Develop Bugs

[Q] Screen wont turn on after it turns off. ATT Tilt 2

Everytime I boot my phone up, it works fine up until when the screen goes into sleep mode. Once it goes into sleep mode I cannot turn the screen back on, it stays black. The keyboard, end and answer key lights show up when I press the power button but the screen just stays black no matter what button I press.
I end up having to either take the battery out or using the stick to press the reset button on the side in order to get the phone to where I can see the screen again. I have adjusted the settings to where the screen doesnt go into sleep mode and the screen just stays on but that drains my battery. I want to be able to have my screen go off so I can save power but if it goes off it wont come on again until I reboot.
I have done a hard reset. This problem started happening to me when I started using the Energy Rom but I've even flashed different Roms and the problem still exist.
Somebody please tell me what's wrong! I need help! This is a big annoying problem to have. Thanks.

is this problem occurring when you slide the keyboard out?
i had the t-mobile touch pro2 with this problem.
the screen would die when the keyboard was out and not come back.
if this is the case, what i did was...
well. obviously not open the keyboard fully.
but if i accidentally had.
instead of pulling out the battery, i waited...
till the screen 'naturally' went to sleep.
than i would pull out the stylus or press power button
and the screen would come on.
sh4d0w86.

sh4d0w86 said:
is this problem occurring when you slide the keyboard out?
i had the t-mobile touch pro2 with this problem.
the screen would die when the keyboard was out and not come back.
if this is the case, what i did was...
well. obviously not open the keyboard fully.
but if i accidentally had.
instead of pulling out the battery, i waited...
till the screen 'naturally' went to sleep.
than i would pull out the stylus or press power button
and the screen would come on.
sh4d0w86.
Click to expand...
Click to collapse
Yes the problem still exist even when I slide the keyboard out. Once the screen goes off, that's it....pressing the power button to get it out of sleep mode, sliding the keyboard, I press all buttons and nothing works. The only thing that "works" to get the screen back on is removing the battery or using the stylus to press the reset button.
When sliding the keyboard out the keys light up but the screen doesn't come on, also pressing the power button lights up the end and answer keys without the screen coming on.

themasterhook2000 said:
Yes the problem still exist even when I slide the keyboard out. Once the screen goes off, that's it....pressing the power button to get it out of sleep mode, sliding the keyboard, I press all buttons and nothing works. The only thing that "works" to get the screen back on is removing the battery or using the stylus to press the reset button.
When sliding the keyboard out the keys light up but the screen doesn't come on, also pressing the power button lights up the end and answer keys without the screen coming on.
Click to expand...
Click to collapse
so. whenever the screen goes out, period, you cant get it back?
or the screen goes out and cant get it back once you slide the keyboard out?
if it is only when sliding out the keyboard...
try not opening the keyboard fully on the right side.
on my rhodium, after that point, the screen goes out.
sh4d0w86.

sh4d0w86 said:
so. whenever the screen goes out, period, you cant get it back?
or the screen goes out and cant get it back once you slide the keyboard out?
if it is only when sliding out the keyboard...
try not opening the keyboard fully on the right side.
on my rhodium, after that point, the screen goes out.
sh4d0w86.
Click to expand...
Click to collapse
Yes, period. Also, you know when you put your face to the phone during a call and the screen goes off so your face wont press anything on the screen? It doesn't come back on from that either once I end the phone call, it just stays black. I'm assuming you don't have any other suggestions. This Sucks

themasterhook2000 said:
Yes, period. Also, you know when you put your face to the phone during a call and the screen goes off so your face wont press anything on the screen? It doesn't come back on from that either once I end the phone call, it just stays black. I'm assuming you don't have any other suggestions. This Sucks
Click to expand...
Click to collapse
: / sorry. i am unsure.
maybe you have a lose connection?
sh4d0w86.

This has to be a software issue but I don't know where to start. I'm surprised nobody else has encountered this problem. I've grown frustrated of this issue because I don't understand why it's doing this. I have had the phone for almost 6 months only dropping it once 4 months ago and it wasn't a strong damaging drop that would affect anything inside. I guess I'll just have to go last resort and call warranty to swap the phone out. Thanks for the help.

