the battery out overnight. I played NOVA this morning and it seems just fine. Still gets a little confused but nowhere near as frustrating to play as it was before.
I hope this trick works for you guys.
Oh, by the way, before I did this I downloaded Simply Draw to check if the digitiser was faulty and it worked perfectly, so I knew that wasn't the problem. Anyone who has seen the Youtube video about the dodgy Milestone 2 touchscreen will know what I'm on about.
I also experimenting problems on games, but on simply draw it was ok to me.
where is this video you are talking about?
hugs
I use the App "Screen Test Toolkit" from the market. When my Phone is connected to the original charger, I experience massive touchscreen problems in the upper and lower left corner.
Oh, connected to the charger a lot of people experience severe problems with the touchscreen. Mine is absolutely not usable to surf through the web while the phone is plugged in...
Guys, if you have such a problem, try the USB extension cable. I am using this 1,2m long cable and I have no problem with touch screen when phone's charging And Idon't know why...
I have problems playing games on the M2. It seems that is the "intended" behaviour on the multitouch. For example, try PES11. Sometimes it seems that the touch screen gets "confused" and messes with the touch points. Also, check this:
supportforums.motorola.com/message/372437
Title edit: Bad screen INPUT responsiveness
Hi all. I just got my Galaxy Note and it is awesome. I am having two issues with it though. First off it has a "dead pixel", which I guess cannot be fixed and I need a replacement? Second off it has a very poor screen input responsiveness (my old Samsung Galaxy S has waaaay better responsiveness) in the lower right side (when typing sms'es it becomes kinda obvious when using backspace!), so I would like to hear if that is only my Note, or everyone else has the same problem (it may have something to do with the s-pen tech?). Try touching the touch screen ever so slightly on the left side to type in a letter and then try the same on the backspace key - will it register input all the time?
My screen is fully responsive on every key on the keyboard, just tested exactly as you describe.
Sorry to hear you have a dead pixel. I haven't had any screen responsiveness issues.
Okay everyone - just found out that the issue with the responsiveness only occurred when charging - after unplugging it it works like a charm Still have the dead pixel though =/
kasperknop said:
Okay everyone - just found out that the issue with the responsiveness only occurred when charging - after unplugging it it works like a charm
Click to expand...
Click to collapse
Hmm... that's still unusual.
I got an ebay charger for my mytouch 4g.
It's an external charger for my spare battery and it has an USB port for charging your phone at the same time.
When I use it to charge my mytouch 4g, my mytouch 4g's screen goes totally unresponsive. This doesn't occur with any other chargers.
I wonder if it's something similar?
- Frank
I bought this thing first off of Amazon, and it was backordered... So I canceled and ordered from Newegg. Fine, i have to pay for shipping, and wait longer, but whatever.
I get the tablet, so excited, and i notice first that the screen would switch orientation when it shouldn't have. Like if i have it in landscape, then lay it flat on it's back, it would go into portrait. This could be recreated every time, so it wasn't just a fluke. I installed Asphalt 8 Airbourn and tried to play. I held the tablet flat, then all of a sudden when the car took off, it took a sharp right and ran straight into a wall.
Great... the accelerometer is broke. Also i can see the backlight flickering a little bit.
I request an RMA from Newegg and they said it'd take probably about a week to get it back. Get it processed, about to go take it back and check their site to see if it's in stock still and it's sold out. I get on their chat to make sure and they said it's backordered, so i'd have to wait for it to come in or switch it to a refund. So i switched it to a refund and by that time, Microcenter in my area had them in stock so i dropped by and picked one up.
Go it home and it was acting fine, until i installed Asphalt again and then it ran the car into the wall again... Also, again, i can see the backlight flickering. Starting to get depressed, i contact Nvidia asking if this is a common problem and then they said it was the first they'd heard of it. They tried Riptide GP2 and said it worked fine on their test tablet. So i bought Riptide GP2 with my Google Opinion Rewards and tried it, the little water craft ran straight into the wall, just like the first tablet. They told me to try exchanging it again, and that they were sorry that i was having trouble.
I go back to microcenter, demonstrate what is happening, they give me a new tablet and tell me to install the game and test to see if this one does it before i leave with it. Their wifi was being crappy, so they gave me a USB Ethernet adapter and an OTG cable to connect to their Internet (it worked instantly, freaking awesome.)
Install updates, install app updates, install the game, it works... Finally have one that the Accelerometer works... I leave and go home, and the screen still flickers on this one too.... So thats the question part of this post, does anyone else have this tablet and notice the backlight flickering? It happens more often on darker brightness settings.
