Database Users

Touch Screen Sensitivity

Here is a fix to increase sensitivity http://forum.xda-developers.com/showthread.php?t=2027476
Does you Nexus 4 touch screen not seem as sensitive as galaxy nexus? On mine it's not sensitive to light touches.
When I first bought the phone I had trouble pulling down the notification drawer, but dismissed it because I thought I touched under the screen. However, in the Gmail app today trying to click 'show pictures in message' it wouldn't register my touch as I do it really quick when I open a message. Also, the keyboard misses s few letters if I don't press harder on the screen.
I tested it by placing my finger on the screen very lightly but still feeling the screen on my finger and no touches registered until I pressed down harder. My Galaxy Nexus screen on the other hand is so sensitive, that before I even feel the screen it registers a touch.
Also, tested it on multi touch tester app and light touches wouldn't register.
Anyone else having this issue or is it just me?
Sent from my Nexus 4 using Tapatalk 2

I'm still waiting to get mine, but I hope you're able to get this resolved because that's really frustrating.
Bumping to see if anyone else has this issue.
Sent from my Galaxy Nexus using Tapatalk 2

Yeah, I'm not finding the screen as sensitive as my Galaxy S2 either. Certainly have to press a little harder for touches to register.

mrjeffery said:
Yeah, I'm not finding the screen as sensitive as my Galaxy S2 either. Certainly have to press a little harder for touches to register.
Click to expand...
Click to collapse
I don't understand why they wouldn't make sure to get this right (lg). Missing taps especially when typing is extremely annoying.
The Galaxy Nexus actually experienced an intermittent bug (pre 4.2) that decreased the screen sensitivity tempoarily. Details here: http://forum.xda-developers.com/showthread.php?t=1576739
You can view the pressure by going to Settings -> Developer Options -> turn on Pointer Location. This will allow you to see the Prs of each tap in your status bar. Normally your lightest taps that register will show anywhere from 0.28 to 0.32. However, after this bug is activated, you will mostly get values over 0.40 for your light taps. This is actually a very noticeable increase, especially when trying to type quickly.
Click to expand...
Click to collapse
Would you mind testing this on the N4? Thanks!

whittikins said:
I don't understand why they wouldn't make sure to get this right (lg). Missing taps especially when typing is extremely annoying.
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
I know what you mean. And I've gotten so used the galaxy nexus that I'm missing many taps while typing. I missed a few letter while typing this message.
Sent from my Nexus 4 using Tapatalk 2

reddv1 said:
I know what you mean. And I've gotten so used the galaxy nexus that I'm missing many taps while typing. I missed a few letter while typing this message.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
Check my edit above in case you didn't see it. Would you mind testing the PRS value?

whittikins said:
Check my edit above in case you didn't see it. Would you mind testing the PRS value?
Click to expand...
Click to collapse
I just tested it and the lowest value I could get was 0.48 PRS. I could touch the screen and nothing get detected until I pressed down.
With Galaxy Nexus I can touch the screen with my nail using the back of my finger and get a response.
Nexus 7 PRS: 0.01
Galaxy Nexus PRS: 0.28
Nexus 4 PRS: 0.48
Nexus S PRS: 0.06
Sent from my Nexus 4 using Tapatalk 2

reddv1 said:
I just tested it and the lowest value I could get was 0.48 PRS. I could touch the screen and nothing get detected until I pressed down.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
That's awful. People were noticing that values over .40 (for lightest taps) were noticeable when typing (me being one of them). This means the nexus 4 is even less sensitive than the galaxy nexus when the bug was present!!
I really hope this can be addressed in an update, but I'm worried that it's a hardware issue. Every manufacturer needs to use the iPhone as a standard regarding screen sensitivity...
Sent from my Galaxy Nexus using Tapatalk 2