Same problem
themasterhook2000 said:
This has to be a software issue but I don't know where to start. I'm surprised nobody else has encountered this problem. I've grown frustrated of this issue because I don't understand why it's doing this. I have had the phone for almost 6 months only dropping it once 4 months ago and it wasn't a strong damaging drop that would affect anything inside. I guess I'll just have to go last resort and call warranty to swap the phone out. Thanks for the help.
Click to expand...
Click to collapse
My phone also dos not come back on, when I put it in out the sreen with the power button on top, or when the phone goes to sleep. Nothing can put it back on(opening te keyboard, pulling out the stylis, presing the answer-, windows-, back- and end button). I and up using a music players too keep the phone busy what's makes it operational. Cant really remember when this started happening exactly. My phone is at the moment loaded with a standard ROM. I used too have a custom ROM.

My TP2 does this too, although I only encounter the problem sometimes when someone calls. I answer and put the phone next to my ear, the screen goes black as it should and the phone just dies. I can't hear what the other person is saying and the screen wont turn on anymore. I have to take out the battery to reboot.

set light sensor to manual in settings. You have some bad or fragmented code causing the problem. Pretty common actually, many different reasons, but usually either a bad light or proximity sensor or software issue. Setting the sensor to manual should do it, if not, hard reset and allow the phone to fully set up before touching it, to allow full customization process to complete. Search my posts on SOD (sleep of death) for more information.

Funny this was brought up. Now im worried I just dropped 250.00 and have a new one coming.
Mine started with the ear piece quit working. couldnt hear anything except on speaker.
Anyway I started having the screen issue over a month ago, only way to get it back was soft reset with the stylus. Also when the screen was lit, I couldn't hit the power button to turn the screen off. At times the screen would be on 24/7 and I just dealt with it. The times when it decieded to go to sleep was when I needed the soft reset. Well long story short I forgot my charger one day at work and the battery died. after pressing the power button for hours with no response, moving the screen in all diffrent directions as I pressed the button.It came on once after hrs of messing with it. Well today it died again and I am fed up with it so out came the tools. Once I opened it up I noticed the ribbon that feeds the screen from the mother board was worn and torn. the ribbon slides everytime the keyboard is slid out and it rubs on both sides of the phone. I thought maybe mine was just a fluke and was installed wrong considering the phone being 10 months old but now I read this and see maybe its a common problem. The cheapest I could find the Ribbon was 56.00 so I didnt want to chance it not being the issue.

S Pen Question

Hey guys,
Is there a way to completely disable the S Pen to not write/do anything when it is in the air? It drives me nuts cause i can't control it and just scribbles or clicks on things when i don't want it to. I really just want it to click and do things when it is on screen..
Cheers in advance

simple, return it for a warranty

S-Pen
Hi
Go to ‘Setting’ - ‘S-Pen’ and turn off ‘Air view’.
A question to you: Do you have the problem that I have? If the phone goes into sleep whilst I'm reading something (this only happens at night when the ‘stay awake’ camera doesn't see me) and I wake the phone with the home button I go to the home screen and not to the last viewed p-ge. The only way I get to the last viewed page is if I wake the phone with the power putton.

Pressing the home button, just wakes the phone does not take me to the home screen. May its the app you are using, I am reading a PDF using Polaris.

Dmwitz said:
Hi
Go to ‘Setting’ - ‘S-Pen’ and turn off ‘Air view’.
A question to you: Do you have the problem that I have? If the phone goes into sleep whilst I'm reading something (this only happens at night when the ‘stay awake’ camera doesn't see me) and I wake the phone with the home button I go to the home screen and not to the last viewed p-ge. The only way I get to the last viewed page is if I wake the phone with the power putton.
Click to expand...
Click to collapse
This problem occurs if you freeze S-voice or disable the "Open via home key" in S-voice settings. You can unfreeze s-voice or re-enable the open via home button to get rid of the problem.
It's annoying, I know. Happens to me as well, since I disabled the double click to open s-voice because it induces a lag in the home button.

Dmwitz said:
Hi
Go to ‘Setting’ - ‘S-Pen’ and turn off ‘Air view’.
A question to you: Do you have the problem that I have? If the phone goes into sleep whilst I'm reading something (this only happens at night when the ‘stay awake’ camera doesn't see me) and I wake the phone with the home button I go to the home screen and not to the last viewed p-ge. The only way I get to the last viewed page is if I wake the phone with the power putton.
Click to expand...
Click to collapse
I've turned that off already. It still doing it though

The tip of your spen is stuck in, most likely. I saw a video of a guy tapping the end of his spen to unstick it, kind of swinging it. Best to get it replaced though.
Sent from my GT-N7100 using XDA Premium HD app

