Display brightness - Huawei P20 Pro Questions & Answers

Each time I set the brightness to max I find that each time I need to redo it when I switch my phone back on and have noticed the slider in the settings gose down by itself and that the box is ticked dose anyone else have this problem and if so is there a fix or is to a software problem that needs an update to fix.
Thank you in advance.

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Brightness issue

Hi all,
For some reason, my Hero's screen would not go pass the lowest brightness setting. At first I thought that the original screen was the issue, but I've replaced that and it's still happening. If I increase the brightness slightly, it would start flickering, and if I increase it a lot it would flickers and then goes out (but everything still works, I just have to blind slide the bar down to the lowest brightness setting). Also I can not see the boot screen/recovery/anything before the lockscreen, which means I can't flash a ROM without using ROM manager.
Has anyone ever had a problem like this or know what's causing the problem and how I can fix it? I appreciate all the help. Thank you!

Auto Brightness problems?

Auto brightness seems to behave very unpredictably--when I wake my phone and unlock/use it, it will remain at dimmest setting (too dim), and will seemingly randomly move to a more appropriate brightness (not with intense activity, it's really random), and will again randomly revert to dim setting (not with stoppage of activity).
Is auto brightness messed up with android or the note, and how can I fix it? Just set a manual brightness level?
Running cassie x lite rom and latest franco kernel btw.
No advice about this anyone?
Automatic brightness issue
Hello Friends, I have a similar problem as the OP, octavian90.
For my Galaxy Note, following the sequence below,
Applications > Settings > Display > Brightness
By default the slider for Automatic brightness is towards the middle/centre.
I have unchecked Automatic brightness and calibrated the slider to the extreme left.
I have come across the following strange observations -
1] When I unplug my device after charging, the slider resets to the default level.
2] After I recalibrate it to the extreme left once again and make a phone (voice) call, the slider resets to the default level over again.
Is this normal behaviour or does my device actually have a problem? I am very confused and worried. The device is not even a month old.
Eagerly awaiting your expertise. Thank you octavian90 for initiating this topic.
Friends, awaiting your much needed replies to my queries above.
Have you disabled the screen saver or what its called that adjust the brightness automaticly.? Works like a auto brightness but it can adjust some things brighter and some dimmer eaven on same light....
I just checked my settings and the have the slider all the way to the right because last time I manually adjusted brightness for reading in full daylight. It is currently on automatic brightness (I prefer that setting and don't find it changes too often or too laggy)
I just then manually adjusted slider to about 20% from left while on USB charge then turned automatic back on again. I then removed charger and it still shows automatic and slider about 20% from left.
Could be a ROM/Kernel issue? I am using Rocket ROM with Franco Kernel.
I don't think the position of the slider matters when backlight is set to auto. Or does it?
Sent from my rooted Galaxy Note using XDA Premium App
altae said:
I don't think the position of the slider matters when backlight is set to auto. Or does it?
Sent from my rooted Galaxy Note using XDA Premium App
Click to expand...
Click to collapse
No it doesn't matter when on autobrightness. But it should remember the last manual setting chosen so not sure what is causing that glitch.
Hm never really paid attention to the behaviour of the slider. I will take a look and report back how mine works.
Sent from my rooted Galaxy Note using XDA Premium App
What I found out: On my device the position of the slider before activating auto mode is completely irrelevant because as soon as I activate the auto mode the slider is reset to its middle position.
Sent from my rooted Galaxy Note using XDA Premium App
Interesting - just turned autobrightness of and you are right - slider went to the middle. Must be by design then. Problem solved
SoonHD2 said:
Have you disabled the screen saver or what its called that adjust the brightness automaticly.? Works like a auto brightness but it can adjust some things brighter and some dimmer eaven on same light....
Click to expand...
Click to collapse
Sorry SoonHD2, I did not understand what you meant. I am confused with the screensaver part you stated.
A humble request for an explanation, if required. Thank you.
altae said:
What I found out: On my device the position of the slider before activating auto mode is completely irrelevant because as soon as I activate the auto mode the slider is reset to its middle position.
Click to expand...
Click to collapse
This happens with my Galaxy Note as well. Thus, it seems like it is meant to be this way.
I will keep an eye on this and report if and when the Auto brightness slider acts differently.