whittikins said:
That's awful. People were noticing that values over .40 (for lightest taps) were noticeable when typing (me being one of them). This means the nexus 4 is even less sensitive than the galaxy nexus when the bug was present!!
I really hope this can be addressed in an update, but I'm worried that it's a hardware issue. Every manufacturer needs to use the iPhone as a standard regarding screen sensitivity...
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
I updated the values for all my nexus devices.
It is awful, I hope there is a software that can at least improve the sensitivity. I wondered if anyone can look at the kernel source code and adjust the values. I look in the commits and see if I can find any mention of touch sensitivity.
Sent from my Nexus 7 using Tapatalk 2

reddv1 said:
I updated the values for all my nexus devices.
It is awful, I hope there is a software that can at least improve the sensitivity. I wondered if anyone can look at the kernel source code and adjust the values. I look in the commits and see if I can find any mention of touch sensitivity.
Sent from my Nexus 7 using Tapatalk 2
Click to expand...
Click to collapse
I found some people having similar issues with the Optimus G, which is what the Nexus 4 is based on. By any chance does this only occur when you have it plugged in?
http://forum.xda-developers.com/showthread.php?t=1965375&highlight=touch+screen

whittikins said:
I found some people having similar issues with the Optimus G, which is what the Nexus 4 is based on. By any chance does this only occur when you have it plugged in?
http://forum.xda-developers.com/showthread.php?t=1965375&highlight=touch+screen
Click to expand...
Click to collapse
No, it occurs while not plugged in.
Sent from my Nexus 7 using Tapatalk 2

i hope its not like this on everything nexus 4 is everyone having this issue?

my god this is killing me... i want a nexus 4 soooo bad..and hell ill buy one even if its a piece of paper...but damn these issues are chewing away my heart one inch at a time..its frustrating..

Interesting. My 3 year old galaxy as registers as low as 0.13. And I average typing, I got around 35-45 PRS. That means I would miss some clicks on the N4.
Kinda disappointing
Sent from my GT-I9000 using xda premium

reddv1 said:
With Galaxy Nexus I can touch the screen with my nail using the back of my finger and get a response.
Click to expand...
Click to collapse
i'm not experiencing a problem with touch sensitivity, it feels as good and smoother than the GNex...but i can't select anything with my nail on either (i'm a girl with long nails)

n7of9 said:
i'm not experiencing a problem with touch sensitivity, it feels as good and smoother than the GNex...but i can't select anything with my nail on either (i'm a girl with long nails)
Click to expand...
Click to collapse
Can you test the touch sensitivity on you nexus 4 so we can compare, here's how
You can view the pressure by going to Settings -> Developer Options -> turn on Pointer Location. This will allow you to see the Prs of each tap in your status bar. Try to tap as light as possible.

Same here. No difference plugged or unplugged to charger.
My HD2 was even fine with my winterfingers (touchscreen gloves), but I cannot use them with the nexus.
Hopefully Google can change some software settings for this.

reddv1 said:
Can you test the touch sensitivity on you nexus 4 so we can compare, here's how
You can view the pressure by going to Settings -> Developer Options -> turn on Pointer Location. This will allow you to see the Prs of each tap in your status bar. Try to tap as light as possible.
Click to expand...
Click to collapse
N4 prs 0.36
GNex prs 0.32
N7 prs 0.06

Am I losing the plot or does my phone not have developer options in the settings?

mrjeffery said:
Am I losing the plot or does my phone not have developer options in the settings?
Click to expand...
Click to collapse
Go to About Phone and click on build number 7 times
Sent from my Galaxy Nexus using Tapatalk 2

Does anyone else have a misaligned touch screen?

