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My iPhone 8 Plus constantly dims the screen by itself..?!

Turnpike

macrumors 6502
Original poster
Oct 2, 2011
429
233
New York City!
Is this a bug, a feature, or am I overlooking something?

I want it as bright as it can be, all the time. I turn off auto adjust, I turn off true tone, I turn off any automatic adjustments I notice, but 10 times a day I get a notice on my phone, and I can see the screen is dimmer than it was when I last used the phone. I swipe up, and sure enough, the slider is down by about 20% from the top.

How do I keep this from happening? It's annoying and I need the phone on it's brightest setting all the time. Is it a bug, or a feature, or something I can turn off?

Thanks in advance...
 

Turnpike

macrumors 6502
Original poster
Oct 2, 2011
429
233
New York City!
Is it in Low Power Mode when this happens?

No, not low power mode, no auto adjusting, it's like it automatically turns down to 80% brightness after 5 or so minutes of use.
[doublepost=1508351937][/doublepost]
It’s protection from overheating. Nothing you can do about it.

Definitely nothing to do with overheating whatsoever. The screen on an idle iPhone goes to 80% brightness constantly.
 
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defboob

macrumors regular
Jun 17, 2008
104
44
This is something dumb with iOS 11. Go to Settings —> General —> Accessibility —> Display Accommodations

Then make sure that auto brightness is turned off here. Once that is off, the brightness slider from the control center will always remain where you set it at. At least that’s what has worked for me with an iPhone 7 Plus.
 
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johnny hotsauce

macrumors regular
Nov 7, 2011
110
66
This is something dumb with iOS 11. Go to Settings —> General —> Accessibility —> Display Accommodations

Then make sure that auto brightness is turned off here. Once that is off, the brightness slider from the control center will always remain where you set it at. At least that’s what has worked for me with an iPhone 7 Plus.

I have the same issue as the OP on my iPhone 8+ and i did what you suggested the day after I got the phone 3 weeks ago and the display brightness still changes on me automatically, usually lowering it, almost as if auto brightness is on but it isn't, at least that what the setting on phone says.
 
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Chloros

macrumors regular
May 4, 2016
171
321
My 7+ will dim all the way down randomly. I changed all the settings and it continues to do so. I have the latest ios.
 
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Turnpike

macrumors 6502
Original poster
Oct 2, 2011
429
233
New York City!
This MUST be a bug in the software then, my iPhone 7 Plus does it too now, once I updated to IOS 11. VERY annoying.
 
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Turnpike

macrumors 6502
Original poster
Oct 2, 2011
429
233
New York City!
This is something dumb with iOS 11. Go to Settings —> General —> Accessibility —> Display Accommodations

Then make sure that auto brightness is turned off here. Once that is off, the brightness slider from the control center will always remain where you set it at. At least that’s what has worked for me with an iPhone 7 Plus.

>>>>>>>>>>>The Above is a quote from user "defboob". >>>>>>>>>>

UPDATE! THIS IS CORRECT! AND FIXED MY PROBLEM IN BOTH PHONES. This was some weird setting that's both new and unheard of, thanks so much "defboob" for the solution! It worked for me on BOTH PHONES.
 
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Clayford

macrumors newbie
Mar 26, 2018
1
0
It’s protection from overheating. Nothing you can do about it.
[doublepost=1522117643][/doublepost]Yes! When I play like 30mins on my iPhone 7+ it keeps dimming my screen everytime I feel it’s hot. I guess it’s a feature you can’t change...
 
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pechfus

macrumors newbie
Dec 3, 2018
1
0
Nevada
Is this a bug, a feature, or am I overlooking something?

I want it as bright as it can be, all the time. I turn off auto adjust, I turn off true tone, I turn off any automatic adjustments I notice, but 10 times a day I get a notice on my phone, and I can see the screen is dimmer than it was when I last used the phone. I swipe up, and sure enough, the slider is down by about 20% from the top.

How do I keep this from happening? It's annoying and I need the phone on it's brightest setting all the time. Is it a bug, or a feature, or something I can turn off?

Thanks in advance...
[doublepost=1543853358][/doublepost]Here's what I found out. Don't now why, but if I take it out of the case, it stays bright all the time. Try it.
 
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Sevo_97

macrumors newbie
Jul 5, 2019
2
0
This is something dumb with iOS 11. Go to Settings —> General —> Accessibility —> Display Accommodations

Then make sure that auto brightness is turned off here. Once that is off, the brightness slider from the control center will always remain where you set it at. At least that’s what has worked for me with an iPhone 7 Plus.


