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Screen won't turn on when pressing the power button

Hello there,
I got my hands on a M7, which was fully stock and working. It has some minor scratches and damaged material here and there, though it worked fine, except for phone calls only being audible in speaker mode.
I flashed TWRP recovery and installed the latest nightly of Cyanogen mod (cm-12.1-20151005-NIGHTLY-m7). Though to prevent the custom recovery from being patched I unlocked the bootloader (Not sure if that was the solution, though).
It was all fine, until the screen dimmed, and I tried powering on the screen again by pressing the power button. Though it wouldn't turn on. I even tried setting on the option to turn on screen when connected to a power source, though it never powered on again. I also noticed a slight flash of blue light every now and then, and the screen feels too sensitive. It might register a press when you're just scrolling.
Could someone help me out with this? Of course I believe a hardware fix would be appropriate, but as how everything worked until the flashes, I believe it might be fixed with some software.
Any help is much appreciated.

Byrkoet said:
Hello there,
I got my hands on a M7, which was fully stock and working. It has some minor scratches and damaged material here and there, though it worked fine, except for phone calls only being audible in speaker mode.
I flashed TWRP recovery and installed the latest nightly of Cyanogen mod (cm-12.1-20151005-NIGHTLY-m7). Though to prevent the custom recovery from being patched I unlocked the bootloader (Not sure if that was the solution, though).
It was all fine, until the screen dimmed, and I tried powering on the screen again by pressing the power button. Though it wouldn't turn on. I even tried setting on the option to turn on screen when connected to a power source, though it never powered on again. I also noticed a slight flash of blue light every now and then, and the screen feels too sensitive. It might register a press when you're just scrolling.
Could someone help me out with this? Of course I believe a hardware fix would be appropriate, but as how everything worked until the flashes, I believe it might be fixed with some software.
Any help is much appreciated.
Click to expand...
Click to collapse
If you are talking about the screen not turning on (as opposed to the complete phone) Its a known bug of CM roms. The screen can't be turned back on when it was set to minimum brightness, or when the auto brightness set it to minimum. To avoid that, you'll need to adjust the brightness yourself instead of auto mode, avoiding the minimum adjustment. CM is known to be a buggy rom for the M7, you shouldn't have this issue if using a GPE or Sense rom.

alray said:
If you are talking about the screen not turning on (as opposed to the complete phone) Its a known bug of CM roms. The screen can't be turned back on when it was set to minimum brightness, or when the auto brightness set it to minimum. To avoid that, you'll need to adjust the brightness yourself instead of auto mode, avoiding the minimum adjustment. CM is known to be a buggy rom for the M7, you shouldn't have this issue if using a GPE or Sense rom.
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Click to collapse
Thanks for the info. I figured as much, I will try Exodus.
EDIT: I have tried Exodus, XenonHD and Dirty Unicorns. Though no success: none of them were able to turn on the display after it dimmed.

Extremely unresponsive when trying to unlock with pattern

After upgrading to Lineage OS 15.1, I realize that if I have screen lock set to pattern, then it is extremely hard to unlock when the screen has been off for a while. The screen will stay black while when I'm holding power button the phone will vibrate as if I'm calling power menu. This black screen can last at least one minute. I also set long press to open flashlight when screen is off and that doesn't work. Those symptoms makes me believe that the phone is awake, yet for some reason can't get GUI rendering. Sometimes even when I enter the correct pattern and the animation moves dots and timer away, I can still draw unlock pattern on the hiding unlock dots, and phone will vibrate in a very laggy manner.
Currently I'm running with no screen lock as even "swipe" still cause the unlock process to be very painful. Is this a known issue for LOS or is there a way to fix it? I saw a post says the battery should be replaced if phone is laggy. Is that a possible cause?

LolitaPlus said:
After upgrading to Lineage OS 15.1, I realize that if I have screen lock set to pattern, then it is extremely hard to unlock when the screen has been off for a while. The screen will stay black while when I'm holding power button the phone will vibrate as if I'm calling power menu. This black screen can last at least one minute. I also set long press to open flashlight when screen is off and that doesn't work. Those symptoms makes me believe that the phone is awake, yet for some reason can't get GUI rendering. Sometimes even when I enter the correct pattern and the animation moves dots and timer away, I can still draw unlock pattern on the hiding unlock dots, and phone will vibrate in a very laggy manner.
Currently I'm running with no screen lock as even "swipe" still cause the unlock process to be very painful. Is this a known issue for LOS or is there a way to fix it? I saw a post says the battery should be replaced if phone is laggy. Is that a possible cause?
Click to expand...
Click to collapse
This isn't a known problem.
From what did you upgrade?
Which build are you using?
Did you do a clean install?
Which gapps are you using.
Do you have Expanded Desktop enabled?

Elektroschmock said:
This isn't a known problem.
From what did you upgrade?
Which build are you using?
Did you do a clean install?
Which gapps are you using.
Do you have Expanded Desktop enabled?
Click to expand...
Click to collapse
I was using Stock Android before, but I fully wiped everything before I install.
15.1-20180508-NIGHTLY-shamu
Yes.
I got my GApps from Open GApps, but didn't remember which variant but most likely nano.
I actually have this enabled. I'm gonna disable it and see how that works.

After turning off Expanded Desktop the issue seems to be gone. Though when turned on again after some times the lag is still somewhat exist.

there's a Xposed module fix for this http://repo.xposed.info/module/fr.merams.r.deepscreenoreo

Auto brightness issue

Anyone else having issues with auto brightness after the pie update? My phone sometimes does not change the brightness automatically when I move from a bright to dark environment until I turn the feature off and on again.

poppyjay said:
Anyone else having issues with auto brightness after the pie update? My phone sometimes does not change the brightness automatically when I move from a bright to dark environment until I turn the feature off and on again.
Click to expand...
Click to collapse
go to a dark place slide the brightness to desired level. no go under a bright ligh then shut it off and see.