Other than the problems trying to get a working tablet, and the screen flickering, i love this tablet. The screen is really sensitive though, so when you're holding it and trying to hit edge of the screen, and you're barely touching somewhere else, it'll usually give you a hard time. The stylus is awesome, the screen can be very bright and easy to see out in the sun. The 1080p is a noticeable different over my 2013 N7 ( i can see the pixels in this tablet, i have very sensitive eyes and the ability to see very fine details) but it's still a great screen. the battery life at least for me is not as good as the 2013 N7, however it does make it through the day.
anyways... TL;DR: Love this tablet, had a pain in the ass of a time getting one that worked though. Also, does anyone notice the screen's backlight flickering like i do?
is it a continuous flicker or is it just slight changes in brightness when the screen content changes? there is a known "feature" called prism that does some kind of auto/dynamic brightness/contrast adjustment depending on whats showing on screen. there's a thread over at geforce.com about it. apparently it was introduced in a prior update on the other shield devices too so im hopeful its fixed. if its a true flicker and not just brightness changes, then its either defective or the backlight is pwm and you can see it. some people are sensitive to pwn backlights on regular computer monitors and can see the flicker. google pwm backlight if you're unfamiliar with the phenomenon.
It happens when the screen content changes, and i figured it'd be some kind of dynamic change.
it also happens when the screen has the content on screen constant. It's sort of like a pulse, sometimes it also gets bad for a split second. I don't really know how to explain it. it will be pulsing, then it will have a bad flicker then go back to pulsing. It gets worse the darker you make the brightness, and also when you turn on autobrightness (although im sure this makes it worse because it's trying to adjust the brightness in dark light).
I looked up the pwm backlight and it looks like it's mostly with LED backlights. Thats my guess of the backlight on this tablet. That makes sense though, because i can see a VERY VERY slight pluse on my work's Macbook Pro, and a slight pluse on my Nexus 5 too. I suppose that this might be the case.
I just don't see it being a defect because i've had three of them, from two different vendors and they've all done the exact same thing with the backlight.
I haven't noticed any screen flicker.
I am also comparing this forum with the N7 (2013) forum when it first came out.
Lots of people there seemed to have troubles getting a good one -- light leaks, touch screen issues (there were several firmware updates for this), dead pixels, etc.
At least so far, there seems to be fewer people (per captia) complaining here.
Speaking of touchscreen issues, I did notice something about my Shield Tablet...
I was using it in the evening, while connected to a charger. I suddenly had a terrible time typing. I had just installed Thumb Keyboard, so I thought that was the problem. Went back to the Google Keyboard. Still had trouble. Scrolling web pages was also slow/erratic. Reboot -- same thing.
The next day I took it to work -- lots of email, including lots of typing.. general usage, etc. --- all with no problem. Back at home in the evening, some games, Google+ (typing) -- no problem.
Later on I was surfing eBay, and again I could not type or scroll without a lot of problems.
I turned on Settings --> Developer options --> Show touches and --> Pointer location.
With my finger steady on the screen, it was showing lots of erratic movement, particularly in the vertical axis. Several mm of vertical error, and about 1mm horizontal. Sometimes clearly below the entire area my finger covered.
Then I realized that both times it happened I was connected to the charger (Travel Surge protector with 2 -- 2.1A(shared) USB outlets).
I disconnected the charger, and the problem went away.
Connected the charger, and after a few seconds, the problem returned.
I was using the included cable, and another 2.1A rated charger.
I changed to a different 2.1A rated charger, and did not have the problem.
Different cable, 1st charger -- No problem.
The problem is reproducible (although not always) only with the 2.1A travel surge protector, and the included NVidia cable.
I noticed that this thing will charge at nearly 2A. The included cable is quite long (as compared to the other cables I have laying around), but is not thinker. In fact it is thinner than other USB cables.
It's really too small a wire guage to run almost 2A for that length.
It is marked with the Shield symbol (Like the controller or the Shield Portable), and came wrapped in a thing that said "Use with", and the Shield controller symbol.
Was the wrong cable in my box?
How are other peoples cables marked?
Has anyone else noticed an erratic touch screen if you use it while charging?
Mine is marked the same as yours. I just notice the screen keeps poping on while it is charging for no reason.
Tapatalk
Linuxslate said:
I haven't noticed any screen flicker.
I am also comparing this forum with the N7 (2013) forum when it first came out.
Lots of people there seemed to have troubles getting a good one -- light leaks, touch screen issues (there were several firmware updates for this), dead pixels, etc.
