Feeling Headache using Mi 9T - Redmi K20 / Xiaomi Mi 9T Questions & Answers

I start experiencing seware headache after using Mi 9T for about 15 mins.
Anybody else experiencing the same ?
Has it something to do with PWM and DC dining ?
I had a Nexus 6P before and never experienced head pain. I wonder if Nexus 6P had DC diming.

drink more water and get some oxygen
no such problems and I call a lot every day

yaro666 said:
drink more water and get some oxygen
no such problems and I call a lot every day
Click to expand...
Click to collapse
Thanks for the advice ?
I don't do much calling.
I get headache looking at the screen.

Well, what phone did you have before the Mi 9t? was it an LCD display? some people seem to be sensitive to PWM, you might want to look in the future for a phone with DC Dimming.

lethallunatic said:
Well, what phone did you have before the Mi 9t? was it an LCD display? some people seem to be sensitive to PWM, you might want to look in the future for a phone with DC Dimming.
Click to expand...
Click to collapse
I had Nexus 6P before Mi 9T.
I will see for few more days if situation gets any better. It might be something else causing the pain.

mohsin.android said:
I had Nexus 6P before Mi 9T.
I will see for few more days if situation gets any better. It might be something else causing the pain.
Click to expand...
Click to collapse
Download some PWM protection apps from play store
Those apps will lock the screen at maximum brightness and apply a filter to the screen to prevent PWM.

mohsin.android said:
I had Nexus 6P before Mi 9T.
I will see for few more days if situation gets any better. It might be something else causing the pain.
Click to expand...
Click to collapse
Lower the brigtness and turn reading mode on.
Also, do you use glasses?

Doesn't seems like device issue or something, definitely ur eye sight getting weak or something. The issue u mention is eye sight issue, get ur eye check man. Cause I know people who has eye sight weak and they had same issue like u and turns out they had eye sight weak . Get checked up ur eyes sight.

BrianWuTwKh said:
Download some PWM protection apps from play store
Those apps will lock the screen at maximum brightness and apply a filter to the screen to prevent PWM.
Click to expand...
Click to collapse
I will give them a try. Thanks

Pupet_Master said:
Lower the brigtness and turn reading mode on.
Also, do you use glasses?
Click to expand...
Click to collapse
Yes I am using reading mode now.
And yes I wear glasses

farhan20 said:
Doesn't seems like device issue or something, definitely ur eye sight getting weak or something. The issue u mention is eye sight issue, get ur eye check man. Cause I know people who has eye sight weak and they had same issue like u and turns out they had eye sight weak . Get checked up ur eyes sight.
Click to expand...
Click to collapse
Yeah I have weak eye sight.
But thanks anyway.

Thanks everyone for the input.
I think the problem is specific to me and not related to the device in general.
I will take precautionary measures to protect my eye sight.

mohsin.android said:
Yes I am using reading mode now.
And yes I wear glasses
Click to expand...
Click to collapse
My girlfriend who also wear glasses had the same problem.
She actually had to check her sight again as her glasses wasn't doing the job anymore

I'm also getting headaches after using Mi9T coming from oneplus, because of bigger display. I keep it at a safe distance when watching videos.

Same problems with my redmi k20 pro
Same problems with my redmi k20 pro ..and some headaches after calling..

imankk said:
Same problems with my redmi k20 pro ..and some headaches after calling..
Click to expand...
Click to collapse
What? After a phone call, how does that makes sense?

Related

Screen flickering in direct sunlight?