Just tried this. Sometimes it works and sometimes it doesn't. When it doesn't I still have to turn it off and on again for it to work again.

it's the new adaptive brightness..... you set the desired light in each situation over the next few days using the slider (adaptive ON)... it will adapt to your preferences in different situations.....

edwardob said:
it's the new adaptive brightness..... you set the desired light in each situation over the next few days using the slider (adaptive ON)... it will adapt to your preferences in different situations.....
Click to expand...
Click to collapse
Thanks I'll give it a try.

Doesent work with my note 9 Pie...
I Flashed ota from 8.1 and later i flashed back to 8.1.
Later i flashed again 9.0 but this time not via ota. I flashed it clean via odin.
Same issues with adaptive brightness :
1. It does NOT learn my pattern. This means : I turn it darker. And later in the same spot it turns it back to the middle... Over days and days the same.
2. If you turn on the camera-app, it turns the brightness high. That is okay, i like that. But if you turn the app off, and if you are too fast for the system, it stays enlighten untill u lock ur device !
Oreo :
1. It learns my pattern from day one (!). I turn it darker. Later on the same spot : It stays dark ! Perfect
2. Turn on the camera app and it got brighter. Nice, like Pie, right ? Yes, but turning the camera-app off and swiping it instand away from recent apps, it turns imediatly back to the normal brightness, it learned from you !
I hate it ! Pie does not work fine with my brightness preferences !
Other user in other forums have the same issues with pie...
And there is no way around. I tryed it all. Every option and every possibility. Iam not a beginner in android.
I gave the adaptive brightness a cance of 10 Days, but every day it learned nothing. And the Camera problem...Turn the app on and open recent apps and swipe the camera away and then go back to home. If u do it too fast (I do it every time on every phone with MY speed) it stays bright like u throw it in the sun

Same here adaptive brightness has gone bonkers for me after pie upgrade. Just like you it works when it wants to. Really frustrating.

So please guys, tell samsung that problem in the members app.
The users in our german forum did that, and i did that too.

fingerprint while display is off

I noticed that I can unlock the redmi k20 pro while the display is off. if I hit the fingerprint spot, the screen glows green on the corresponding area and it unlocks. (really conviniend)
Is this a 7th gen sensor feature, or do more phones have it? Or is it simply software?
A friends op 6t needs the display to be on for the fingerprint sensor to start checking, so I got curious.
Edit:
I mean under display fingerprints.

On pocof1 fingerprint reader was also always on , on my k20pro it also always on. when i had lineage installed on poco then you had to wake the screen to unlock so i think it software thing to have it always running in background

ef1x said:
On pocof1 fingerprint reader was also always on , on my k20pro it also always on. when i had lineage installed on poco then you had to wake the screen to unlock so i think it software thing to have it always running in background
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Click to collapse
Yeah, normal capacitive fingerprints should always work while the display is off, I was wondering about under display ones.

Also i saw option to enable like aod but with fingerprint reader that it always shows on locked screen

fingerprint reader freezes, wont register, and not responding

I bought my mi 9 2 days ago and it all worked fine. But today I've noticed that sometimes it will not register a touch, it stays as a fingerprint icon. Also, there was about 2 times it froze, like the icon froze while it was scanning, I had to unlock the phone by pin to get rid of it. Sometimes, I also notice that I have to press multiple times to get it to read, my finger is dead centre of the reader, but I still have to touch it multiple times. Anyone having the same issue or has a solution?

I also deleted and reregistered my finger multiple times. I'm on 10.2.13.0, btw.

I had this too until I added the same finger multiple times. Add the finger you are most comfortable with using as many times as you can.
When I do this it works almost every time, perhaps 19 out of 20.

10.2.13 here too.
I am able to reproduce the problem most of the times: having the phone in my pocket, I take it out and try to unlock. The reader does not respond, or it just lights and goes off cyclically as if it was retrying, yet no retry notification. If I doubletap to activate lock screen, it works like a charm.
Activating the rotation gesture to activate the unlock screen mitigates this, but other problems arise. If the phone is on the table, the only solution is to doubletap or to hit power to activate the unlock screen.
I read somewhere that it is a wakelock issue. I deoptimized the energy in the biometrics app via miappa, but the problem is still there.
Any solution?

chospo said:
10.2.13 here too.
I am able to reproduce the problem most of the times: having the phone in my pocket, I take it out and try to unlock. The reader does not respond, or it just lights and goes off cyclically as if it was retrying, yet no retry notification. If I doubletap to activate lock screen, it works like a charm.
Activating the rotation gesture to activate the unlock screen mitigates this, but other problems arise. If the phone is on the table, the only solution is to doubletap or to hit power to activate the unlock screen.
I read somewhere that it is a wakelock issue. I deoptimized the energy in the biometrics app via miappa, but the problem is still there.
Any solution?
Click to expand...
Click to collapse
Flash a custom rom. Xiaomi.eu fixes alot of problems with MIUI 10

kaydentc1 said:
Flash a custom rom. Xiaomi.eu fixes alot of problems with MIUI 10
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Click to collapse
What's the latest EU ROM version for the Mi 9? I'm a little bit confused on their site.

RebornCheiko said:
What's the latest EU ROM version for the Mi 9? I'm a little bit confused on their site.
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Click to collapse
Get the latest pie build. 9.8.1