At least so far, there seems to be fewer people (per captia) complaining here.
Speaking of touchscreen issues, I did notice something about my Shield Tablet...
I was using it in the evening, while connected to a charger. I suddenly had a terrible time typing. I had just installed Thumb Keyboard, so I thought that was the problem. Went back to the Google Keyboard. Still had trouble. Scrolling web pages was also slow/erratic. Reboot -- same thing.
The next day I took it to work -- lots of email, including lots of typing.. general usage, etc. --- all with no problem. Back at home in the evening, some games, Google+ (typing) -- no problem.
Later on I was surfing eBay, and again I could not type or scroll without a lot of problems.
I turned on Settings --> Developer options --> Show touches and --> Pointer location.
With my finger steady on the screen, it was showing lots of erratic movement, particularly in the vertical axis. Several mm of vertical error, and about 1mm horizontal. Sometimes clearly below the entire area my finger covered.
Then I realized that both times it happened I was connected to the charger (Travel Surge protector with 2 -- 2.1A(shared) USB outlets).
I disconnected the charger, and the problem went away.
Connected the charger, and after a few seconds, the problem returned.
I was using the included cable, and another 2.1A rated charger.
I changed to a different 2.1A rated charger, and did not have the problem.
Different cable, 1st charger -- No problem.
The problem is reproducible (although not always) only with the 2.1A travel surge protector, and the included NVidia cable.
I noticed that this thing will charge at nearly 2A. The included cable is quite long (as compared to the other cables I have laying around), but is not thinker. In fact it is thinner than other USB cables.
It's really too small a wire guage to run almost 2A for that length.
It is marked with the Shield symbol (Like the controller or the Shield Portable), and came wrapped in a thing that said "Use with", and the Shield controller symbol.
Was the wrong cable in my box?
How are other peoples cables marked?
Has anyone else noticed an erratic touch screen if you use it while charging?
Click to expand...
Click to collapse
Yeah, there are a lot of devices that will freak out when you're using different chargers. I was going to tell you to go back to the Nvidia cable and charger that were included with the device to see if that fixes it, but it looks like you've found out that the charger was the issue.
I'm still unable to tell if it's the PWM Backlighting method that was brought up earlier or not. I can't get anyone else to see it though, and after three devices, i'm starting to feel like it's something that is normal.
pencil316 said:
Mine is marked the same as yours. I just notice the screen keeps poping on while it is charging for no reason.
Tapatalk
Click to expand...
Click to collapse
Same thing happens with mine. While charging the screen will frequently come back on and then go off again in a few seconds. I haven't noticed the behavior when it's not charging. It's almost like something is running in the background causing it to wake up when charging.
bluejay2345 said:
Same thing happens with mine. While charging the screen will frequently come back on and then go off again in a few seconds. I haven't noticed the behavior when it's not charging. It's almost like something is running in the background causing it to wake up when charging.
Click to expand...
Click to collapse
Check if your bluetooth is on... Mine only does this when I leave my bluetooth controller connected.
No blue tooth is off
Tapatalk
I've noticed it slightly in low brightness but not as bad as the Tegra3 based N7 and TF700t. I'm guessing it has to do with prism if that's the case.
Sent from my SHIELD Tablet
Screen "Flicker" is the auto brightness, try changing to a manual brightness. I have noticed the orientation is very sensitive, sometimes when sitting down or moving a bit it will flip orientation on me, seems overly sensitive, whereas ive used other tablets that were not sensitive enough. Sounds like you may have had a few bad ones but the screen "issue" seems to be common, the light sensor seems to be overly sensitive (assuming changing to manual brightness resolves your case).
Eat it iPhone said:
Screen "Flicker" is the auto brightness, try changing to a manual brightness. I have noticed the orientation is very sensitive, sometimes when sitting down or moving a bit it will flip orientation on me, seems overly sensitive, whereas ive used other tablets that were not sensitive enough. Sounds like you may have had a few bad ones but the screen "issue" seems to be common, the light sensor seems to be overly sensitive (assuming changing to manual brightness resolves your case).
Click to expand...
Click to collapse
I haven't noticed any type of flickering on my TN7 or my new shield tablet. This could partially be because most of the time i have the brightness setting to manual. Its seems as when i have it on auto the screen is just a little too dim for me. Although, when using the tablet outside i usually have it on auto and the screen chooses the correct brightness so it can be best viewed.
As I mentioned, I haven't seen anything I would call a "flicker", but I am glad someone mentioned the auto brightness.
