yashsingh1/xdaforums huggingface dataset:
[Nexus 9 Q&A, Help & Troubleshooting] justsignbythex:
From my experience, flickering occurs time to time when displaying white backgrounds (Chrome, Settings, etc.) and brightness level around 30-40% like you mentioned. I actually RMA'ed my 2nd N9 and received my 3rd one on Friday. Still the same issue. I'm sending this one back as well because it drives me crazy.
[Nexus 9 Q&A, Help & Troubleshooting] di11igaf:
Out of 3 nexus 9s, the ons I have now has screen flicker, other two didn't. Everything else is good. No lightbleed, solid back. Low brightness, white page, guaranteed screen flicker after a while. Unusable (to me)while it's happening. Bump brightness up will help for a short while, but it will then start to flicker again. Really, really annoying.
[Nexus 9 Q&A, Help & Troubleshooting] scottjal:
This is rather annoying, I've tried both auto and now manual brightness and eventually the flickering comes back.

I think this is the only real issue that has me concerned the hardware might be defective, wish we had an answer on that.
[Nexus 9 Q&A, Help & Troubleshooting] KaneOfMars:
I have the same thing with mine ... Only happens when set to lower brightness levels. I can put mine to sleep, then wake it back up and its fine for a few days before it starts again. Which is a bit annoying because any higher and its too bright for my eyes. Not sure if I should RMA, I don't have any of the other issues that others have posted about. Would hate to get a replacement and end up with other problems.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
I RMA my N9, again!

This is my 3rd slate, and the flickering problem still persists!! I can assure this new Nexus 9 is from another batch, because the screen is much better than the two I had before, and the buttons are also better!

I'm already in Android 5.0.1 LRX22C

The problem is still happening!

I read something about one nvidia technology called prism, could it be from the tegra prism technology implemented to control screen brightness?
[Nexus 9 Q&A, Help & Troubleshooting] marctronixx:
i encourage you to read post #26 in this thread.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
Hi,

I had already read that post.

I had a tablet before this, a Nexus 7 2013, for about one year, and I never noticed this kind of screen flicker before!

I always used a fixed brightness on my N7. Now on my N9 I sometimes notice this flicker in fixed brightness, whenever brightness is set to 20/30% or less.

This is my 3rd device, and the screen is much better than before, with no screen bleeding, so I'm gonna give it a chance and wait a little longer before thinking again in RMA!
[Nexus 9 Q&A, Help & Troubleshooting] di11igaf:
Informative post, but this is not an issue of just normal LCD issues that may be perceived by some and not other s depending on the persons eyes. It is a distinct flicker that is a direct result of low ram. Again, low ram situations are causing the majority of the issues with this device. Anyone who has screen flicker, I guarantee if you go to developer options, process stats, while screen is flickering its in the 'critical' or 'low' ram state. I think its a bug with the GPU driver(dynamically allocated memory I believe), and low ram situations are what cause this. After a fresh reboot, the issue will disappear for a while until memory fills up- and it will as there seems to be MAJOR memory leaks with this device. I do think 2 gigs are OK as long as memory leaks are fixed.

Maybe I'm wrong- but last few times this has happened, when I check during screen flicker, ram is low/critical. It never happens when ram is normal.
[Nexus 9 Q&A, Help & Troubleshooting] FrankBullitt:
I share your opinion. I also had reached the same conclusion after monitoring the ram but wasn't 100 sure about the relation until I saw your post and realized others have the same thought.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
If it was a ram management problem , shouldn't everyone experience screen flicker then?
[Nexus 9 Q&A, Help & Troubleshooting] WarRaven:
Sorry I don't have a N9, chose Shield after much wrestling.

How ever, both tablets while different do share some similar things.

L5, Nvidia an screen flickering, in my Shield, I turn Adaptive brightness off and its perfect an way brighter then what has been mentioned in reviews.

On my N4,N7(12)N7(13) an N5 this does not apply as there is no screen flicker..I thought my N7(12) would be it doesn't.

Just thought I'd pitch in to see if it helps you guys too, I may grab a N9 LTE down the road when available but until then I'm good, an just want to help community where I can.

Cheers

WR
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
Another day and the screen flicker on my 3rd N9 continues...

Just posted this issue on Nexus 9 Google Help Forum: https://productforums.google.com/forum/#!category-topic/nexus/nexus-9/bpvx2Bg8XOo

Post you too, so that google ear us, and gives us an answer, and hopefully a solution!
[Nexus 9 Q&A, Help & Troubleshooting] AngelTrix:
Exactly same issue, already post also on google product forum

Exactly same issue, already post also on google product forum.
[Nexus 9 Q&A, Help & Troubleshooting] Ishwara Sandesh C M:
Flickers at low brightness.. :(
[Nexus 9 Q&A, Help & Troubleshooting] marctronixx:
I have an end of November build lte model and I use auto brightness. I have not seen any flicker (or light bleed or wonky keys :) ) on this build.
[Nexus 9 Q&A, Help & Troubleshooting] WisdomWolf:
I've been paying special attention to the memory status when screen flicker crops up and I can confirm that I've come to the same conclusion. There is a direct correlation between critical memory status and the manifestation of the screen flicker issue. Hopefully this means that it can be fixed with a software or firmware update, the sooner the better.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
I really hope so! This is very annoying.

I did a factory reset and a fresh start and my Nexus 9 stoped having screen flicker for about one week, then it started again with the flicker! Could it really be a ram management issue?

