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Xperia Z strange brightness issue when device temperature raises

Hello,
I noticed that when my xperia z gets warmer or hot due to a heavier use, the screen brightness fades a little and then goes back to the original value when the device temperature drops.
Autobrightness setting is turned OFF and the level is manually set at 80% brightness.
Has anyone else noticed the same ?

http://forum.xda-developers.com/showthread.php?p=39677492#post39677492
I dont know whether my problem is related to temperature or not. But in fact my phone's brightness have similar problem....

kelvin1993 said:
http://forum.xda-developers.com/showthread.php?p=39677492#post39677492
I dont know whether my problem is related to temperature or not. But in fact my phone's brightness have similar problem....
Click to expand...
Click to collapse
Yes same here, my brightness level does not increase after 85% but that's not the problem actually.
The problem appears after reaching certain temperature level, the screen dims a little and then goes back to original value when when temperature drops. I'm wondering if the running background process called " OVERHEAT CONTROL " has anything to do with it.
Maybe it is a factory setting to compensate for battery durability when in heavy use. I have reported this issue to the official SONY forums too and if there is no answer i am thinking to write directly to SONY.

Brightness level due to heat controls in sysmon.cfg file, in etc folder. This brightness dimming is really annoying me too, so i decided to change the values to my discretion. I did so on my previous phone, Xperia T, and had no problems with it. So, after this changes brightness becomes dimmer not so fast, and after a good heat. You can download attached file and take a look at changes that i done, and decide for yourself, to do or not to do. This file is from .434 f/w.
Anyway, whatever you do you do at your own risk!
I am not responsible for what your actions.

boyan.orion said:
Yes same here, my brightness level does not increase after 85% but that's not the problem actually.
The problem appears after reaching certain temperature level, the screen dims a little and then goes back to original value when when temperature drops. I'm wondering if the running background process called " OVERHEAT CONTROL " has anything to do with it.
Maybe it is a factory setting to compensate for battery durability when in heavy use. I have reported this issue to the official SONY forums too and if there is no answer i am thinking to write directly to SONY.
Click to expand...
Click to collapse
It seems that my problem is not related to temperature...do you know how to solve my problem actually?I am so confusing right now....

DennisDD78 said:
Brightness level due to heat controls in sysmon.cfg file, in etc folder. This brightness dimming is really annoying me too, so i decided to change the values to my discretion. I did so on my previous phone, Xperia T, and had no problems with it. So, after this changes brightness becomes dimmer not so fast, and after a good heat. You can download attached file and take a look at changes that i done, and decide for yourself, to do or not to do. This file is from .434 f/w.
Anyway, whatever you do you do at your own risk!
I am not responsible for what your actions.
Click to expand...
Click to collapse
Thank You very much for the info. I'll see what i can do with the config file.

kelvin1993 said:
It seems that my problem is not related to temperature...do you know how to solve my problem actually?I am so confusing right now....
Click to expand...
Click to collapse
No, not at the moment. I'll try to tweak the brightness settings and see what will come out of it. Are you satisfied with 85% brightness level ??? For me that level is quite enough bright and works nicely at daylight and even in direct sun, i can clearly see anything on my display.

Need help setting screen brightness levels

Hi ,
I flashed my Moto G titan with the latest CM 13 snapshot. took me two days and multiple attempts to get it to work with G apps, C Apps and all. Finally all set. But I notice that the screen is pretty bright even in the lowest brightness settings achievable via the slider.
I did my share of look ups and tried editing the brightness file in sys/leds/backlight. the brightness does go down but come back a bit later to the system default lowest brightness level.
Could anyone help me with modifying this via system configurations. Since the system can achieve it I would not want to use third-party apps.
And for those who are sticking to the stock ROM - The CM 13 snapshot works better .. smooth performance and better battery life.. The screen brightness if its further reducible would improve on the battery life.

Set sun brightness mode?

