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iPhone 8(+) iPhone 8 Plus screen brightness dims on its own

kathyricks

macrumors 6502
Original poster
Nov 26, 2012
275
17
Running 11.2.6. I have to manually turn up the screen brightness several times a day because the phone periodically and automatically turns the brightness down on its own. I do not know how to command the phone to stop doing this.

Also, emails received and read never self delete after a period of time (say one week). How do I get them to self delete after a given amount of time?

I tried using the forums Search function to get answers to these questions, but only found answers that were applicable to the iPhone X.
 

TallRed

macrumors regular
Feb 10, 2018
165
2,059
The Left Coast
Running 11.2.6. I have to manually turn up the screen brightness several times a day because the phone periodically and automatically turns the brightness down on its own. I do not know how to command the phone to stop doing this.

Also, emails received and read never self delete after a period of time (say one week). How do I get them to self delete after a given amount of time?

I tried using the forums Search function to get answers to these questions, but only found answers that were applicable to the iPhone X.

My 7+ does the same thing, but the slider both in settings and the control panel shows the brightness at max. There’s nothing I can do to turn it up. This happens most frequently outside in the late afternoon. Mornings are fine. I’ve been through the display settings and the accessibility settings and have tweaked everything I could think of to tweak. Nothing changed. I don’t get it.
 
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TallRed

macrumors regular
Feb 10, 2018
165
2,059
The Left Coast
It is a feature.

The phone protects itself by dimming the screen. The screen back lighting is a big heat producer.

iPads also will do it if outside in sunlight.

Thanks for the information. Now, as a follow up for those of us who sometimes have to work outside during the summertime, is there a case which is good for keeping an iPhone cool? Fingers crossed!
 
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Newtons Apple

Suspended
Mar 12, 2014
22,757
15,228
Jacksonville, Florida
Thanks for the information. Now, as a follow up for those of us who sometimes have to work outside during the summertime, is there a case which is good for keeping an iPhone cool? Fingers crossed!

I am afraid that a case will only make it worst. While offering safety, it will not allow the phone to radiate the heat away from the phone. I work outside and in the sun but only use my phone briefly and it has never dimmed.
 
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TallRed

macrumors regular
Feb 10, 2018
165
2,059
The Left Coast
I am afraid that a case will only make it worst. While offering safety, it will not allow the phone to radiate the heat away from the phone. I work outside and in the sun but only use my phone briefly and it has never dimmed.

It’s sounding as if there is conflicting information here. Right now, I’m typing on my iPhone which I just took out of a cooler where I had it feasting on an ice pack. The display was okay at first but now I can barely read it. In order to read it Kos, I have to tilt it away from my face. I may be making typos, but I can’t be sure. It’s aggravating.

I use my phone in the field a lot, getting and receiving texts and emails from work, mostly. Is there a long term solution for this or am I going to have to lug around a cooler and use my phone in short bursts?
 
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Newtons Apple

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Mar 12, 2014
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Jacksonville, Florida
Of you phone has been resting on a ice pack the phone will be sluggish, especially the screen. Not only that but you need to worry about the phone and condensation if it is humid. The battery will also lose capacity if you get it cold.

You are going from an overheated device to one that is now too coldo_O
 
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TallRed

macrumors regular
Feb 10, 2018
165
2,059
The Left Coast
In other words, there’s nothing to be done. If Radio Shack were still around, I could junk my expensive iPhone and get a more reliable walkie-talkie for a fraction of the price. Technology. Meh.
 
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akash.nu

macrumors G3
May 26, 2016
9,189
10,860
In other words, there’s nothing to be done. If Radio Shack were still around, I could junk my expensive iPhone and get a more reliable walkie-talkie for a fraction of the price. Technology. Meh.

Extreme conditions hardly ever play well With battery operated devices. It’s natural chemical reaction.
 
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TallRed

macrumors regular
Feb 10, 2018
165
2,059
The Left Coast
The advice I gave you is just common sense.

You lost it when you indicated you put your phone on an ice pack!!!

