Random Screen dimming (while brightness slider stays at 100%) after A12 update

2 posts were merged into an existing topic: :de: Displayhelligkeit macht was sie will

just installed the latest update to PF4. auto dimming not fixed.

śr., 23 sie 2023, 12:08 użytkownik Daniel Schärer via Fairphone Community Forum <forum@fairphone.com> napisał:

“The good news is that the fix is confirmed and will be included in the October update”, wrote Yasen_Tomov.

If I remember well, recently update fix ‘ghosts inputs’.


Too bad :disappointed:. It is such a hinderance in use

We estimate that the update will be released around the start of October. I understand this estimate may be a bit disappointing. After our software developers finish working on an update, it takes week of testing before it is actually released. By the time the solution was finalized, it was too late to include it in the September update.

niedz., 27 sie 2023, 11:44 użytkownik Marianne van Lierop via Fairphone Community Forum <forum@fairphone.com> napisał:

Thank you. Let’s hope it will be resolved :pray:

I personally prefer dark mode, but I would recommend light mode all the time on an LCD display. Dark mode won’t save battery and compared to e.g. an OLED screen, dark mode on an LCD with low max brightness is going to be a pain.

Based on experience with both kinds of display on phones :slight_smile:


I had not previously experienced this problem, but I was recently on holiday spending a lot of time outdoors and (happily !) often in hot sunshine. The problem hit me smack in the face as soon as I attempted to take a landscape photo. I subsequently found that, whatever app I was using, if I turned the phone to landscape, the screen would turn off. If I turned back to portrait, the screen came on again immediately. If I turned the screen gradually, I would see the screen dim before becoming completely black.

Auto-rotate is off, but continues to work in Open Camera that I use.

The screen being dark does not affect the functioning of the app. I was able to take landscape photos (albeit approximate from the composition / framing point of view :roll_eyes: ).

Since this problem only occurred in hot sunlight when the device had been heated by the sun (but not early in the morning for example), I think it might be associated with the proximity sensor problem as mentioned by Uppercase in post 300.

[Edit: deleted text left in case others encounter the same phenomenon.]

Were you not wearing sunglasses when the “issue occurred” polarized sunglasses block the screen when the phone is landscape mode happened to me a few weeks ago confused me at first until i took off the glasses to realise the screen wasn’t actually dimmed


Just checked, that indeed likely was my problem! I probably just wasn’t wearing sunglasses in the early morning.

And welcome to the forum by the way! :slightly_smiling_face:

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great news,

would you be able to link to the source code of this fix?

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When it comes to source code, everything we can share is available on the Fairphone Open Source pages. Anything else is off limits.


This should be fixed in Android 13. Does anyone still have this problem? I tried using the phone in direct sunlight today and I didn’t notice any drop in brightness. I mostly had this happen in the car while running navigation and charging, so I still need to test that, but otherwise I think it’s indeed fixed and we can mark it as solved in the list.

no sunlight here, would wait a few days more to call this solved…

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I was just outside and didn’t notice any drops in brightness. (It’s sunny here.)

Yeah, waiting a few days is reasonable.

I also just installed the update and I have yet to encounter this. I hope it stays fixed, but we can only know for sure after a while and in the sun. It always happened outside in the sun when the phone was also getting warmer. Maybe next summer this bug will reappear who knows? :sweat_smile:

At this point I became a cynic, but I hope I don’t need to wait almost a year for a bugfix next time. My next phone would be a Google Pixel, because it’s unreasonable for me to wait for almost a year for a bugfix for an important feature of a phone.


I found this to be easily reproducible without any sun involved:

  • disable automatic brightness
  • set maximum brightness manually
  • start a game like Mighty Doom or MTG Arena and wait about 2 minutes (the game would heat up the phone enough to show the dimming behaviour)

So I’d say no need to wait for the sun for testing the fix. :wink:


Android 13? It’s not officialy released for FP4.
We have to wait for the october updates for Android 12. They said it will be resolved in this update.

Rollout of A13 for the FP4 started yesterday, see Software update: FP4.TP1V.C.073.20230905 | Upgrade to Android 13

And there’ll also be one last A12 update that will include the screen dimming fix. That’s because for some carriers A13 might not get rolled out as quickly as for others.