Possible solution
This is a solution to the infamous S-Pen hover/pressing problem (where it will register a press when it's not touching the screen!)
I tried turning off air view, tried tapping and moving the pressure sensor tip... nothing seemed to fix it properly .. nothing except adjusting the potentiometers in the s-pen
The rough guide:
1. Remove the button from the s-pen (a sharp blade in the middle and levering up should do remove it but be careful it doesn't fly off somewhere unknown!.
2. Adjust the potentiometer (variable resistor) closest to the stylus tip (the writing bit). Turn it clockwise to make it less sensitive and CCW to increase it. A few degrees should be enough.
3. Replace the button - put the tongue side in towards the stylus tip and then rest the button on the stylus. Press the raised end towards the tip and down.
Test (actually you might want to test it before you do step 3!)
A big thanks to kevie88 on YouTube for suggesting it in a comment - a quick web search seemed to confirm it. I made a how to video that might help someone.
I called Samsung support and they are sending me a new s-pen anyway so I thought the above method was worth a go

[Q] App: Soft power button on edge/ticker screen ?

I've had an opportunity to play with a display model of the Note Edge recently and ultimately decided to buy one. It'll arrive on Tuesday.
The one thing that I really disliked (coming from a Note2) - is the awkward placement of the Note Edge's power button. So I was wondering if there'd be a way to add a soft power button to the edge/ticker screen -
I found a couple of options to play with which I've linked below.
https://play.google.com/store/apps/details?id=jp.co.kixx.tool.offwidget
https://play.google.com/store/apps/details?id=com.katecca.screenofflock
https://play.google.com/store/apps/details?id=dev.suriv.suscreen
https://play.google.com/store/apps/details?id=it.android.smartscreenonlite
http://www.xda-developers.com/android/wakeup-turns-on-your-screen-without-the-power-button/
That mostly addresses the 'off' part but 'on' looks relegated to being triggered by motion or the proximity sensor (because why would you want a 'screen on' app/button on any other phone - because the screen is... off).
I didn't play extensively with the Edge but if the edge/ticker screen is always on (or in a stand-by clock mode) then can someone make something that detects a swipe down and wakes the main screen? Or swipes to a shortcut that wakes the main screen?

Killiandros said:
I've had an opportunity to play with a display model of the Note Edge recently and ultimately decided to buy one. It'll arrive on Tuesday.
The one thing that I really disliked (coming from a Note2) - is the awkward placement of the Note Edge's power button. So I was wondering if there'd be a way to add a soft power button to the edge/ticker screen -
I found a couple of options to play with which I've linked below.
https://play.google.com/store/apps/details?id=jp.co.kixx.tool.offwidget
https://play.google.com/store/apps/details?id=com.katecca.screenofflock
https://play.google.com/store/apps/details?id=dev.suriv.suscreen
https://play.google.com/store/apps/details?id=it.android.smartscreenonlite
http://www.xda-developers.com/android/wakeup-turns-on-your-screen-without-the-power-button/
That mostly addresses the 'off' part but 'on' looks relegated to being triggered by motion or the proximity sensor (because why would you want a 'screen on' app/button on any other phone - because the screen is... off).
I didn't play extensively with the Edge but if the edge/ticker screen is always on (or in a stand-by clock mode) then can someone make something that detects a swipe down and wakes the main screen? Or swipes to a shortcut that wakes the main screen?
Click to expand...
Click to collapse
Hey! Glad you decided to join us edge users! About your question I'm personally using screen off and lock. I've had no problems and its working beautifully. Got it on my list of apps on the edge and even with the edge on just using it to control my music i click the button for it to turn off the screen and it does just that. It has some nice features as far as animations which i like. As far as the other apps I haven't tried them yet. Hope this helps. Have a good day

easy to do, already sorta included..... with screen off swipe up/down(one motion, do not lift finger between) on the edge screen the edge clock will activate, then swipe from right to left to pull up the app shortcuts cocktail, tap any app in the list and it will wake the main screen and app will be launched and waiting behind lock screen

nonmindo said:
easy to do, already sorta included..... with screen off swipe up/down(one motion, do not lift finger between) on the edge screen the edge clock will activate, then swipe from right to left to pull up the app shortcuts cocktail, tap any app in the list and it will wake the main screen and app will be launched and waiting behind lock screen
Click to expand...
Click to collapse
Oh, sweet. Thanks for this! I kept accidentally activating that and couldn't figure out what I was doing. Heh. I love this phone, I keep finding new things.