Hello,
I picked up my GS4 about a week ago but haven't really used it in direct sunlight until today. I was outside, and the sun was shining brightly on the screen. Home screen was fine, and darker images were ok, but if I were to go to an app with a primarily white background, or open up something which used the keyboard (texting) the screen would flicker pretty noticeably. Brightness is all the way up, and auto tone was off.
Has anyone else seen this?
yup this is normal esp when using the keyboard.
Im not sure if it will be fixed.
orlandoxpolice said:
Hello,
I picked up my GS4 about a week ago but haven't really used it in direct sunlight until today. I was outside, and the sun was shining brightly on the screen. Home screen was fine, and darker images were ok, but if I were to go to an app with a primarily white background, or open up something which used the keyboard (texting) the screen would flicker pretty noticeably. Brightness is all the way up, and auto tone was off.
Has anyone else seen this?
Click to expand...
Click to collapse
richard371 said:
Im not sure if it will be fixed.
Click to expand...
Click to collapse
I guess my question is, is this a hardware issue with many GS4's or a minority. I came across a thread on the Tmobile GS4 forum where people were experiencing it, but it seems not everyone is.
orlandoxpolice said:
I guess my question is, is this a hardware issue with many GS4's or a minority. I came across a thread on the Tmobile GS4 forum where people were experiencing it, but it seems not everyone is.
Click to expand...
Click to collapse
I actually noticed for the first time today too..
Sent from my WICKED AT&T S4 i337
Its a hardware thing, but also its only in touchwiz so a developer might be able to turn it off so to speak.
It adjusts the color and tone no matter what to save the display from overheating and or burning in...
Does it a lot and I notice it cause im weird about those kinds of things.
If you use CM 10.1 or AOKP its gone.
ive made some progress with the RGB light meter on this; hoping a friend can write up some code so we can test out a 'smoothed out' transition and sampling rate and one that is sped up, averaged faster, but will take up more CPU and RAM and battery but more accurate.
here is another thread regarding it:
http://forum.xda-developers.com/showthread.php?t=2280715
http://forum.xda-developers.com/showthread.php?t=2284726
Maybe if someone who is using CM10 or AOKP could test it to see if it is a software issues and not a hardware issue?
edit: slade and jet replied while I was writing this...thanks for the info. looks like it is touchwiz related.
edit2: just went out in the sun again to test a lot of different options in the display settings (which none worked) but is seems it is only happening when the keyboard is enabled. I am using swiftkey.
yeah TW and that sensor communicate; i believe the sensor itself probably works better ALONE, but TW changes it and throttles it for either battery or screen safety.
It is always dependent on what is being pulled up on the screen, though it can be mitigated quite a bit if you disable all power saving and screen auto features, and leave brightness under 80% or so.
yea anything under 80% in direct sun is basically black. all power saving and screen auto modes were disabled. i covered up all of the sensors too and it still flickered....
orlandoxpolice said:
yea anything under 80% in direct sun is basically black. all power saving and screen auto modes were disabled. i covered up all of the sensors too and it still flickered....
Click to expand...
Click to collapse
Not just a sensor thing per-say.
It's hard to explain, they most likely did it because they didn't want the amoled to burn in.
Its the same reason why the brightness goes up another 34% or so on auto above the max brightness. Only uses it when needed to save the screen and battery.
Does it on youtube too btw, bring up a video on wide screen then tap it and you'll see the drastic color shift
I noticed this thing when I got my phone also. I thought I was just imagining it but I guess it's an actual problem
geoldr said:
I noticed this thing when I got my phone also. I thought I was just imagining it but I guess it's an actual problem
Click to expand...
Click to collapse
'its not a problem, its a feature'
-Steve Jobs
Seriously its about power handling/battery saving and white balance, but its noticeable, and annoying.
Slade8525 said:
'its not a problem, its a feature'
-Steve Jobs
Seriously its about power handling/battery saving and white balance, but its noticeable, and annoying.
Click to expand...
Click to collapse
Yep, looking into a whole bunch of stuff, just installed ubuntu so maybe I can compile something; gonna look deep into the framework.
Please read forum rules before posting
Questions and help issues go in Q&A and Help sections
Thread moved
Thank you for your cooperation
Friendly Neighborhood Moderator
jetlitheone said:
Yep, looking into a whole bunch of stuff, just installed ubuntu so maybe I can compile something; gonna look deep into the framework.
Click to expand...
Click to collapse
Thanks, let me know if you figure anything out.
Open camera in direct sun and it flickers too..
Sent from my SGH-M919 using xda app-developers app
This is so annoying. Does anyone on touch wiz not experience this?
Sent from my SAMSUNG-SGH-I337 using xda premium
orlandoxpolice said:
This is so annoying. Does anyone on touch wiz not experience this?
Sent from my SAMSUNG-SGH-I337 using xda premium
Click to expand...
Click to collapse
No that's not possible, its hard coded into touchwiz, this isn't a bug or anything...
If people say they don't have it; they're not noticing it.
jetlitheone said:
No that's not possible, its hard coded into touchwiz, this isn't a bug or anything...
If people say they don't have it; they're not noticing it.
Click to expand...
Click to collapse
Gotcha
Sent from my SAMSUNG-SGH-I337 using xda premium
Thought my eyes were going crazy. Mine does this too. It even did it once under some fluorescent lights. It's not annoying enough to matter but it would be cool if it gets fixed.