Is anyone else having a slight misalignment on the touch screen?
For me touch is shifted about a millimeter or two to the right.
I've checked on both my N4 and my sister's N4 and both of us seem to be having this slight misalignment.
Both of us have REV 11 N4's. One was obtained through T-Mobile in January, the other was obtained through Google Play just last month.
I've checked on a few roms. I've tried CM, PA, and Stock with a multitude of different kernels (Franco, Faux, Trinity, CM, and stock).
To check:
1. Enable "Show touches" under the Developer menu.
2. Touch a part of the screen where you'll be able to see the touch bubble and hold it there.
3. Look at the screen at angle to see under your finger.
It's not a big deal, just something I've noticed when I had difficulty trying to use PIE on the left side of the screen. Although, I still would love to be able to get the screen recalibrated to have more accurate touch sensitivity to eliminate the difficulty that I have with CM's PIE.
Another question: Is anyone aware of any LG diagnostic tool to calibrate the screen? I remember back on the HTC sensation there was a file that you could load through HBOOT and get your screen calibrated from there.
Photo attached.

Oh wow I never noticed this , I have the same thing, never really had problems with it
Btw I have an older model , so its not just a Rev11 thing
Sent from my Nexus 4

Mine looks like its right on when I test. Maybe just a hair over to the right but nowhere near as far off as yours. Rev11 302K
-Sent from that.... you know.... thing that sends these things-

I'm pretty sure you have OCD. So, take some medicine. Your phone is fine, stop crying. :crying::crying::crying::crying::crying::crying::crying::crying::crying::crying::good:

Nope...

I thought I was just trippin when I noticed the same thing last week
Just tested and confirmed, pretty significant misalignment by about 1 cm, which is a LOT when you're talking about a <5" touch screen..
My next thought is, is this a software issue?
We need more people to test and confirm. But I believe that is what we will find. Software issue.
Anyone with a Nexus 7 on stock 4.2.2, please also test and report.

Wow never thought anyone else was experiencing this, mine seems to be off since I always have to touch a little higher than what I'm going for even nav bar.
Sent from my Nexus 4 using xda premium

Notified the same thing while playing Draw Something, I thought I was mad
Tapalked with my iNexus 4S

Nobody tested a Nexus 7 yet?
I'll test my wife's when I get home and post the results

Could not reproduce the issue on the Nexus 7. Looks like it's specific to the Nexus 4
Sent from my Nexus 4 using xda premium

ingenious247 said:
I thought I was just trippin when I noticed the same thing last week
Just tested and confirmed, pretty significant misalignment by about 1 cm, which is a LOT when you're talking about a <5" touch screen..
My next thought is, is this a software issue?
We need more people to test and confirm. But I believe that is what we will find. Software issue.
Anyone with a Nexus 7 on stock 4.2.2, please also test and report.
Click to expand...
Click to collapse
I would think that it's a software issue. My HTC sensation was able to have it's screen recalibrated. I think LG would have some kind of tool to be able to do it.

Same exact issue here but I wouldn't even notice if I didn't try
Sent from my Nexus 4 using xda app-developers app

For me its OK all stock

Mines fine, right where it should be.

This is with me too and cannot use the letter "cue" because of it
Sent from my Nexus 4 using Tapatalk 2

Touch Wake?

Maybe it's a little early to look for this, but there used to be a kernel mod for the Nexus S called touch wake. It was if you touched the screen, it would wake the screen(turn the screen on)....this saved the trouble of hitting a physical button to do it. Does anyone know if this mod is available for the Galaxy S4?

dman777 said:
Maybe it's a little early to look for this, but there used to be a kernel mod for the Nexus S called touch wake. It was if you touched the screen, it would wake the screen(turn the screen on)....this saved the trouble of hitting a physical button to do it. Does anyone know if this mod is available for the Galaxy S4?
Click to expand...
Click to collapse
We had the same thing on evo3D , sweep to wake. But seeing as there is a hardware key in between the capacities buttons it would be different and maybe more difficult to implement

AFAIK, there's none yet. But that sounds amazing. I hope some our kernel devs can add this feature :good:
Sent from my GT-I9505 using xda premium

Swipe to wake will be implemented by ktoonsez in his kernel. You'll have to Swipe across the display, not the capacitive buttons then.
Gesendet von meinem GT-I9505 mit Tapatalk 2

rauschkugl said:
Swipe to wake will be implemented by ktoonsez in his kernel. You'll have to Swipe across the display, not the capacitive buttons then.
Gesendet von meinem GT-I9505 mit Tapatalk 2
Click to expand...
Click to collapse
That sound great. On the touch wake that was on Nexus S, you could disable it temporarily(untill after the next wake) if you hit the hardware "turn screen off/sleep" button. Will swipe wake have the same thing?