The easiest way around the poor power button placement is just to buy the official case so it turns on and off when you open and close the case. It really should of just came with the phone. They belong together. I bought it. It really is like a piece of the phone.

mas5acre said:
The easiest way around the poor power button placement is just to buy the official case so it turns on and off when you open and close the case. It really should of just came with the phone. They belong together. I bought it. It really is like a piece of the phone.
Click to expand...
Click to collapse
I use greenify. I long press the home button and it hibernates and turns off the screen. I've found it so much nicer than trying to mess with the power button location.
Sent from my SM-N915T using Tapatalk 2

cbucz24 said:
I use greenify. I long press the home button and it hibernates and turns off the screen. I've found it so much nicer than trying to mess with the power button location.
Sent from my SM-N915T using Tapatalk 2
Click to expand...
Click to collapse
Screen off and lock has this capability add well.
I don't mind having the power button on top, it's the switched back button and last used buttons I still can't get used to. Oh and I don't like how the home key doesn't respond to the pen without press, fail.

Lately I've set GMD gesture control to double tap for screen off. Just have to blacklist a few apps (like calculator) and keyboard where a rapid set of taps will shut screen off when you are trying to do something else. Would be nice if there was a double tap to turn screen on! Some phones can do this. But, for now, I'm fine with just pressing home button for that.

Keyboard / Touchscreen (?) Double Tap Problem - please help!!

I've been experiencing a weird issue with every keyboard app I've tried, and I would appreciate some help.
This problem started occurring only after the most recent updates. About 90% of the time that I hit the space bar on the keyboard, it registers as a double tap inserting two spaces. The phone vibrates 2x in rapid succession to indicate that two touches are being registered.
This also happens when I hold the space bar down, except the two phone vibrations are a little further apart when I hold the space bar down. This prevents me from being able to long tap the space bar (switch between language input). No other keys / apps appear to behave this way. I've tried the dialer touchscreen FW update trick as well with no success.
It's been a pain to type anything on my phone and any help would be awesome.

k186 said:
I've been experiencing a weird issue with every keyboard app I've tried, and I would appreciate some help.
This problem started occurring only after the most recent updates. About 90% of the time that I hit the space bar on the keyboard, it registers as a double tap inserting two spaces. The phone vibrates 2x in rapid succession to indicate that two touches are being registered.
This also happens when I hold the space bar down, except the two phone vibrations are a little further apart when I hold the space bar down. This prevents me from being able to long tap the space bar (switch between language input). No other keys / apps appear to behave this way. I've tried the dialer touchscreen FW update trick as well with no success.
It's been a pain to type anything on my phone and any help would be awesome.
Click to expand...
Click to collapse
Replying to my own thread here. I think I found a fix (at least for now).
I spoke with Samsung / T-Mobile service and I was able to rule out this being a software issue. I took off my screen protector and the problem still persisted, so it wasn't a screen protector issue. I then took off my case, pressed down firmly on the affected area of the screen, squeezed the top and bottom of the phone firmly together, and squeezed the sides/edges of the phone together firmly around the affected area. I have not been able to reproduce the double tapping issue since.
My best guess is that this might have been a physical issue having to do with the curved shape of the screen?
I think the mods can close this one down. Thanks.
**NEVERMIND - the issue is back. Anyone?**

Power Button worn out? Accidentally starting Camera despite clicking it only once.

EDIT: Fixed it (for now). Copied from my post on site 2.
What's up guys, I'm sorry for the late followup. It turned out, that I was too lazy to send it back. Now, almost a year later, I'd gotten into fixing phones and got the courage to open up the device and see what's up with the power button. It felt like the issue has been a bit less noticeable recently but I checked the replacement parts prices and how to open our phone up.
I think I've fixed the issue by adding one layer of electrical tape over the button-contact. I believe the issue is that the pin a just a little bit too short to reliably properly click the button.
Short tutorial:
Turn the device off and remove the simcard bracket.
It's actually super easy and you don't need to screw or remove anything. Google "Xiaomi MI A2 LITE disassembly screen battery smontaggio" you'll find a video, in the beginning the guy shows how to remove the backcover. I've used a hard, plectrom-looking "opening-pick" at the bottom, then carefully but firmly around the sites. You don't even need to remove the flex cable from the back, just make sure you don't rip it off. Cut off a short bit from the electrical tape, tape it from the battery to the contact, so it doesn't fall off. Close the case again, turn it on and check whether the powerbutton still clicks (doesn't stick) and test the screen lock. Post back if this has worked or if you've tried it.
Click to expand...
Click to collapse
Does anybody have a similar issue?
I've ordered the device from gearbest to Europe. Everything worked nicely.
However, recently when I hit the power button it sometimes triggers the double click interaction and opens my camera. I've tested a few ways to press it slightly from the side, with more force or less. However it will 1/3 times vibrate and start the camera like I had double clicked it, it's more likely when I hit it a bit too lightly though. Could it already be worn out after 2 months? This never happened when the device was new as far as I ran remember.
Yes I'm aware that I could change the camera shortcut but this doesn't stop me from worrying about whether my powerbutton will give out soon.
I was using the phone happily in the case Xiaomi has provided. Dropped the phone once and got a little scratch on the VOL Button but other than that, nothing crazy has happened. Does anyone have a clue whether they will still replace it? I'd gotten it in mid-August.