To me, the auto brightness seems a bit "hyper" -- too much gain.
A slight change in orientation to or away from room lighting causes a drastic change in screen brightness.
The same for a shadow from my thumb if I hold the tablet in landscape.
I guess it could cause a flicker, but it depends on the context of timing --- Kinda like "the dinosaurs died out quickly", vs. "the quark decayed quickly".
Also I want it to be clear that I am not complaining about my Shield Tablet. It's just that xda-forums are a place where things are discussed in minute detail. It is not a problem, issue or complaint.
I have no interest at all in using my Nexus 7 (2013) (or any other Tablet) since I got my Shield Tablet.
The weak wifi appears to be the priority focus Nvidia is now giving the tablet. Question is will they go into denial mode like Asus did with the T700, or address early and revise the design IF needed. Sales were badly impacted for the T700 and a high return rate, per Best Buy.
Hopefully a simple firmware fix, but weak wifi is almost always antenna related for devices like this.
rushless said:
The weak wifi appears to be the priority focus Nvidia is now giving the tablet. Question is will they go into denial mode like Asus did with the T700, or address early and revise the design IF needed. Sales were badly impacted for the T700 and a high return rate, per Best Buy.
Hopefully a simple firmware fix, but weak wifi is almost always antenna related for devices like this.
Click to expand...
Click to collapse
I don't think any of the shield tablets I've used so far have had Wi-Fi problems.
I have a similar issue. Check it out here:
Shield tablet screen defect: http://youtu.be/PUP_zAgpbxs
I have been on and off the phone with Nvidia trying to get them to ship me a new one for free. They refuse and I refuse to pay more shipping charges just to get a working device. Great tab otherwise. Just was unlucky and Nvidia has terrible customer service. I'm just returning it
markymark567 said:
I have a similar issue. Check it out here:
Shield tablet screen defect: http://youtu.be/PUP_zAgpbxs
I have been on and off the phone with Nvidia trying to get them to ship me a new one for free. They refuse and I refuse to pay more shipping charges just to get a working device. Great tab otherwise. Just was unlucky and Nvidia has terrible customer service. I'm just returning it
Click to expand...
Click to collapse
Man, I'm glad I don't have that issue. That looks like some sort of video driver.
bryctucker said:
Man, I'm glad I don't have that issue. That looks like some sort of video driver.
Click to expand...
Click to collapse
Tell me about it. Its been like that since I first turned the tab on 3 days ago. Nvidia refuses to acknowledge my issue and insists I pay return shipping and a restocking fee. I don't understand why I should pay more than every other customer just to get a properly working device. Nvidia has pushed me away from sticking with this tablet.
The flickering when the content changes is probably Nvidia's PRISM at work. Basically, it tries to optimize brightness and colour so that power usage is reduced.
Instead of maxing the backlight and telling the pixels to display dark grey, it dims the backlight and tells the pixels to display light grey, saving power.
It is an advanced form of autobrightness, and I think it can be disabled. But a continuous flickering should not be caused by this. This should happen only when the screen is refreshed.. like new page or picture
---------- Post added at 08:32 PM ---------- Previous post was at 08:29 PM ----------
markymark567 said:
I have a similar issue. Check it out here:
Shield tablet screen defect: http://youtu.be/PUP_zAgpbxs
I have been on and off the phone with Nvidia trying to get them to ship me a new one for free. They refuse and I refuse to pay more shipping charges just to get a working device. Great tab otherwise. Just was unlucky and Nvidia has terrible customer service. I'm just returning it
Click to expand...
Click to collapse
That IS a probelm.. for some reason the bottom is getting clipped and being sent to the top.. send them a picture.
I don't have the flickering problem either...but the tablet used to wake up constantly when charging ...but after I did a factory reset everything is fine now .... My only complain is the poor WiFi performance
One of my biggest complaints about the shield tablet was the sensitivity of the touch screen. It had the ability to pick up touches before my finger hit the glass. This lead to erratic navigation and painful text entry on the keyboard.
THe other day I managed to bring the sensitivity down just enough to make the tablet respond as I wanted..
Go into Settings, then the About tablet screen. Then rapidly touch the Model number option. This takes you into the Sensor calibration utility.
Running this utility will tell you not to touch the screen during the calibration process. Once the process is complete, the calibration data is saved with a reboot. For those people who have been having issues with the touchscreen no responding or issues with multitouch, then perhaps this method will help bring your touchscreen response back.
however I wanted to reduce the touchscreen sensitivity, so I tried a couple different things. During the calibration process I put my fingers on the surface of the touchscreen and allowed it to complete the process. once the tablet was rebooted I found that my touchscreen was definitely less sensitive, to to the point of having delayed touch response and double touches were not really registering too well.