No, but you don't need it because you won't perform this action by fault like a simple touch.
Gesendet von meinem GT-I9505 mit Tapatalk 2

Why is this discussion still here?? I thought the mods would have moved it by now. This should have been posted in q&a section.
Sweep2wake let's you wake the phone by swiping across the screen, it has to keep the touchsreen awake so it does drain a bit of battery but still a good feature, the creator of this is show-p1984.
Touchwake let's you wake the screen by touching anywhere but only when the screen times out by it self, it only holds a wakelock for a number of seconds set by the user, after that the phone sleeps like normal so it doesn't drain battery. I think this feature was made by Ezekeel.

Mahdi786 said:
Why is this discussion still here?? I thought the mods would have moved it by now. This should have been posted in q&a section.
Sweep2wake let's you wake the phone by swiping across the screen, it has to keep the touchsreen awake so it does drain a bit of battery but still a good feature, the creator of this is show-p1984.
Touchwake let's you wake the screen by touching anywhere but only when the screen times out by it self, it only holds a wakelock for a number of seconds set by the user, after that the phone sleeps like normal so it doesn't drain battery. I think this feature was made by Ezekeel.
Click to expand...
Click to collapse
Sorry about that. I realized that I might of posted in the wrong forum afterwards.
Yes, Touchwake does so by n seconds. But you can make it inifinity like and use the hardware button to temp. disable it. Ezekeel only made it for the Nexus S and this is what would preferable over swipe2wake implementation.

Really need some help setting this thing up

Help everyone. After a brief affair with the iPhone 5 this dinner, I have returned to Android via the Samsung Galaxy S 4.
Only problem is the bezels. They are too thin!! I literally can't type on this thing. Its not the size of the screen, I used to run a note, it's the bezels. Mainly the bottom one.
At the moment I run the GPE ROM. This is all fine and dandy, I'm loving the Nexus 4 like experience. But I miss the on screen buttons. They brought the bottom bezel size up significantly, making the typing experience amazing. I need that on this phone. But I also don't want the capacitive buttons. Luckily they dissapear when not lit up. And I found a flashable script to disable their functionality. I just need to find a ROM as stable as the GPE ROM and with on screen buttons and IR support like the GPE ROM.
Does anyone have any ideas? Other than the typing issue I like the phone. It's not nearly as comfortable as the 4.7" screen of the Nexus but its usable and really my only choice to get back to my Android home.
Thanks!
Sent from my GT-I9505G using Tapatalk 2

WOW, talk about picky! Maybe I'm just a noob, but what do you mean by on screen buttons?

agent929 said:
WOW, talk about picky! Maybe I'm just a noob, but what do you mean by on screen buttons?
Click to expand...
Click to collapse
He means soft buttons. Like on the nexus devices.
OP, there's a couple aosp roms in the original Android development section that include soft buttons.

xBeerdroiDx said:
He means soft buttons. Like on the nexus devices.
OP, there's a couple aosp roms in the original Android development section that include soft buttons.
Click to expand...
Click to collapse
Got ya...guess I'm not totally familiar with some of the jargon
Sent from miPhone using XDA Premium HD app

