iPhone 12 screen brightness issue

I can con confirm the same exact issue happens side by side with my retired iPhone 7.

it sorta down brightness under the sun in 3 distinct steps. Almost at the same time as the 12 does.

I have no idea why I never noticed this before

mine does it also. It’s happening bc the phone is to hot. So it protects itself by dimming. Soon as it cools off it will go back to normal. Alot of these cases r keeping the heat in and now w summer here . It should not b over heating like that. I think its a defect in the phone itself

Great point jprice also I noticed with the magsafe charger it seems to get a little hotter. Easy fix though, just hold phone out window while charging while driving in car and in the refrigerator with the door ajar so it doesn't build moisture while at home

Same issue as all of you are reporting. One of you said the phone typically does this when the temps are about 90 degrees... (Most recent experience with the dark screen and overheating was in temps about 93)... Well, My BIG concern is I'm traveling to Egypt in 9 days -- Temps will always be above 90, sometimes over 100 in Luxor. I take all my pics on my phone. I will be heartbroken if I am not able to take pictures on my once-in-a-lifetime trip. Will talk to Best Buy tomorrow, but Apple didn't offer any advice except re-starting it (I tried that, and it didn't make any difference)... Can anyone give me assurance that I can take pics in Egypt's heat??? Any advice on things that have worked to prevent the overheating (I've got it in airplane mode and all apps closed), and the screen from darkening/?

I’m in Arizona, and now that it’s summer , I usually get about 10 minutes of flying my drone before it starts gradually getting darker to the point I can’t fly….I would bring a backup camera….good luck

I did a “test” .. it is 97 degrees here in western Colorado — I walked outdoors for 1.76 miles, 40 minutes—phone got hot, screen darkened. I put an oral thermometer on it when I got home — it registered at 106 degrees…. Definitely overheating. Rrrrrrr….

This is correct, I was out yesterday in 95 degree heat, took my phone to a car show, iPhone 12 Pro Max didn’t perform as it should. My phone overheated, picture quality was so dim I ended up taking off my sunglasses to see the screen even more. I had a logo or symbol pop up saying my iPhone is overheating and needs to be cooled down. That’s just a poor build Quality imo. APPLE, MUST FIX ISSUE!!!

UPDATE: - spent 2 hrs with a Certified Apple Technician at Best Buy, who got online with Apple. They ran some diagnostics, and determined my phone has a KBB (KNOWN back board) problem. They are going to replace the display board and see if it resolves the issue. However, the Apple Tech said this is a known problem with iPhone 12's, and it might continue having the same problem.... if so they will replace the phone, but I might still have the same problem because it is a KNOWN problem with the iPhone 12's... Not necessarily good news, but at least it's info. Might be worth it to take your phone in and get it checked with Apple's diagnostics and see if you can get some help...

Screen dims on it's own and does not respond to disable of this feature I have spent HOURS on the phone with customer support of this issue and zero resolution and customer support has closed the case over and over.

I saved and bought this size phone for vision problems and it randomly keeps dimming while in use for ZERO apparent reason to me making it unusable. I returned to apple product from samsung for THIS phone and SO DISAPPOINTED to get an expensive piece of unusable technology. It does this inside my home under day conditions without direct sunlight but becomes worst using it outside the home as I RARELY do. Maybe once a week? For google maps. I spend 1-2 hours with phone max per day usually INSIDE air conditioned home. And I am NOT using it in warm/hot conditions although I am in Texas. Today was 69 degrees. I did feedback from the link

How is the phone being exposed to near human body temps (98.6) causing an issue?! Certainly they created a phone knowing many people carry the phone against their body - although as a sick old lady I carry in my purse and I am RARELY out where it is hot.

I’m hearing stories here of Hot phones and screen dimming while indoors in air-conditioned environments.

Now that is very odd. I have been able to reproduce this issue, but every time under direct sunlight or very hot conditions while in use, and always outdoors. I am wondering if certain phones are having much more severe reaction to even warm temperatures than others.

Thanks for your suggestion. I sent my issues and complaints to Apple today in the link you provided. As stated earlier, even tho Best Buy replaced the display after I complained and after the diagnostics showed a KBB (known) issue, she told me not to be surprised if the issues start again — she said, “That’s what the 12’s do…”.

I believe the iPhone 12 is the first to use the newer A14 processor. I wonder how Apple tested for heat dissipation. Prior phones also dim screen when hot - as I reported earlier with my iPhone 7. However I never had this level of problems with prior iPhones (7 and 8)

Yes, in air conditioned home but the AC has only been on about a week here in north central Texas. Unusually wet and cool spring. So I will say the absolute worst time for me was in the car in 70 degree temps when it went totally black... but the dimming is crazy frustrating indoors day and night - NEVER direct sun EVER

Mine used to be the best untill winter. Now the simmer is here, when i use outdoor, the phone warms up in 15 to 30 min and screen brightness reduces. After that i was never able to get the full brightness. Nite the auto brightness in display and brightness setting and the accessibility setting is off. Still no solution. I have to say the phone gets warm very fast