I think it's just not possible to manually set highest brightness of display in Android 9. But is there any way how to set it via some app or edit something?
I know there is toggle for adaptive brightness, but setting it for full brightness will just make display cca 70% of possible brightness. The 100% brightness is on only when sunlight comes to the light sensor. When I use Note9 for flying DJI drone on sunlight, I want to have 100% display brightness for that 10 minutes of flight. It's just sooo annoying that I have to use separate flashlight - shining to the Note9 sensor to have full brightness on sunny day in shadow. Otherwise, just manually set brightness is not enough for flying and reflections are stronger than display...
Thanks for ideas!

jd14771 said:
Really easy fix..
- pull down notifications
-expand all notifications
-expand brightness settings by hitting the downward facing arrow (brightness settings)
- select "show brightness settings on top"
Now you can bump up your display brightness for those 10 minutes. It would be absurd to spend any more time on an app selection
Click to expand...
Click to collapse
Thanks, but I can say I'm kind of poweruser So again - When you set brightness manually all the way up, it's just 70% of possible brightness. It still uses light sensor to detect light and if you face the sensor (still manually on full) towards the sun, ONLY THAN you'll get 100% of hardware brightness.

Haha, okay... Maybe somebody else with Note9 and experience with Samsung's "outdoor display mode" may know. Anyway, see the attached image, maybe you get that point from other user...

I've use to do it on my Note 2 this way, I don't know if it will be any help. I know what you mean, the extra brightness is there, you just want to be able to switch it manually.
https://forum.xda-developers.com/showthread.php?t=2008197

konvalink said:
I think it's just not possible to manually set highest brightness of display in Android 9. But is there any way how to set it via some app or edit something?
I know there is toggle for adaptive brightness, but setting it for full brightness will just make display cca 70% of possible brightness. The 100% brightness is on only when sunlight comes to the light sensor. When I use Note9 for flying DJI drone on sunlight, I want to have 100% display brightness for that 10 minutes of flight. It's just sooo annoying that I have to use separate flashlight - shining to the Note9 sensor to have full brightness on sunny day in shadow. Otherwise, just manually set brightness is not enough for flying and reflections are stronger than display...
Thanks for ideas!
Click to expand...
Click to collapse
There are a number of apps in the 'Playstore' that purport to do what you want.
The one that I use is called 'High Brightness Mode', it's a free app and enables you to place a widget that can be used to manually crank up the brightness to beyond the 100% shown by the brightness indicator,.
According to the instructions, it goes a lot higher if your device is 'rooted', but nonetheless works on 'unrooted devices too.

It seems rooting is the only way how ti get 100% brightness...
@jd14771 - here is the sample:

jd14771 said:
Try turning on adaptive brightness.
Click to expand...
Click to collapse
To achieve what? I want to have 100% brightness MANUALLY.
No adaptive. No automatic. No light sensor.

jd14771 said:
could have just tried turning on adaptive brightness. from what i read outdoor mode wont trigger unless you are on adaptive brightness at exactly 100% brightness.
if i had to guess its because the max brightness in the sun causes display burn in- so to limit the issue they only allow adaptive brightness to go past the 75% software max
Click to expand...
Click to collapse
Yes, but as the OP was trying to point out, the software absolute max is actually about 15-20% below the hardware absolute max capability.
This can be enabled by tweaking the sys file related to brightness, to rewrite the specific line, you need to be 'rooted'.

jd14771 said:
I have yet to see you provide instructions on how to do that.
regardless you dont need to be rooted to get the extra brightness, conditions have to be met in order to save the screen from burn in abuse. There are tons of people reporting burn in from the outdoor mode. it only make sense that only adaptive brightness can take the screen into danger territory, probably has safegaurds built in to avoid damage to this $1000 phone. so far ive provided more insight than anyone.
Beggars can't be choosers.
Click to expand...
Click to collapse
Once 'rooted' there are a number of 'Magisk/Xposed' modules that can be installed to push the brightness beyond what's available by default.
Did you want me to detail the 'rooting' and install process?
If you do a quick 'Google' you'll find a number of threads on 'XDA', 'Reddit' etc, going back a number of years which are the focus of the OP's issue.