Orange_furball said:
Help everyone. After a brief affair with the iPhone 5 this dinner, I have returned to Android via the Samsung Galaxy S 4.
Only problem is the bezels. They are too thin!! I literally can't type on this thing. Its not the size of the screen, I used to run a note, it's the bezels. Mainly the bottom one.
At the moment I run the GPE ROM. This is all fine and dandy, I'm loving the Nexus 4 like experience. But I miss the on screen buttons. They brought the bottom bezel size up significantly, making the typing experience amazing. I need that on this phone. But I also don't want the capacitive buttons. Luckily they dissapear when not lit up. And I found a flashable script to disable their functionality. I just need to find a ROM as stable as the GPE ROM and with on screen buttons and IR support like the GPE ROM.
Does anyone have any ideas? Other than the typing issue I like the phone. It's not nearly as comfortable as the 4.7" screen of the Nexus but its usable and really my only choice to get back to my Android home.
Thanks!
Sent from my GT-I9505G using Tapatalk 2
Click to expand...
Click to collapse
xBeerdroiDx said:
He means soft buttons. Like on the nexus devices.
OP, there's a couple aosp roms in the original Android development section that include soft buttons.
Click to expand...
Click to collapse
My girlfriend had the exact same problem and he's right - there are some great ROMs on there that will have exactly what you're looking for. There are some that coincide with the haptic buttons and some that are stand alone and do not use them at all.
Some can be found at:
http://forum.xda-developers.com/forumdisplay.php?f=2257#romList
You can also find more by searching for specific ones.

Orange_furball said:
Help everyone. After a brief affair with the iPhone 5 this dinner, I have returned to Android via the Samsung Galaxy S 4.
Only problem is the bezels. They are too thin!! I literally can't type on this thing. Its not the size of the screen, I used to run a note, it's the bezels. Mainly the bottom one.
At the moment I run the GPE ROM. This is all fine and dandy, I'm loving the Nexus 4 like experience. But I miss the on screen buttons. They brought the bottom bezel size up significantly, making the typing experience amazing. I need that on this phone. But I also don't want the capacitive buttons. Luckily they dissapear when not lit up. And I found a flashable script to disable their functionality. I just need to find a ROM as stable as the GPE ROM and with on screen buttons and IR support like the GPE ROM.
Does anyone have any ideas? Other than the typing issue I like the phone. It's not nearly as comfortable as the 4.7" screen of the Nexus but its usable and really my only choice to get back to my Android home.
Thanks!
Sent from my GT-I9505G using Tapatalk 2
Click to expand...
Click to collapse
You should give Task's AOKP a try. He works really hard to make sure it is as stable as possible, and you can activate the on-screen buttons.

mattdm said:
You should give Task's AOKP a try. He works really hard to make sure it is as stable as possible, and you can activate the on-screen buttons.
Click to expand...
Click to collapse
Do you know if that ROM supports the IR blaster? Its not extremely necessary just a nice thing to have
Sent from my GT-I9505G using Tapatalk 2

Orange_furball said:
Do you know if that ROM supports the IR blaster? Its not extremely necessary just a nice thing to have
Sent from my GT-I9505G using Tapatalk 2
Click to expand...
Click to collapse
Yes it does. the latest 4.2.2 build works superbly. Grab the gapps from the 14th (in his thread). Cheers.

Orange_furball said:
Do you know if that ROM supports the IR blaster? Its not extremely necessary just a nice thing to have
Sent from my GT-I9505G using Tapatalk 2
Click to expand...
Click to collapse
As a second confirmation - yes it does
Sent from miPhone using XDA Premium HD app

One last question, is vibration alerts like really weird on this phone? Not just the ROM, I mean the phone in general. The vibrator is extremely loud, doesn't buzz very well, and with notifications it'll either go off in three very strange bursts or two very short bursts.
This is nothing like my iPhone, nexus 4, galaxy bite 10.1, or really any device I've ever used.
You might think I'm being really picky, but I just want to make sure this is normal
Sent from my GT-I9505G using Tapatalk 2

