Database Users

S4 Backlight Flicker

Hi all,
I have a visual disorder known as PMA ( Persistent Migraine Aura). Simpy put, my vision is extremely sensitive to all light forms.
The S4 has really bad backlight flicker, especially in low conditions I can see the flicker. It's really horrible for me as I see it more than the average person would. I couldn't believe it had such prominent flickering from the backlight LED's (low refresh rate?) when I first got my phone; I recently sold my Laptop as it had a poor LED backlight panel.
Now to my question: is there any rom out there that reduces this? Any way of reducing this flicker (increase refresh rate)? It's really making me considering selling the phone
Any help will be appreciated.

Is this normal or problem? Brightness.

Good afternoon,
I do not know if it is something normal or it is a real problem that requires technical support. The case is that I have the mobile without automatic brightness, and when I set the brightness to very low levels, when unlocking the terminal, when you turn on the lock screen with the wallpapers, it appears as a slight flicker of the screen, thousandths of a second, almost imperceptible if you do not stare. Something like when you start to light a light bulb until you get to have light at all, but with a very slight flicker.
It is not an extreme flicker that completely turns off the screen or any of that, it may even be the operation of the brightness sensors (which happens to be strange because the automatic brightness is off), but I worry that it may have more problems in the future. Also I have noticed that having the brightness to the maximum of half of this problem does not occur, only with low brightness. There is also no blinking once unlocked using the phone itself, everything works perfectly. It is as if the lock screen was automatically adjusted when unlocked.
Should I contact technical support or just foolishness of mine?
Regards and thank you very much in advance.
PD: I have EMUI 4.0, NXT L29 with b192

Maybe you can upload a video so we know what ur talking about.

I think I've actually noticed something like what you're describing in my device. In summary, ever so slight flicker of brightness when display is on low/lowest level with automatic level off. I assumed it was normal

gm007 said:
Maybe you can upload a video so we know what ur talking about.
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I have tried to record videos, but it is very difficult to appreciate.

MuPp3t33r said:
I think I've actually noticed something like what you're describing in my device. In summary, ever so slight flicker of brightness when display is on low/lowest level with automatic level off. I assumed it was normal
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I also think it's normal. It's like an automatic contrast adjustment to accommodate the eye to the screen. I think it's a matter of the IPS NEO screen.

Does anyone else have this?

Screen flicker in low light conditions?

I keep my screen brightness very low and I have had it happen a few times in low light conditions where the screen will go into full seizure mode and start flickering. What I have done is then increase the ambient light around the phone and the flicker stops. I read of a few others on the Lenovo forums with the same issue but no official problem acknowledged yet. Anyone else here have this issue? I am not sure if I should send it back since it is a new device. I worry about future issues and longevity.

I got my phone yesterday and noticed after using it for few hours. It only happens at certain brightness level with Adaptive brightness On. I haven't noticed it after that. I use manual brightness mode and from what I read on lenovo forums that it doesn't happen with manual. I was thinking of replacing it too but after reading so many users complaining about it I am sure this has to do with software. Also, I noticed random WiFi disconnection.
I hope they push out update for all these bug fixes.
EDIT: My sister has the same phone since May and she noticed it too. So, I am pretty sure it is software related issue.

The issue is most probably due to PWM, since Moto G5 (and Plus) use it at low brightness: https://www.notebookcheck.com/Test-Lenovo-Moto-G5-Plus-Smartphone.213428.0.html (german, use Translate)
The display flickers at 2404 Hz (most likely due to pulse width modulation PWM) at a set brightness of 3% and below.
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It cannot be disabled (practically) by software means, it's the way the display driver controlls the brightness (because of cheap components). It's also present on 99% of AMOLED displays.
It causes eyestrain and headaches for a lot of people (I am one of them). The site above (also has an English version) checks for PWM on all reviews, so you can check other phones if you want to replace the G5.