Guys/Gals
ENOUGH with the off-topic flaming and spam posts.
Let's help each other instead of talking down.
I'll delete every flaming or spam post.

jd14771 said:
just delete the whole thread, op was flaming.
Click to expand...
Click to collapse
Since YOU'RE one of the ones I was referring to as spamming and trolling, last warning.
If the OP wants thread deleted, he can make a RP or PM me directly.
Keep spamming this thread with nonsense, and I'll get infract-happy.

konvalink said:
To achieve what? I want to have 100% brightness MANUALLY.
No adaptive. No automatic. No light sensor.
Click to expand...
Click to collapse
The brightness slider full to the right, regardless of the adaptive brightness setting is as bright as the phone gets.
How do I know this? Because e-ticket apps such as Ticketmaster and mobile payment apps like Samsung Pay go full brightness when showing barcodes, and there is no difference between manually set 100% brightness and 100% brightness when set by Ticketmaster and Samsung Pay.
The problem you are facing is caused by those who wrote the software that displays the video feed from the drone.

pTeronaut said:
The brightness slider full to the right, regardless of the adaptive brightness setting is as bright as the phone gets.
How do I know this? Because e-ticket apps such as Ticketmaster and mobile payment apps like Samsung Pay go full brightness when showing barcodes, and there is no difference between manually set 100% brightness and 100% brightness when set by Ticketmaster and Samsung Pay.
The problem you are facing is caused by those who wrote the software that displays the video feed from the drone.
Click to expand...
Click to collapse
incorrect, the sun brightness method as well as youtube and the photos app does go brighter than the screen is normally i have max brightness past the line adaptive brightness off performance mode turned on with brightness set to 10+ specifically which boosts the brightness past the normal brightness as well as vivid mode but still not the same as the brightness you get in youtube apps or on the photos app, the xperia 1 and xperia 5 does this too and i thought it was specific to them.

bradhoschar said:
Since YOU'RE one of the ones I was referring to as spamming and trolling, last warning.
If the OP wants thread deleted, he can make a RP or PM me directly.
Keep spamming this thread with nonsense, and I'll get infract-happy.
Click to expand...
Click to collapse
Seriously, man, you need to pay more attention to the threads in these forums. They are overrun with this kind of bickering now, and not a peep out of you.

gruuvin said:
Seriously, man, you need to pay more attention to the threads in these forums. They are overrun with this kind of bickering now, and not a peep out of you.
Click to expand...
Click to collapse
Please report any posts containing rule-breaking content. I assure you, we WILL see them and act on them.
Thanks!

pTeronaut said:
The brightness slider full to the right, regardless of the adaptive brightness setting is as bright as the phone gets.
How do I know this? Because e-ticket apps such as Ticketmaster and mobile payment apps like Samsung Pay go full brightness when showing barcodes, and there is no difference between manually set 100% brightness and 100% brightness when set by Ticketmaster and Samsung Pay.
The problem you are facing is caused by those who wrote the software that displays the video feed from the drone.
Click to expand...
Click to collapse
Nope

Auto brightness to low

Hi i am on gloabal stable rom and i have noticed that the brightness in low light goes to low and iff you change it manually to slightly higher it wont stick and after the phone screen is turned off and then back on the brightness in darker areas is to low again. Most android phones on Pie i have had have adaptive brightness meaning it will adapt to how you set it in each environment but on Miui i think it is different and it is also called auto brightness rather than ambient brightness. I am rooted and i have tried a couple of magisk fixes but nothing changed and in dark area it is still to dark and this is a big annoyance for me and i think it should an easy fix. Maybe someone know where the brightness values are located and can explain how to change this manually so it does not go so low in dark areas.

I have the same problem with 10.3.1 mi 9t pro

I don't have the problem anymore I moved to lineage

sam00561 said:
Hi i am on gloabal stable rom and i have noticed that the brightness in low light goes to low and iff you change it manually to slightly higher it wont stick and after the phone screen is turned off and then back on the brightness in darker areas is to low again. Most android phones on Pie i have had have adaptive brightness meaning it will adapt to how you set it in each environment but on Miui i think it is different and it is also called auto brightness rather than ambient brightness. I am rooted and i have tried a couple of magisk fixes but nothing changed and in dark area it is still to dark and this is a big annoyance for me and i think it should an easy fix. Maybe someone know where the brightness values are located and can explain how to change this manually so it does not go so low in dark areas.
Click to expand...
Click to collapse
Somebody on forum said that you have to train your adaptive brightness. Every time it is too low you bring it up with slider and after few times it should learn your preferences. I didn't yet try this, but I will...