note 3 screen auto dimming

adaptive display off
reading mode off
brightness manual
smart screen off
brightness level set to 90% or so
and my screen auto dimm for no reason playing PVZ or any other game is very annoying to the point of stop playing
I did some reading on att note 3 forums and they said this is implemented on the Kernel itself so if we can get full unlock perhaps we can use a custom kerlel to fix this BIG PROBLEM
Speedy Gonzalez said:
adaptive display off
reading mode off
brightness manual
smart screen off
brightness level set to 90% or so
and my screen auto dimm for no reason playing PVZ or any other game is very annoying to the point of stop playing
I did some reading on att note 3 forums and they said this is implemented on the Kernel itself so if we can get full unlock perhaps we can use a custom kerlel to fix this BIG PROBLEM
Click to expand...
Click to collapse
Pardon my ignorance...but could you clarify what you mean?
I'm not even rooted yet and I found options to adjust everything you have mentioned there.
christianpeso said:
And what is the point of making another thread about this when there are already bootloader threads around?
Click to expand...
Click to collapse
nothing I am just surprised why there is no thread about this screen dimming issue and wanted to bring it up
PaulusGrandis said:
Pardon my ignorance...but could you clarify what you mean?
I'm not even rooted yet and I found options to adjust everything you have mentioned there.
Click to expand...
Click to collapse
sorry if I was not clear with all those options turned off the screen keeps auto dimming during games so there is nothing you can do to keep the screen at same brightness what is unacceptable
Speedy Gonzalez said:
sorry if I was not clear with all those options turned off the screen keeps auto dimming during games so there is nothing you can do to keep the screen at same brightness what is unacceptable
Click to expand...
Click to collapse
Ahh, gotcha.
I've never experienced any problems with the screen dimming when I'm using it (even playing games). But I like to use Smart Stay (works great for me) and I like my brightness at 100% all the time, so it's a little different scenario, I guess.
PaulusGrandis said:
Ahh, gotcha.
I've never experienced any problems with the screen dimming when I'm using it (even playing games). But I like to use Smart Stay (works great for me) and I like my brightness at 100% all the time, so it's a little different scenario, I guess.
Click to expand...
Click to collapse
maybe you didn't noticed yet because all not 3's have the same issue
http://forum.xda-developers.com/showthread.php?t=2474067
http://forum.xda-developers.com/showthread.php?t=2470435
http://forum.xda-developers.com/showthread.php?t=2471402
I can't believe no one experienced this just try PvZ 2 the phone overheats and screen brightness start fluctuating
Speedy Gonzalez said:
I can't believe no one experienced this just try PvZ 2 the phone overheats and screen brightness start fluctuating
Click to expand...
Click to collapse
I've actually noticed this as well while on Chrome. I don't always see it but it dims and goes back to normal. It's a bit annoying yes since my note 2 never had this problem.
Help xciald
ainjobizz said:
I've actually noticed this as well while on Chrome. I don't always see it but it dims and goes back to normal. It's a bit annoying yes since my note 2 never had this problem.
Click to expand...
Click to collapse
ME TOO
I've had this since the S4. Never found a solution. Really annoying.
Sent from my SM-N900T using xda app-developers app
is really annoying when playing games like pvz or something where you focus your vision like web browsers
Speedy Gonzalez said:
is really annoying when playing games like pvz or something where you focus your vision like web browsers
Click to expand...
Click to collapse
I've seen it and been looking for where to turn it off. Was going to post about it, so glad you did. It's very annoying and send to happen at odd times in pretty much any app.
Now here's another one for you. Have you noticed when you pick up your phone that it will vibrate twice? I can't tell what I'd doing it, so it may be a system thing.
armus said:
I've seen it and been looking for where to turn it off. Was going to post about it, so glad you did. It's very annoying and send to happen at odd times in pretty much any app.
Now here's another one for you. Have you noticed when you pick up your phone that it will vibrate twice? I can't tell what I'd doing it, so it may be a system thing.
Click to expand...
Click to collapse
I hope we can do something about it with safestrap but since is on the kernel itself is going to be imposible I guess , haven't noticed the ring problem but didn't pay attention
Speedy Gonzalez said:
is really annoying when playing games like pvz or something where you focus your vision like web browsers
Click to expand...
Click to collapse
Yea if in the next update it don't get a fix Samsung will not like me very much
Like how LG probably hates me every chance I get I talk **** especially about their LowGrade ****uition
Android product ...LG is byfar the worst android creators out there and should just stick
To making ****ty appliance or better yet just stay out of the electronic world all 2gthr IMO...
But back to the subject at hand it seems its when a lot of processes are going that it dims (CRASHES)
Try keeping an auto task killer app running to kill unwanted tasks as they pop up...
It works but not for too long. it would seem the 2G of RAM is not enough for the quadcore
maybe 3G would have worked better.
Solution
Kinda late with an answer but I figured out why my note 4 was doing that out of the bloom. Turns out I had an option checked for my screen brightness to adjust based on the image that was on my display. Just go to Settings, Display, then uncheck the Auto Adjust Screen Tone. That should fix it. ☺