<message deleted>

Buttons are usually the main gate to "planned obsolescence". I bought this device after my nexus 5 power button started working funny (I physically removed it and worked only with gestures). So, now I try not to press the button unless necessary. I unlock with fingerprint, and lock with Greenify.
In other words. Make sure of it, if the button starts working funny, I'd file a warranty claim. Or it won't last long and warranty will expire eventually. It can happen with this device and with any other piece of tech.
My opinion.
If you do place a warranty claim, let us know how xiaomi's customer service works in Europe.

needhelpgeez said:
Does anybody have a similar issue?
I've ordered the device from gearbest to Europe. Everything worked nicely.
However, recently when I hit the power button it sometimes triggers the double click interaction and opens my camera. I've tested a few ways to press it slightly from the side, with more force or less. However it will 1/3 times vibrate and start the camera like I had double clicked it, it's more likely when I hit it a bit too lightly though. Could it already be worn out after 2 months? This never happened when the device was new as far as I ran remember.
Yes I'm aware that I could change the camera shortcut but this doesn't stop me from worrying about whether my powerbutton will give out soon.
I was using the phone happily in the case Xiaomi has provided. Dropped the phone once and got a little scratch on the VOL Button but other than that, nothing crazy has happened. Does anyone have a clue whether they will still replace it? I'd gotten it in mid-August.
Click to expand...
Click to collapse
when you dropped it
the power button may have got stuck
this is possible and I've seen it on some other devices
you can open it yourself if you don't care for warranty like i do
but the safest option is to claim warranty and yes they would replace it

needhelpgeez said:
Does anybody have a similar issue?
I've ordered the device from gearbest to Europe. Everything worked nicely.
However, recently when I hit the power button it sometimes triggers the double click interaction and opens my camera. I've tested a few ways to press it slightly from the side, with more force or less. However it will 1/3 times vibrate and start the camera like I had double clicked it, it's more likely when I hit it a bit too lightly though. Could it already be worn out after 2 months? This never happened when the device was new as far as I ran remember.
Click to expand...
Click to collapse
I have the exact same issue. It started when I installed the Oreo update, but it could be a coincidence. I'm still looking for a fix.

It also happens to me, and I didn't drop the phone... Is there a way to change the shortcut to, maybe, press the power button 3 times instead of 2?
Enviado desde mi Mi A2 Lite mediante Tapatalk

ovejota said:
It also happens to me, and I didn't drop the phone... Is there a way to change the shortcut to, maybe, press the power button 3 times instead of 2?
Enviado desde mi Mi A2 Lite mediante Tapatalk
Click to expand...
Click to collapse
It happens to me too, I disabled the shortcut and just not using it right now. I don't think there is a way to change the shortcut

It happens to me....
It happened for me as well.
And i think it's a software bug, not hardware..

avi_soft said:
It happened for me as well.
And i think it's a software bug, not hardware..
Click to expand...
Click to collapse
Same here, never crashed on the floor, it's software issue

sinthemau said:
Same here, never crashed on the floor, it's software issue
Click to expand...
Click to collapse
It obviously is not a software issue. This means that they've used cheap contact points on the button if this happens to many of us. This is a hardware issue.

marstonpear said:
It obviously is not a software issue. This means that they've used cheap contact points on the button if this happens to many of us. This is a hardware issue.
Click to expand...
Click to collapse
I'm having this issue since day one. It is obviously software, otherwise the same contact problem would occur when turning the screen ON, but it never happens. Solution is to disable the feature under System -> Gestures -> Jump to camera.