[Q] Wake up for power button stopped working - Nameless ROM v7.2 Build 5 - 806Mhz

Hi All,
I've just rooted my phone (my first root) and installed Nameless ROM v7.2 Build 5 with the 806Mhz image. Right after that everything seemed to be fine. But later on the wake up function for pressing the power button stopped working.
The symptoms: Phone goes to sleep mode for pressing the power button (screen goes blank), but when I press the power button again nothing happens, the screen remains blank. If I press it twice in fast succession, the lock screen appears for a fraction of a second then again it goes blank. The only way I can get to the lock screen is if I start charging it, then I remove the USB cable, and press the power button. (but it only works right after that) Pressing the power button also works the very first time after automatic timeout.
I'd appreciate any ideas on how this could be fixed as besides that Nameless and the OC image seems to be rather awsome.
Hi, Well there could be many reasons why your phone won't wake, to rule out one does the power button defiantly work?
If it does it could be that your cpu goes too low in clock speed to sustain waking the phone, I think you should try to get an app called setcpu which is found on xda for free and higher the lowest clock speed like so:
806mhz-806mhz
806mhz-4xxmhz
806mhz-xxmhz
then 806mhz and the lowest one
Doing this will let you figure out if it is infct the cpu causing this, post back with your results.
Good luck.
russell664 said:
Hi, Well there could be many reasons why your phone won't wake, to rule out one does the power button defiantly work?
If it does it could be that your cpu goes too low in clock speed to sustain waking the phone, I think you should try to get an app called setcpu which is found on xda for free and higher the lowest clock speed like so:
806mhz-806mhz
806mhz-4xxmhz
806mhz-xxmhz
then 806mhz and the lowest one
Doing this will let you figure out if it is infct the cpu causing this, post back with your results.
Good luck.
Click to expand...
Click to collapse
I've tried setcpu with the four settings listed above and the scaling parameter set to default (ondemand). The problem persists.
To answer your question: the power button definitely works, I can lock the screen with it, initiate shutdown/reboot, it only doesn't function properly when I try to wake up the phone with it. I've also noticed one thing: the 'charging via USB'-'unplug'-'press power' unlock method only works if I don't wait too much after unplugging.
I've tried insalling a different locker (Holo locker) and I wasn't even able to unlock the phone anymore.
Can the htc locker itself be corrupted? Can it be somehow reinstalled?
FYI: I have Autokiller installed but it's currently set to system defaults. Also my battery isn't calibrated yet (I'm not sure if that's relevant). And I have Llama installed and running in the background.
Can it be related to the System off and lock app? It is installed but it doesn't have root access.
Thanks in advance for your help!
This might not be related , but could you tell me what display brightness level you are currently using? If you are not using auto brightness try using that option and retry locking and unlocking the device.
Might be also due to the screenoff app.Try uninstalling it.
nikhil16242 said:
This might not be related , but could you tell me what display brightness level you are currently using? If you are not using auto brightness try using that option and retry locking and unlocking the device.
Might be also due to the screenoff app.Try uninstalling it.
Click to expand...
Click to collapse
Thanks for that nikhil, you've just saved my phone . The issue seems to be solved now. I've also tried with all the brightness settings you can set up with the Power widget - all of them works fine. But if I tweak brightness in the Notification bar - Quick settings, the problem appears again. I guess I'll avoid that slider in the future.
Thanks again!
Novbert said:
Thanks for that nikhil, you've just saved my phone . The issue seems to be solved now. I've also tried with all the brightness settings you can set up with the Power widget - all of them works fine. But if I tweak brightness in the Notification bar - Quick settings, the problem appears again. I guess I'll avoid that slider in the future.
Thanks again!
Click to expand...
Click to collapse
I had a similar problem when i was on stock rom and after a lot of searching found out that it was related to the brightness level we set (Dont know why this problem arises though)
So...Happy to help
The problem is linked to the brightness level
As pointed out by a member 2, this issue is related to the brightness level we set on this phone. I used to have the same problem when i changed the brightness level to the minimum but eversince i increased the brightness just a fraction the problem seems to have dissappeared.
I still dont why it happens
Just a question...
Did anyone having this problem commit a "dirty" flash or any other ROM flashing that didn't involve a full wipe? This may explain this conundrum.

[Q] Autobrightness Problem

Hi, got an HTC one recently but i'm having problems with autobrightness seems like the low brightness setting for for phone turns screen completely off. I went to brightness setting manually and drag the slider to the lowest point but the screen will completely turn off just before it reaches the last point so i downloaded lux from the store and checked it the screen while turn off below 15 lux. So my question is, is this a hardware defect or can i install firmware or anyother software to calibrate the light sensor? thanks guys.

(NVM) Can't Change Brightness after latest AT&T update

Brightness slider has completely disappeared from notification window. And the slider inside settings doesn't work and is greyed out. What the heck is happening? Did Samsung or AT&T think manual brightness options are unnecessary now?
EDIT: turns out the brightness control is disabled when low battery. Ran the phone for two days now without a charge so yeah. Didn't know that.

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