Mi A2 Issues need to be fixed

The MI A2 is actually a great device with a great performance But !!! also a lot of problems without fixing makes the device a little poor :
Issue Number 1. Proximity sensor
Not working very well and take a long time to get the screen black after answers the calls and whatsapp voice massages
Issue Number 2. Unstable writing and reading speed (emmc) cause a lot of lags and freezing and we don't even know if it's a software problem!!!
Issue Number 3. Wifi disconnected
it's clear to say that the mi a2 have a poor wifi adapter because sometimes its randomly disconnect the wifi , and never find the signal until i go to near the router to catch the signal again
and we don't know either if its a software problem or a hardware
and there's a lot of small ones like
camera2api , smart Lock freezing , .......
I am not asking Xiaomi to be perfect , but we need a clarification about the problems
We receive 2-3 updates in a month and no one care about any of the problems
Who agrees!!!????
Wi fi needs a device restart after some hours of use for working properly. About emmc etc I didn't notice something.
I have no issues with WiFi and I'm all day on wifi doing heavy usage.
About storage I have noticed sometimes the phone's slowdown.
I have the 64/4/fpc version.
Sent from my Xiaomi Mi A2 using XDA Labs
I Just have the First issue, never had lags/freezing, or problems with wi-fi. 6/128 version.
AcostaJA said:
I have no issues with WiFi and I'm all day on wifi doing heavy usage.
About storage I have noticed sometimes the phone's slowdown.
I have the 64/4/fpc version.
Sent from my Xiaomi Mi A2 using XDA Labs
Click to expand...
Click to collapse
When i get a little far from router the signal drop suddenly and when wifi name shows again its never connect until i go near router again
i had a honor 7x, Nexus 6 , Xperia Z , before the mi a2 never had this problem
natanfranghieru said:
I Just have the First issue, never had lags/freezing, or problems with wi-fi. 6/128 version.
Click to expand...
Click to collapse
yes for some reason the 6/128 version don't have a
rom issues , and wifi just try using wifi a little far for a little you will notice the issue
Gues I'm lucky since I haven't had any of those software/hardware issues. I've been extremely happy with my MI A2. Even my friends turn green with envy whit their expensive flagship models.
My A2 is Global 64/4 variant.
Maybe if I'm stretching a bit the audio output via headphones could be louder and ldac-codec would be nice to have since theres no 3,5mm port.
This part is bit offtopic and there's nothing Xiaomi can do to fix it. I've been spoiled with great xda-communities since the beginning of my android days back in 2010. And I have to say that forum is starting to remind me a bit of those awful miui-forums with thousands of "please fix dear bro fix fix"-messages, stupid clickbait topics and questions wich are already answered in the OP or in previous post. I know I'm not much of a help either and the best guy to whine about that, but it's very frustrating when all the useful stuff gets buried under that ****. I'm still grateful for what we have and big respect to everyone who are willing to help and spent their time for the good of our device and community.
I have got a problem yesterday. The blink light of notification doesn't work on Messenger and some others OTT apps ! I didn't change my setting !
verttl said:
Gues I'm lucky since I haven't had any of those software/hardware issues. I've been extremely happy with my MI A2. Even my friends turn green with envy whit their expensive flagship models.
My A2 is Global 64/4 variant.
Maybe if I'm stretching a bit the audio output via headphones could be louder and ldac-codec would be nice to have since theres no 3,5mm port.
This part is bit offtopic and there's nothing Xiaomi can do to fix it. I've been spoiled with great xda-communities since the beginning of my android days back in 2010. And I have to say that forum is starting to remind me a bit of those awful miui-forums with thousands of "please fix dear bro fix fix"-messages, stupid clickbait topics and questions wich are already answered in the OP or in previous post. I know I'm not much of a help either and the best guy to whine about that, but it's very frustrating when all the useful stuff gets buried under that ****. I'm still grateful for what we have and big respect to everyone who are willing to help and spent their time for the good of our device and community.