I’ve tried that, but it still gets dim by itself. Like I’ll be playing pubg mobile with the brightness slider all the way up, and it would still go down after 5-10 minutes in a match. And I even have auto brightness off too. It gets really annoying and I have a higher chance of losing the game because of this.

It has to be a bug or probably some dumb feature that lowers brightness when phone heats up. I am still on iOS 11.3.0 on my iPhone 6s
 
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Applefan4

macrumors 6502
May 6, 2013
488
463
It's working as intended... it's to protect your phone from overheating as it has no active cooling.

Phones aren't really meant for gaming, if you are after that, get a decent gaming PC or a playstation.
 
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Sevo_97

macrumors newbie
Jul 5, 2019
2
0
It's working as intended... it's to protect your phone from overheating as it has no active cooling.

Phones aren't really meant for gaming, if you are after that, get a decent gaming PC or a playstation.


But it never used to do this before. Like the first couple of months that I had the phone would always stay where I wanted the brightness to stay. But now it drops brightness even with auto brightness off.

It’s been a year and a half I have my 6s now and for some reason it’s starting to lower without my will
 
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kyleupfront

macrumors newbie
Aug 11, 2019
1
0
This is something dumb with iOS 11. Go to Settings —> General —> Accessibility —> Display Accommodations

Then make sure that auto brightness is turned off here. Once that is off, the brightness slider from the control center will always remain where you set it at. At least that’s what has worked for me with an iPhone 7 Plus.
[doublepost=1565553482][/doublepost]not an iOS 11 issue. Still an issue. iPhone 8 Plus here
This is something dumb with iOS 11. Go to Settings —> General —> Accessibility —> Display Accommodations

Then make sure that auto brightness is turned off here. Once that is off, the brightness slider from the control center will always remain where you set it at. At least that’s what has worked for me with an iPhone 7 Plus.
 
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Rodan52

macrumors 6502
I know this thread is a bit dated having been started in 2017 but the exact the same issue is occuring with my wife's one year old iPhone XS running iOS 13.3.1 so it's probably not software related but all I can find in a web search all seems at least a year old.
Is anyone still suffering from this issue or has it been resolved in some way. Most of what I read seems to suggest it is a heat related problem due to level of activity.
Does anyone have any new views on the issue.
 
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TinaLeach

macrumors newbie
Mar 10, 2020
2
0
I know this thread is a bit dated having been started in 2017 but the exact the same issue is occuring with my wife's one year old iPhone XS running iOS 13.3.1 so it's probably not software related but all I can find in a web search all seems at least a year old.
Is anyone still suffering from this issue or has it been resolved in some way. Most of what I read seems to suggest it is a heat related problem due to level of activity.
Does anyone have any new views on the issue.
I've been having the same issue for a few weeks now with my iphone X. I've disabled every auto adjust option I could find. And still, I'll be using it and *dim* and then it later decides to go back to normal with no real reason. I'm also noticing that my battery is dying a lot quicker. Dunno if that's part of it.
 
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Rodan52

macrumors 6502
I've been having the same issue for a few weeks now with my iphone X. I've disabled every auto adjust option I could find. And still, I'll be using it and *dim* and then it later decides to go back to normal with no real reason. I'm also noticing that my battery is dying a lot quicker. Dunno if that's part of it.
Hi Tina, I think I have pretty much nailed it down to overheating. Does your X get hot? (Talking about your phone here?) The fact that you mention the battery going flat faster also fits. Have a look at your Battery in Settings. Below the Health stats you will see a Battery Usage By App list, this gives you a pretty good idea of what's been using all your power. When I checked my wife's XS during a dimming phase I found she had 15 other app windows open in the background. Closing all but the one she was using restored the screen brightness in about 5 min. Another thing is a case if you have one. My wife has a rather thick neoprene case with gold sparkles imbedded in a clear surface. A bit bling I know but she says it makes it easier to see in her handbag. I suggested she try without a case for a few days and she hasn't had a problem since. So why not perform this little test. When your screen dims, take off the case if you have one and pop the phone in the fridge (not the freezer) give it say 2 min or less and see if it has reverted to bright.
 
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TinaLeach

macrumors newbie
Mar 10, 2020
2
0
It has seemed warmer than usual. Since I commented I have noticed that it seems to be better when I take the case off.
I’ll try the other suggestions. Thanks!
 
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