And here I was trying to be nice to you. I wrapped my phone in a plastic zip lock bag first. There’s nothing commonsensical about saying, “There’s nothing you can do.” It’s laziness. But far be it from me to critique a guy who fancies himself on a par with Newton.
 
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Newtons Apple

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Mar 12, 2014
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And here I was trying to be nice to you. I wrapped my phone in a plastic zip lock bag first. There’s nothing commonsensical about saying, “There’s nothing you can do.” It’s laziness. But far be it from me to critique a guy who fancies himself on a par with Newton.

LOL!

Thanks for being “nice” to me!

Enjoy your ziplock!
 
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TallRed

macrumors regular
Feb 10, 2018
165
2,059
The Left Coast
LOL!

Thanks for being “nice” to me!

Enjoy your ziplock!

Thank you! It appears to me that you are one of those guys who think you need to be an electrical engineer in order to use a cell phone, a computer programmer to use a pc, and an ornithologist in order to break an egg to make an omelet.
 
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kathyricks

macrumors 6502
Original poster
Nov 26, 2012
275
17
If it is very warm and your phone has any sun on it, it will heat up and cause the screen to dim.
My 8 Plus screen dims even in a cold, air conditioned room. The slider itself moves to the left ON ITS OWN. Also, the color temperature of the screen changes from cool (where I want it) to warm ON ITS OWN. How do I get this 8 Plus phone to LET ME decide the screen brightness and screen color temperature?

With every hardware and software "upgrade" Apple takes more and more control of its devices away from the owner!
 
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akash.nu

macrumors G3
May 26, 2016
9,189
10,860
My 8 Plus screen dims even in a cold, air conditioned room. The slider itself moves to the left ON ITS OWN. Also, the color temperature of the screen changes from cool (where I want it) to warm ON ITS OWN. How do I get this 8 Plus phone to LET ME decide the screen brightness and screen color temperature?

With every hardware and software "upgrade" Apple takes more and more control of its devices away from the owner!

The colour temperature changes because you have True Tone turned on. Turn it off under Display & Brightness. This feature is specifically for those night owls who are addicted to their smartphones. The warmer colour temperature helps to fall asleep.
 
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kathyricks

macrumors 6502
Original poster
Nov 26, 2012
275
17
The colour temperature changes because you have True Tone turned on. Turn it off under Display & Brightness. This feature is specifically for those night owls who are addicted to their smartphones. The warmer colour temperature helps to fall asleep.
True tone IS turned off. Night shift IS turned off. Low Power Mode IS turned off. Yet when I turn the screen brightness on my iphone 8 Plus to maximum it won't stay there more than a matter of minutes. My old iPhone 6 Plus did not have this problem.
 
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Newtons Apple

Suspended
Mar 12, 2014
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Jacksonville, Florida
Simply means that you phone with the backlighting turned to high is over heating the phone and dimming the backlighting. Does not matter if your 6S did not have the problem, your current phone does.

You can talk to Apple about it but they will say it is normal.
 
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Turnpike

macrumors 6502
Oct 2, 2011
429
233
New York City!
Running 11.2.6. I have to manually turn up the screen brightness several times a day because the phone periodically and automatically turns the brightness down on its own. I do not know how to command the phone to stop doing this.

Also, emails received and read never self delete after a period of time (say one week). How do I get them to self delete after a given amount of time?

I tried using the forums Search function to get answers to these questions, but only found answers that were applicable to the iPhone X.


I don't know what everyone here's issue is with their phone dimming, but the OP didn't mention overheating, just automatic dimming... and this may be the fix for that...

Go To SETTINGS --> GENERAL--> Accessibility.

Click on Display Accommodations. Turn off "Auto Brightness" which really means "auto dimmer".

Without that turned off your "to the max" brightness settings will keep dropping randomly. I suspect this is a hidden setting by Apple to make screens a tiny bit dimmer to maximize battery life. But who knows. I always feel there is an agenda when a setting is hidden and mislabeled THIS much.
 
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