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RecentlyConverted

macrumors 6502a
Original poster
Oct 21, 2015
832
593
Hi,

After downloading the first PB of iOS11 on my 6S Plus I noticed the screen was substantially darker. Today I am running the latest PB and the screen seemed rather dark ( outside at the time). I did an experiment and turned off auto-brightness on that phone and iPhone 6 Plus running iOS 10 and set both to max brightness. The iPhone 6 is easily twice as bright as the 6. Is this a phone or OS issue?

Thanks
[doublepost=1502721444][/doublepost]Oops I found it. Some how when installing iOS11 Reduce White Point was activated.
 

psionicsin

macrumors 6502
Dec 6, 2011
281
119
Metro-Detroit, MI
OMG you saved me with this! I thought I was going crazy. I kept sending bug report after bug report and saw no signs of this getting fixed. Somehow it got activated in mine also. I would've NEVER done something like this lol.

It was even doing this weird "stepping" from original light sometimes, back to dark. Thought I had a busted iPhone or something.
 
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CloudSpeaker

macrumors newbie
Sep 26, 2016
18
15
Not Quite Phoenix
Seconded... And heartily!

Since Beta 4, I kept manually inching up the brightness in Control Center only to notice my screen dim again a short time later, like it was actively pushing back. I've never touched Reduce White Point in Settings, but it was activated. Problem instantly fixed!
 

symphony

macrumors 68000
Aug 25, 2016
1,537
1,778
I thought that was an iPhone 7 thing because people have said since the iPhone 7 has a brighter screen, the phone will flash back to dark to prevent screen damage
 

RecentlyConverted

macrumors 6502a
Original poster
Oct 21, 2015
832
593
I am glad it helped you all.

I too had sent bug reports, but today my screen was so dark I was determined to get to the bottom of it.

If I hadn’t found this soloution I was going to backup and restore to iOS 10 to see if that fixed it. If not I was off to the local service agent.

Luckily I found this setting, I could just imagine my embarresment handing over my “faulty phone” only for them to show me this fix ( if they know it)!

I just looked it up and Reduce white point was apparently introduced in iOS 7. Never used it, don’t think I have even seen it before and I thought I was quite up with iOS settings!
 

onepoint

macrumors 6502a
Aug 3, 2010
842
504
USA
PSA: Auto-brightness has been moved to Accessibility in the latest Beta. I’m not a fan. I find that auto-brightness tends to lag, and disabling/enabling quickly would get it back in shape. Now I’ll have to dive deeper in the Settings menu to do so, since there is no Force Touch option for it in Control Center.
 

Paddle1

macrumors 68040
May 1, 2013
3,589
1,427
PSA: Auto-brightness has been moved to Accessibility in the latest Beta. I’m not a fan. I find that auto-brightness tends to lag, and disabling/enabling quickly would get it back in shape. Now I’ll have to dive deeper in the Settings menu to do so, since there is no Force Touch option for it in Control Center.
Not sure it's very intuitive to not have auto-brightness in Display & Brightness.
 

RecentlyConverted

macrumors 6502a
Original poster
Oct 21, 2015
832
593
PSA: Auto-brightness has been moved to Accessibility in the latest Beta. I’m not a fan. I find that auto-brightness tends to lag, and disabling/enabling quickly would get it back in shape. Now I’ll have to dive deeper in the Settings menu to do so, since there is no Force Touch option for it in Control Center.

I have Launcher on my iPhone and used that for quick access to various settings that I wanted to change frequently. Unfortunately in iOS11 Apple have removed this function. I hope it comes back or that the developer is able to find a work around ( again ).
 

jhall8

macrumors 6502
Jan 15, 2017
326
419
Milwaukee, Wisconsin

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az431

Suspended
Sep 13, 2008
2,131
6,122
Portland, OR
Disabling auto brightness and reduce white point did not fix the issue with dim screen on a 10.5 iPad. I even turned off true tone, and the screen is still quite bit dimmer than even an original iPad Air. Downgrading back to iOS 10 restored the full screen brightness.
 

Diemenz

macrumors member
Sep 9, 2015
82
44
i just installed 11.8 on my wife’s 6s plus and the screen starts bright then automatically dies down regardless of setting. I checked white point and auto brightness and both are turned off. It seems like it works at full brightness for about 4 to 5 minutes after a reboot then defaults back to a lower brightness even though the settings say full brightness. Jumped it back and the brighter screen was restored.
 

trifid

macrumors 68020
May 10, 2011
2,045
4,881
I was outside in full sun and couldn't see my iPhone screen with iOS11 even though it was at max brightness.

It's a very significant reduction in brightness by default even thought it can be changed in accessibility, I was already experiencing poorer battery performance at the capped brightness, it seems it'd be horrible battery performance we if tweak the white point setting.

See comparison below of iPhone SE iOS 11 vs 10, all at max brightness:

CgZRqdg.jpg

IZRwMob.jpg

RJkfBpE.jpg
 

onepoint

macrumors 6502a
Aug 3, 2010
842
504
USA
I was outside in full sun and couldn't see my iPhone screen with iOS11 even though it was at max brightness.

It's a very significant reduction in brightness by default even thought it can be changed in accessibility, I was already experiencing poorer battery performance at the capped brightness, it seems it'd be horrible battery performance we if tweak the white point setting.

See comparison below of iPhone SE iOS 11 vs 10, all at max brightness:

CgZRqdg.jpg

IZRwMob.jpg

RJkfBpE.jpg
That ain’t right.
 
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barnesy99

macrumors member
Apr 29, 2011
60
193
London, UK
Have noticed this too. My 6S screen is considerably dimmer at full brightness. It was hard enough to see the screen when outside before, now it is basically impossible.....

Turning off the 'Reduce White Point' solved the issue though :)
 

TonyC28

macrumors 68020
Aug 15, 2009
2,261
6,113
USA
Same issue here. I have auto brightness and reduce white point off. I was outside in bright sun using my phone and I slid the brightness in control center all the way up. While using my phone the screen suddenly got dimmer. I could barely see it in the sun. The slider in control center and in brightness settings would only go half way up. I could dim it all the way down but when I slid up it would stop getting brighter at half way, but the slider would go all the way up.
 

onepoint

macrumors 6502a
Aug 3, 2010
842
504
USA
Same issue here. I have auto brightness and reduce white point off. I was outside in bright sun using my phone and I slid the brightness in control center all the way up. While using my phone the screen suddenly got dimmer. I could barely see it in the sun. The slider in control center and in brightness settings would only go half way up. I could dim it all the way down but when I slid up it would stop getting brighter at half way, but the slider would go all the way up.
Was your phone hot from external temp/sun exposure? I know occasionally when I get in my car, that’s been sitting in the sun and very hot, my phone display will dim until the A/C cools things down.
 

TonyC28

macrumors 68020
Aug 15, 2009
2,261
6,113
USA
Was your phone hot from external temp/sun exposure? I know occasionally when I get in my car, that’s been sitting in the sun and very hot, my phone display will dim until the A/C cools things down.
Hmm that might be it.
 
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