Usually on Android it works like that but on miui its called auto brightness rather than adaptive brightness and didn't work in the same way.

Any news on this? Does it work on MIUI 11 / Android 10 better? I love this phone but this issue is really annoying.

I'm on miui 11 EU it works perfectly.

sam00561 said:
I'm on miui 11 EU it works perfectly.
Click to expand...
Click to collapse
Awesome, thanks for that, great to hear your problem is gone after the upgrade!

Codeman2000 said:
Awesome, thanks for that, great to hear your problem is gone after the upgrade!
Click to expand...
Click to collapse
sorry which problem are you refering to please.

The automatic brightness issue - it's mostly too dark in darker rooms.

https://forum.xda-developers.com/showpost.php?p=81436013&postcount=6

Question Auto brightness too low

Hello, 3 days ago I bought oppo x3 pro. Phone is awesome, but auto brightness works very bad... It keep decreasing screen brightness to very low level.
I never seen something like that, Samsung S20 works much better, well, even realme x50 works normal. To use phone I had to disable auto brightness. Is there anything like adaptive screen brightness, I read somewhere that samsung by the time learn my preferences, and keep good brightness. Tired this with oppo for 3 days, but seems it doesn't have that option.

troxter said:
Hello, 3 days ago I bought oppo x3 pro. Phone is awesome, but auto brightness works very bad... It keep decreasing screen brightness to very low level.
I never seen something like that, Samsung S20 works much better, well, even realme x50 works normal. To use phone I had to disable auto brightness. Is there anything like adaptive screen brightness, I read somewhere that samsung by the time learn my preferences, and keep good brightness. Tired this with oppo for 3 days, but seems it doesn't have that option.
Click to expand...
Click to collapse
If it is the same mechanism as in OnePlus (not sure about it) - then the phone will "learn" after you manually set the brightness to proper level. Give it 2 weeks.
Btw. Rydzyk in avatar, hope youre not the real one

Real Tadeusz here
I was teaching for 3 days, but without success. Will try for a week now
thanks

Try clearing system cache and data in the relevant apks.
Test the light level sensor to see if it falls within an acceptable range.
I use manual brightness control almost always; doing so saves battery, retinas and sanity.
It also reminds you when it's too bright and your frying your display.

Same here. Helped me out with Lux Brightness and set the minimum brightness to 30. Works fine for me.

To me in Realme 8 it seems to have learn a minimum value for auto brightness instantly, I just set a minimum a little above of the default level (It was very low), and the phone remember that level onwards

well, mine surely isn't 'learning', it keeps defaulting to the lowest value, which is waaay to low.
Are there any alternatives to Lux Brightness that you know off?

latino147 said:
well, mine surely isn't 'learning', it keeps defaulting to the lowest value, which is waaay to low.
Are there any alternatives to Lux Brightness that you know off?
Click to expand...
Click to collapse
What happens to me is that the default auto brightness deactivates itself when it wants, and reactivates also when it wants, very annoying. So I deactivated manually the auto brightness and tried Velis Auto Brightness, this app is a little complicated but works quite well, just you have first to understand the app itself and then tweak a little to your convenience. It has a little bug in Android 11, the notification of lux and % of brightness screen disappears after some time but doesn't affect the app itself. Take a look https://play.google.com/store/apps/details?id=com.velis.auto.brightness

josejoa said:
What happens to me is that the default auto brightness deactivates itself when it wants, and reactivated also when it wants, very annoying. So I deactivated manually the auto brightness and tried Velis Auto Brightness, this app is a little complicated but works quite well, just you have first to understand the app itself and then tweak a little to your convenience. It has a little bug in Android 11, the notification of lux and % of brightness screen disappears after some time but doesn't affect the app itself. Take a look https://play.google.com/store/apps/details?id=com.velis.auto.brightness
Click to expand...
Click to collapse
Thanks! I'll check it out