Click to expand...
Click to collapse
If we don't know that the mi a2 is a fabulous phone we wouldn't bought it in the first place , it's an amazing phone with a lot of features , everyone open the xda forum to look for roms , solutions , news , root , twrp .
im convinced 100% with the mi a2 , but i don't want my phone to drop wifi Suddenly in the middle of my work , don't want a half of year until my phone clear cache of Google chrome , and don't want to wait a 3-5 seconds
until the proximity sensor works after answering!!!! I just want to make sure that developers knows the problems , and maybe it will be the perfect device!!!
Hassan.ajs said:
When i get a little far from router the signal drop suddenly and when wifi name shows again its never connect until i go near router again
i had a honor 7x, Nexus 6 , Xperia Z , before the mi a2 never had this problem
Click to expand...
Click to collapse
Seems your problem is not your phone, likely you live in a área crowded by WiFi routers fighting fit a free channel, same as you described happened to me with an Samsung note 2, S4, etc at an corner in my home, the only solution was to manually setup a fixed channel where at this corner my router faced fewer competition for bandwidth.
Try different phones likely you'll see the same behavior (my A2 has even better WiFi performance at this corner in my home.)
Sent from my Xiaomi Mi A2 using XDA Labs
Hassan.ajs said:
If we don't know that the mi a2 is a fabulous phone we wouldn't bought it in the first place , it's an amazing phone with a lot of features , everyone open the xda forum to look for roms , solutions , news , root , twrp .
im convinced 100% with the mi a2 , but i don't want my phone to drop wifi Suddenly in the middle of my work , don't want a half of year until my phone clear cache of Google chrome , and don't want to wait a 3-5 seconds
until the proximity sensor works after answering!!!! I just want to make sure that developers knows the problems , and maybe it will be the perfect device!!!
Click to expand...
Click to collapse
Did you try to calibrate the proximity sensor?
Type *#*#64663#*#* in dialer
13.Proximity sensor
Calibrate
verttl said:
Gues I'm lucky since I haven't had any of those software/hardware issues. I've been extremely happy with my MI A2. Even my friends turn green with envy whit their expensive flagship models.
My A2 is Global 64/4 variant.
Maybe if I'm stretching a bit the audio output via headphones could be louder and ldac-codec would be nice to have since theres no 3,5mm port.
This part is bit offtopic and there's nothing Xiaomi can do to fix it. I've been spoiled with great xda-communities since the beginning of my android days back in 2010. And I have to say that forum is starting to remind me a bit of those awful miui-forums with thousands of "please fix dear bro fix fix"-messages, stupid clickbait topics and questions wich are already answered in the OP or in previous post. I know I'm not much of a help either and the best guy to whine about that, but it's very frustrating when all the useful stuff gets buried under that ****. I'm still grateful for what we have and big respect to everyone who are willing to help and spent their time for the good of our device and community.
Click to expand...
Click to collapse
nemesis53 said:
Did you try to calibrate the proximity sensor?
Type *#*#64663#*#* in dialer
13.Proximity sensor
Calibrate
Click to expand...
Click to collapse
i tried to calibrate
proximity sensor works , but sometimes take a little time to respond ,for example it took a 2 seconds the screen to get black while answering calls
Hassan.ajs said:
i tried to calibrate
proximity sensor works , but sometimes take a little time to respond ,for example it took a 2 seconds the screen to get black while answering calls
Click to expand...
Click to collapse
Dou you use any screen protector which covers the sensor?
Some screen protectors affetcs the sensor.
i have the same problem with the wifi
Add speaker distortion while receiving a call to the issues list, this cropped up after Pie update.
Proximity sensor has been fixed after pie.
Proximity sensor has been fixed in Pie
I have updated my phone and from then there is no sound for notications and calls.I do not no how to fix.