Orange_furball said:
One last question, is vibration alerts like really weird on this phone? Not just the ROM, I mean the phone in general. The vibrator is extremely loud, doesn't buzz very well, and with notifications it'll either go off in three very strange bursts or two very short bursts.
This is nothing like my iPhone, nexus 4, galaxy bite 10.1, or really any device I've ever used.
You might think I'm being really picky, but I just want to make sure this is normal
Sent from my GT-I9505G using Tapatalk 2
Click to expand...
Click to collapse
Mine isn't very loud. I think you can adjust what it does for vibrations in settings but if it's new I would exchange it just in case.
Sent from miPhone using XDA Premium HD app

agent929 said:
Mine isn't very loud. I think you can adjust what it does for vibrations in settings but if it's new I would exchange it just in case.
Sent from miPhone using XDA Premium HD app
Click to expand...
Click to collapse
Unfortunately its not new :/ I'll just have to pick up a replacement one and toss it in
Sent from my GT-I9505G using Tapatalk 2

Orange_furball said:
Unfortunately its not new :/ I'll just have to pick up a replacement one and toss it in
Sent from my GT-I9505G using Tapatalk 2
Click to expand...
Click to collapse
Do you mean a replacement phone, or a replacement vibrator?? Remember, if you get a replacement phone, you won't be able to flash any custom roms.

mattdm said:
Do you mean a replacement phone, or a replacement vibrator?? Remember, if you get a replacement phone, you won't be able to flash any custom roms.
Click to expand...
Click to collapse
Replacement vibrator. I'm out of warranty already I think
Sent from my GT-I9505G using Tapatalk 2

So, this ROM is amazing!!! Well I just have one small issue, the nav bar covers up the bottom portion if NY screen, so typing in the message fields in the Messages app doesn't work, and I can't see the footer in most web pages in Chrome.
Other than that, wow! Smoothest ROM I've ever used! With Dynamic Notifications from the play store the ROM is literally perfect, once I figure out the NavBar issue and how to disable the capacitive buttons (the flashable script I found didnt work :/)
Sent from my SGH-I337 using Tapatalk 2

Orange_furball said:
So, this ROM is amazing!!! Well I just have one small issue, the nav bar covers up the bottom portion if NY screen, so typing in the message fields in the Messages app doesn't work, and I can't see the footer in most web pages in Chrome.
Other than that, wow! Smoothest ROM I've ever used! With Dynamic Notifications from the play store the ROM is literally perfect, once I figure out the NavBar issue and how to disable the capacitive buttons (the flashable script I found didnt work :/)
Sent from my SGH-I337 using Tapatalk 2
Click to expand...
Click to collapse
A couple of things:
1. Keep in mind, using Dynamic Notifications on an Android 4.2 rom will result in battery drain while the notification is active. An Android 4.3 rom would be better for that, since it has the new "NotificationListenerService" feature.
2. For disabling the capacitive buttons, it might be worthwhile to move to a rom that has full hardware key rebinding. I'm a big fan of SlimBean. There is a settings screen that lets you choose exactly what each of the buttons does, and you can just set it all of them to "none", and then disable button backlighting in Display settings.
SlimBean has it's own look and feel, because the DPI is very low and the Slim logo is inserted a few places. All of this can be changed, though, if you prefer a more stock experience.
Feel free to PM me if you have any questions; I'll be happy to help.

Double Tap Lock & Wake Feature

Does anyone has any idea regarding how the double tap to lock and wake works?
Need a port to other devices

I highly doubt it works on rom or device other than the g2 stock rom at this point.
Maybe scrosler knows.

I believe it is part of the launcher.... I thought I read some where that if you installed 3rd party launcher you lost that function...
Sent from my VS980 4G using XDA Premium HD app

mouf32 said:
I believe it is part of the launcher.... I thought I read some where that if you installed 3rd party launcher you lost that function...
Sent from my VS980 4G using XDA Premium HD app
Click to expand...
Click to collapse
nope its in the kernel, the launcher just allows you to do it anywhere on the homescreen if you are on a 3rd party launcher you just have to tap the status bar