I went back into the calibration utility and this time I just very lightly touched the screen with a single finger during calibration. To my surprise this seemed to do the trick. the touchscreen now responds to my in the same manner as my wife's ipad mini .. It is much easier to use overall. This could be all in my mind, and the sensitivity did not change.. However I am now enjoying the tablet alot more.
Fantastic tip.
I'd love to be able to do this, but tapping on the model number doesn't do anything on my tablet. I have the 32GB LTE tablet, but ti's still on KitKat. Are you on Lollipop?
Yes, i was on version 2.0 nvidia rom which was 5.0 lollipop.. However i have since updated to version 2.1 lollipop 5.01 and found that the touchscreen sensitivity was tweaked and nearly perfect without having to do any calibration tricks.. No more false touches...
However as a side effect, whatever they tweaked to fix the touchscreen caused the touchscreen to become unresponsive when charging the tablet with my antec 4 port usb charger. It worked without issue in version 2.0 and i downgraded to verify..
However version 2.1 touchscreen sensitvity is worth the hassle...also fixed all my lags and makes chrome usable..
chrisyng said:
Yes, i was on version 2.0 nvidia rom which was 5.0 lollipop.. However i have since updated to version 2.1 lollipop 5.01 and found that the touchscreen sensitivity was tweaked and nearly perfect without having to do any calibration tricks.. No more false touches...
However as a side effect, whatever they tweaked to fix the touchscreen caused the touchscreen to become unresponsive when charging the tablet with my antec 4 port usb charger. It worked without issue in version 2.0 and i downgraded to verify..
However version 2.1 touchscreen sensitvity is worth the hassle...also fixed all my lags and makes chrome usable..
Click to expand...
Click to collapse
That's a very odd issue but hey, at least one thing is fixed. The sensitivity fix is fantastic, no more accidentally placing units in random TH's in CoC.
Thank you for this tip! Fixed an issue I was having with the edge of the screen not registering when I tapped. :good:
Col.Kernel said:
Fantastic tip.
I'd love to be able to do this, but tapping on the model number doesn't do anything on my tablet. I have the 32GB LTE tablet, but ti's still on KitKat. Are you on Lollipop?
Click to expand...
Click to collapse
I apologize, I'm not sure how old is too old to reply to a post here, but make sure you press rapidly. It's not like tapping the build number to enter dev mode, where you can do it as slowly as you like as long as you hit the required number of clicks. You need to click 4 times within about a second to bring it up.
So that works reducing the screen sensitivity, how do I increase the screen sensitivity?
Ever since I upgraded the UI to 2.2, the tablet has been pretty unusable. I gave up and toss it away for awhile. It's just useless registering 1 tap out of 5 or more.
I figure I would give it one more try. if you guys have any tip of increasing that sensitivity. I'd rather have too much and have phantom taps than not enough.
It was also very annoying that I specifically stopped the lollipop upgrade, and it got in anyway.
how can I fix sensitivity on kit kat ?
chrisyng said:
Yes, i was on version 2.0 nvidia rom which was 5.0 lollipop.. However i have since updated to version 2.1 lollipop 5.01 and found that the touchscreen sensitivity was tweaked and nearly perfect without having to do any calibration tricks.. No more false touches...
However as a side effect, whatever they tweaked to fix the touchscreen caused the touchscreen to become unresponsive when charging the tablet with my antec 4 port usb charger. It worked without issue in version 2.0 and i downgraded to verify..
However version 2.1 touchscreen sensitvity is worth the hassle...also fixed all my lags and makes chrome usable..
Click to expand...
Click to collapse
Hi!
I have the same issue while charging. Do you know any fix for this?
Thank you!
Cheers, been looking for this.
I was able to use this method to get the sensitivity just right but it broke multi-touch.
Really nice tip! Many thanks for this!
That no response issue after a few fast tab is gone,
I can enjoy rhythm game without problem now.
Instead of finger, i put a tiny box like 10g on it while calibrating.
I'm also having the same problems with the shield k1. It's especially apparent when my fingers get a little sweaty. Screen calibration doesn't fix this issue for me. The only fix I have so far is to keep them absolutely dry. I sometimes use powder on my hands and will go to the extreme of using latex gloves just to get the touches to register correctly. If you find any other solutions, please update this post.