i also dissabled the camera gesture because of this issue.
im sure this is reasoned by a more or less loose power button and not an software issue

fugu5 said:
I'm having this issue since day one. It is obviously software, otherwise the same contact problem would occur when turning the screen ON, but it never happens. Solution is to disable the feature under System -> Gestures -> Jump to camera.
Click to expand...
Click to collapse
How can that be a software issue? Same issue happens to me whenever I use the power button, either to lock the screen or unlock the screen. Also if it was a software issue, it could be fixed via installing a GSI. That doesn't fix it either.

marstonpear said:
How can that be a software issue? Same issue happens to me whenever I use the power button, either to lock the screen or unlock the screen. Also if it was a software issue, it could be fixed via installing a GSI. That doesn't fix it either.
Click to expand...
Click to collapse
Let me break it down and you can tell me if I'm missing something.
1. Many users are reporting that the camera app starts when pushing the power button to turn the screen off.
2. They are not reporting any other issue with the power button, like the camera app starting when they try to turn the screen on, the button being irresponsive, or the camera app NOT starting when they deliberately push the button twice.
3. The problem reportedly goes away if the double-push gesture is turned off in settings.
Do you still think this is a hardware issue?

fugu5 said:
Let me break it down and you can tell me if I'm missing something.
1. Many users are reporting that the camera app starts when pushing the power button to turn the screen off.
2. They are not reporting any other issue with the power button, like the camera app starting when they try to turn the screen on, the button being irresponsive, or the camera app NOT starting when they deliberately push the button twice.
3. The problem reportedly goes away if the double-push gesture is turned off in settings.
Do you still think this is a hardware issue?
Click to expand...
Click to collapse
When I disable double press gesture from Gestures, still when I sometimes hit the power button, the phone locks and closes the screen and then turns the screen on again which means that it still registers one presses sometimes as double presses. Also if you've ever used a keyboard or a mouse or anything electrical with buttons on it, these appliances do the same sometimes even though you tap one button they sometimes register it twice. Which is a hardware issue. I still can't see any software issue here. When you disable the double press gesture, it doesn't launch the camera anymore but it turns on the screen after locking it (sometimes as usual)

marstonpear said:
When I disable double press gesture from Gestures, still when I sometimes hit the power button, the phone locks and closes the screen and then turns the screen on again which means that it still registers one presses sometimes as double presses. Also if you've ever used a keyboard or a mouse or anything electrical with buttons on it, these appliances do the same sometimes even though you tap one button they sometimes register it twice. Which is a hardware issue. I still can't see any software issue here. When you disable the double press gesture, it doesn't launch the camera anymore but it turns on the screen after locking it (sometimes as usual)
Click to expand...
Click to collapse
Not for me, so it's possible that these are actually two different problems with this phone. I wouldn't be surprised. :laugh:

fugu5 said:
Not for me, so it's possible that these are actually two different problems with this phone. I wouldn't be surprised. :laugh:
Click to expand...
Click to collapse
Yeah me neither. They don't look like they're going to fix anything or listen to users either. I'm happy with stock Android though.

Hi guys, for me, the problem has fixed disabling the option "Power button lock the phone", and set the option "Lock automatically": immediately.

The fix
What's up guys, I'm sorry for the late followup. It turned out, that I was too lazy to send it back. Now, almost a year later, I'd gotten into fixing phones and got the courage to open up the device and see what's up with the power button, without disabling the functionality. It felt like the issue has been a bit less noticeable recently but I checked the replacement parts prices and how to open our phone up.
I think I've fixed the issue by adding one layer of electrical tape over the button-contact. I believe the issue is that the pin a just a little bit too short to reliably properly click the button.
Short tutorial:
Turn the device off and remove the simcard bracket.
It's actually super easy and you don't need to screw or remove anything. Google "Xiaomi MI A2 LITE disassembly screen battery smontaggio" you'll find a video, in the beginning the guy shows how to remove the backcover. I've used a hard, plectrom-looking "opening-pick" at the bottom, then carefully but firmly around the sites. You don't even need to remove the flex cable from the back, just make sure you don't rip it off. Cut off a short bit from the electrical tape, tape it from the battery to the contact, so it doesn't fall off. Close the case again, turn it on and check whether the powerbutton still clicks (doesn't stick) and test the screen lock. Post back if this has worked or if you've tried it.

I changed the power/volume button assembly outright just the other day, and so far I'm not getting this issue anymore.
I recorded myself doing it here, so you can see how easy (or hard) it is: https://youtu.be/q8kaY-v0q_Q