thoughtlesskyle said:
nope its in the kernel, the launcher just allows you to do it anywhere on the homescreen if you are on a 3rd party launcher you just have to tap the status bar
Click to expand...
Click to collapse
Or download "Lock Screen" from the play store and make a double tap gesture with nova launcher that opens the activity of that app. That's what I did and I have the double tap to lock working. The unlock works regardless of launcher.
Sent from my LG-D800 using xda app-developers app

sublimejosh2000 said:
Or download "Lock Screen" from the play store and make a double tap gesture with nova launcher that opens the activity of that app. That's what I did and I have the double tap to lock working. The unlock works regardless of launcher.
Sent from my LG-D800 using xda app-developers app
Click to expand...
Click to collapse
I'm Def gong to have to do that now thanks for the tip
Sent from my LG-D800 using Tapatalk 4

I think its the kernel. Pgm in the market does this. This feature has been out on the galaxy nexus.
Sent from my Nexus 10 using Tapatalk 2

leyvatron said:
I think its the kernel. Pgm in the market does this. This feature has been out on the galaxy nexus.
Sent from my Nexus 10 using Tapatalk 2
Click to expand...
Click to collapse
Same with the HTC one
Sent from my LG-D800 using Tapatalk 4

Yup, I'm using the nova launcher, double tap status bar still working
Anyone has any idea how does it work? Is it the digitizer just stay awake and listen for unlock? Won't it consume a lot of battery?
Sent from my LG-D802 using xda app-developers app

woshiitcy said:
Yup, I'm using the nova launcher, double tap status bar still working
Anyone has any idea how does it work? Is it the digitizer just stay awake and listen for unlock? Won't it consume a lot of battery?
Sent from my LG-D802 using xda app-developers app
Click to expand...
Click to collapse
I attempted to write an app to do this a long time ago. If its app-based like that, it needs to keep at least a partial wakelock on the phone to "listen" for the knock knock.
My guess is, on a multi-core CPU like the G2 has, they are turning off all but one core and putting that one core in the lowest MHz it will run, just to "listen" for the knock knock. Not app-based, but kernel based (like PGM). Clearly this doesnt use very much battery at all, as judged by the stellar battery life people have been reporting and that Ive seen on my own G2.

chrisexv6 said:
I attempted to write an app to do this a long time ago. If its app-based like that, it needs to keep at least a partial wakelock on the phone to "listen" for the knock knock.
My guess is, on a multi-core CPU like the G2 has, they are turning off all but one core and putting that one core in the lowest MHz it will run, just to "listen" for the knock knock. Not app-based, but kernel based (like PGM). Clearly this doesnt use very much battery at all, as judged by the stellar battery life people have been reporting and that Ive seen on my own G2.
Click to expand...
Click to collapse
hi
I thought it worked off a motion sensor.. unlike the HTC One kernels and franciscofranco's mako kernel, which use the touchscreen. I can't remember where I read it but I think it uses motion sensors for this, gyro or something
I don';t think it uses the main CPU cores, it uses another ultra low power one to work. This is why these features drain so much on the One, because it doesn't have the extra things that the G2 and MotoX have
no idea what I am doing in this forum but I thought I'd answer it
Edit:
The software platform is Android 4.2.2, and atop that is LG’s skin. LG has added a bunch of new features to its skinned Android experience, although its visual themeing remains essentially unchanged. Double tap to turn on and off uses the built in accelerometer to wake the phone up or turn it off – you just double tap quickly on the device when it’s in an off state to turn it on, and double tap quickly on a blank part of the display or status bar to turn it off. I don’t have a problem getting my index finger to the raised power button, but this is obviously an accommodation just in case that’s difficult.
Click to expand...
Click to collapse
-http://www.anandtech.com/show/7205/hands-on-with-the-lg-g2-lgs-latest-flagship
Haven't looked into any code but Brian is knowlegable when it comes to these things
Could be the reason why, *according to reviews* it doesn't work 100% of the time

woshiitcy said:
Yup, I'm using the nova launcher, double tap status bar still working
Anyone has any idea how does it work? Is it the digitizer just stay awake and listen for unlock? Won't it consume a lot of battery?
Sent from my LG-D802 using xda app-developers app
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Click to collapse
I lose about 1% battery every 3-4 hours when idle the whole time so while it may consume more battery the amount lost doesn't matter to me since idle drain is still hardly anything.