Do custom roms have dc dimming?

Since the stock rom does not.
Next LineageOS 17.1 build will have it. Stay tuned.
I read somewhere that is a hardware related limitation of our device. Does not work in Amoled.
Sir_gpm said:
I read somewhere that is a hardware related limitation of our device. Does not work in Amoled.
Click to expand...
Click to collapse
This is not the case. Xiaomi is unwilling to add dc dimming to the redmi k20 (mi 9t). Xiaomi has added dc dimming to many amoled screen devices previously released.
I hope xiaomi or a custom rom will add dc dimming. I now use Oled saver app.
Ratataz said:
I hope xiaomi or a custom rom will add dc dimming. I now use Oled saver app.
Click to expand...
Click to collapse
I did try that app but it still flickers and gives me eye strain. Try record in slow motion with another phone and you can still see it.
I sold my device as I just can't wait any longer. I'm happy with my decision tho. Hope you guys get a solution soon too.
Sent from my Xiaomi Redmi Note 8 Pro using XDA Labs
djdelarosa25 said:
Next LineageOS 17.1 build will have it. Stay tuned.
Click to expand...
Click to collapse
Do you have a source of your statement? I can´t find anything useful...
Thanks in advance!
D0ping said:
Do you have a source of your statement? I can´t find anything useful...
Thanks in advance!
Click to expand...
Click to collapse
Unfortunately, Pig dropped it. It was causing fingerprint sensor issues.
Tronic71 said:
I did try that app but it still flickers and gives me eye strain. Try record in slow motion with another phone and you can still see it.
I sold my device as I just can't wait any longer. I'm happy with my decision tho. Hope you guys get a solution soon too.
Sent from my Xiaomi Redmi Note 8 Pro using XDA Labs
Click to expand...
Click to collapse
You could use PWMfree

Dark bleeding - 1 month old

Hello guys, I'm new on Mi 9t, I have it since one month now.
I'm running 11.0.5 global (waiting for miui 12) and everything is working smootly (a part some heating problems and battery drain).
Yesterday I noticed a BIG strange spot on the right side of the display only when I have a black/dark theme (for example on Telegram) and when brightness/light around the phone is low.
I tried to googled it but I didn't find anything useful and still don't understand if it's software or hardware. I just get that is a common issue of AMOLED screen but in 2020 I don't get how this is not fixable lol.
Any suggest?
Thanks in the advance and I wish you a happy day!
Nope, every AMOLED is like that. Tested even on the S10 plus. No worries
Marius_Kun said:
Nope, every AMOLED is like that. Tested even on the S10 plus. No worries
Click to expand...
Click to collapse
So there aren't any solutions? :/ It's just luck and time?
Gonna have to provide a picture (if it shows) to see what you are trying to describe bro.
h320 said:
So there aren't any solutions? :/ It's just luck and time?
Click to expand...
Click to collapse
Nope. It's just the way AMOLED is. Had this on every AMOLED device i tried

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