ZE552KL screen flickering at lowest brightness level

I would take a video of this issue, but I don't have a good enough camera. It's really, really hard to capture unless you have good video recording tech, which I don't have. :crying:
My issue is that, when I set the brightness to its lowest level on my Zenfone 3, the screen starts flickering. This is especially noticeable with white backgrounds. You can tell that the screen is flickering (perhaps refreshing?) rapidly and it makes the phone painful to look at.
Someone actually created a thread about this issue here on XDA a few months ago, with a video showing this issue, but unfortunately, the video doesn't capture the flickering properly. Here: https://forum.xda-developers.com/zenfone-3/help/ze520kl-low-screen-light-level-20-t3603502
How to reproduce:
-Turn auto-brightness off
-Slide brightness bar all the way to the left (AKA to the lowest level)
-Open a white background/grayish background or blank page in Chrome
-Screen starts flickering
It happens across the phone, and intermittently. Sometimes it happens, sometimes it doesn't. In Chrome, in games, whatever. I once thought it could be related to charging the phone, but the screen has flickered on low brightness even when my phone wasn't plugged in, and at 70-80% battery. I might try resetting the phone to see if it's a software defect; I really hope it is.
Turning off hardware overlays in Developer Options does not resolve this issue.
I'm currently on ASUS stock Nougat, unrooted. I can't root right now. I don't have any screen overlays apart from CF.Lumen, which isn't set to come on during the day, when the flickering happens, and I don't use any screen color modes apart from the default settings. I also always have auto-brightness turned off.
Just wondering if anyone else is having this issue. I might try recording it one day.
Thanks.

Update 1: Removed my 64GB SD Card from the phone to see if that made a difference. It didn't. So the flickering isn't related to power management, AFAIK.
Next step is to wipe the phone completely, including its cache partition from stock recovery, and set the phone up as new again. It might be a hardware issue, but my fingers are crossed.

I've had this issue since I got the phone, ZE552KL. Turning off auto brightness fixes it for me, so I have a feeling it has more to do with ASUS' auto brightness algorithms than anything else.

sensi277 said:
I've had this issue since I got the phone, ZE552KL. Turning off auto brightness fixes it for me, so I have a feeling it has more to do with ASUS' auto brightness algorithms than anything else.
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I always have auto-brightness turned off. I think it might have to do with the ambient light sensor. I've tested it using SMMI and it works just fine. But I wish there was a way to disable it, since I don't need it. I'm kind of disappointed in this phone.
I'm going to try a full reset, and perhaps a custom ROM to see if it's a hardware or software issue.

Screen Flikering Issue with auto brightness sensor on Zenfone Max Pro M1 6gb

Has anyone noticed Display keeps flickering when auto brightness is on. Even if phone is kept at a fixed position & same amount of light is exposed to the sensor it still keeps flickering. I mean if I'm watching movie it automatically dems or increases the brightness. please confirm how many user experiencing this problem! as per i know it was not resolved from 301 to till 331 update. is it manufacturing defect particularly with specific variant ?

I wouldn't call it it a flicker. More like the auto-brightness feature is so badly programmed that it doesn't transition from dim to bright and vice versa in a smooth, gradual or dynamic manner, like in older and cheaper phones.
My eyes get a shock every few seconds, trying to adjust to the sudden jumps in screen brightness. It's a real pain.
And yes, the issue has persisted through all the OTA updates without any sign of improvement.
Instead of addressing this most basic and "glaring" issue, Asus seems to be intent on introducing bloatware and EIS for the phone and announce it like it's the second coming.
The latest update was supposed to bring with it, system optimization but I don't see any form of basic optimization, let alone calibration, with the screwy display.
I can only guess at Asus' sense of priorities. Or if they're actually blind and/or stupid.

May be it was true that autobrightness was programmed badly manner it was not transist smoothly from dim to bright. But afterall we are facing it at serious level and uptill now asus has not solved yet. I just want to confirm that How many user experiencing screen flicker issue after enabling auto brightness or it was particularly manufacturing defect with specific varient.

its an autobrightness calibration issue,software update will fix it in future,lets hope so

Hello everybody! I found a bug: brightness is flickering even when "auto brightness" ("adaptive brightness") is disabled. Brightness can encrease for few seconds and then decrease to previous level. I read in some reviews that max pro m1 has adaptive brightness which changes depending on content on the screen. I tried to change a lot of display settings, developer settings, i tried to adjust CABC (Content Adaptive Brightness Control) through Nova Launcher (but later I read that CABC controls only autobrightness), and even hard reset. I flashed custom ROMs but it didn't help. Only Lux Dash app helps avoid this bug. But it is not very comfort to use it and I think there must be desicion on firmware level. Did anybody has this problem and any solution? May be somebody has this issue and found custom ROM without flickering brightness?
Sorry for my English, it's not my first language. And thank you for answers!