With the screen off and in the right light I can see hundreds of small grid like squares. I always assumed that they had something to do with the knock on feature.
Sent from my Galaxy Nexus using xda app-developers app

bigdjeff said:
With the screen off and in the right light I can see hundreds of small grid like squares. I always assumed that they had something to do with the knock on feature.
Sent from my Galaxy Nexus using xda app-developers app
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You know pretty much every super LCD screen has them, it's just to what degree they show
Sent from my LG-D800 using Tapatalk 4

I'm pretty sure it's NOT the accelerometer.
I tried it, and it even works with the slightest touch I can do. I hardly touched it at all. Can't believe, that there was any motion.
Furthermore it doesn't work when knocking with my fingernail or any other thing.
So I think, it really works by touch-recognition by the display.

eFCiKay said:
I'm pretty sure it's NOT the accelerometer.
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you are right. it's definitely the touch screen waiting for the touches.
just try it on the edges on the screen - still works. next to the edges - doesn't work.

There's this post that I read somewhere from HardwareZone:
Not too sure if this is a solution, my imagination or simply I have gotten perfect overnight on using the KnockON feature but the insensitivity issue, that many and myself, have been facing is now gone - since last night, after I performed the following tests on my G2. (Yes, thses are merely TESTS, so wasn't expecting much..)
I got my set on the 26/9/13 and until last night this function got rather spot-on accurate and is not behaving in that erratic manner any more - at least for me. Here are the steps :
First Test
- Key in 3845#*802# on your phone dial.
- HW Device Test > Touch Test > Multi Touch Test
At this point, drag your finger across the screen from corner-to-corner and when your done. Press Volume-Up key once to exit.
Second Test
- From the same menu select "Touch Sensing Test 7*12"
- Tap in every box as many times as you want and on the red text as well at the bottom of the screen.
- Press Volume-Up Once to see result
- Press Volume-up again to Exit
- Finally, to exit the whole menu just use "return" soft key.
Once again, I like to highlight as strange as it may sound the above method has worked for me. And if not, then something definitely has. Do take note, Rockwell screen protector is still on and lastly, please do share your findings.
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I tried it and strangely this seems to work. I can't tell if it's placebo but now I'm a hell lot more confident that my phone will wake up at the first pair of knocks.
Also, this is definitely true for me:
The knock on is 100% effective the first try when my phone is lying flat on my desk OR vertical on a car mount. In fact, these are the only 2 instances where I actually use KnockON. When I hold my phone, I naturally use the power button. Yes, I still do have probs with knockON when I use my thumb to wake it up while holding the phone.

3845#*802# did nothing for me. No menu.

There are apk for the knock on feature. But I'm sure there are libs and services involved
Sent from my LG-D801 using XDA Premium 4 mobile app

poondog said:
hi
I thought it worked off a motion sensor.. unlike the HTC One kernels and franciscofranco's mako kernel, which use the touchscreen. I can't remember where I read it but I think it uses motion sensors for this, gyro or something
I don';t think it uses the main CPU cores, it uses another ultra low power one to work. This is why these features drain so much on the One, because it doesn't have the extra things that the G2 and MotoX have
no idea what I am doing in this forum but I thought I'd answer it
Edit:
-http://www.anandtech.com/show/7205/hands-on-with-the-lg-g2-lgs-latest-flagship
Haven't looked into any code but Brian is knowlegable when it comes to these things
Could be the reason why, *according to reviews* it doesn't work 100% of the time
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Could be the motion sensor. Try doing the double tap while holding the phone in your hand... It become completely unreliable. BUT, it's 100% reliable for me while the phone is laying on a flat surface.