Another question is, did you noticed if freeing ram immediately eliminated the screen flicker?
[Nexus 9 Q&A, Help & Troubleshooting] WisdomWolf:
Yes, I noticed that if I freed RAM and got it to work the point that it was no longer showing critical status, the flicker resolved itself. Irritating that it happens at all, but at least I can do something about it for now. I was tempted to replace my Nexus 9 with a Galaxy Tab S, considering how much praise their screens get, but then I got the keyboard folio for the Nexus 9 and I like it too much to consider switching to a tablet that doesn't have it at the moment.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
And my 4th Nexus 9 arrived a couple of days ago!

Still has the annoying screen flicker!

Don't know what to say or do!

I've been testing the "memory" theory, but from my experience flickering occurs even when memory level is normal, and even with the system only taking 380mb of ram! Flickering even happens only after a couple of minutes from a fresh restart!

Is this software?!
[Nexus 9 Q&A, Help & Troubleshooting] Metallice:
My second replacement tablet has this. Noticed right away. The first two did not and I had them for a couple weeks. The second replacement also has a completely different hue and brightness.

This makes me think the flickering is a hardware issue.
[Nexus 9 Q&A, Help & Troubleshooting] bjoern76:
Yes, I noticed screen flicker quite often

Bought a nexus 9 at a german electronics store (media markt)

on January 3d. After seeming OK for a few days I noticed

screen flickering on low brightness after a couple of days.

The issue persisted and was quite annoying. Since relying on build

qualtity still seems like gambling I returned the device for money.

A real pity since I liked a lot of things about the nexus 9 (size,

vanilla android, double tab to unlock screen) but I dont have

the money to take bets on quality.
[Nexus 9 Q&A, Help & Troubleshooting] .vermilion:
Got the screen flickering as well. But it only appears when the tablet has low or critical memory. Every time the screen is flickering I went to development options and looked at the process statistics. Memory is always low or critical when flickering. It seems that this is just a software/memory management problem than a hardware issue.

Sent from my Nexus 9
[Nexus 9 Q&A, Help & Troubleshooting] AllanJacques:
I'm getting a N9 on the 25th of January and is there any way to test for screen flickering?
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
Hi,

You can't always make the flicker appear!

But normally it happens in medium to low brightness settings and is mainly noticeable in white backgrounds like in web pages, hangouts, ebooks, etc. And it lasts for about 20-30 seconds.

It could also be linked to low to critical available memory, but I didn't find that to be that linear!
[Nexus 9 Q&A, Help & Troubleshooting] di11igaf:
Exchanged my last nexus 9 for a new one. Screen flicker was the biggest problem on my last nexus 9, along with some type of speaker hang, or lag is the best way I can describe it. My new tablet does not do either of these, with the same type and amount of use. This worries me a little for those of you with flicker past your return window.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
Can you please confirm the initial part of your nexus 9 serial number?

Mine is HT4A, so it was manufactured in October, and yours?

Thanks
[Nexus 9 Q&A, Help & Troubleshooting] di11igaf:
Ht4b, white 32 GB. It does have light bleed worse than my last one, which had screen flicker and speaker issues daily. This new one has not had 1 instance of screen flicker or speaker issues.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
All my 4 Nexus 9 had screen flicker!

Could this be a thing only happening to the 16gb models?!
[Nexus 9 Q&A, Help & Troubleshooting] di11igaf:
No, because my last one which had it very bad was a 32gb.
[Nexus 9 Q&A, Help & Troubleshooting] ewa12321:
Maybe it's from auto screen brightness?
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
The screen flicker happens regardless the brightness is set to automatic or fixed.
[Nexus 9 Q&A, Help & Troubleshooting] simmac:
Both my HT4A Models had screen flicker, the HT4C which arrived yesterday yet hasn't had this issue.
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
All my 4 Nexus 9 were HT4A and all of them had the screen flicker.

That's really good news to know the HT4C doesn't have that issue!

Where did you buy your tablet?
[Nexus 9 Q&A, Help & Troubleshooting] simmac:
Google Play (Austria).
[Nexus 9 Q&A, Help & Troubleshooting] BFSilva:
I bought my tablets from Google Play (Portugal) also.

But I ended up returning it for a full refund.

I might give it some time now, and try to get another one later!
[Nexus 9 Q&A, Help & Troubleshooting] FD_:
I think I just experienced that flickering on mine as well. Could not believe it at first.:mad::( Mine is an October build, although I just received it from Google. Can anyone confirm this does not happen on newer builds? Is there anyone with a November or December unit that has this problem?
[Nexus 9 Q&A, Help & Troubleshooting] velocity90:
I had this twice, I use brightness 0 always because it's bright enough. Turning off the tablet and on again and it was gone. (screen off, no reboot)

Verstuurd vanaf mijn XT1039 met Tapatalk
[Nexus 9 Q&A, Help & Troubleshooting] FD_:
Could you post the first 5 letters of your device's serial number?:) Does it possibly start with HT4A?
[Nexus 9 Q&A, Help & Troubleshooting] velocity90:
Ht4c

Verstuurd vanaf mijn XT1039 met Tapatalk
[Nexus 9 Q&A, Help & Troubleshooting] liquidsuspension:
Screen flicker on mine too. :mad: Just like my Nexus 7 2012. It seems to always happen at lower brightness settings. HT4B
[Nexus 9 Q&A, Help & Troubleshooting] FD_:
Sorry for answering to a post that is this old!

I recently RMAd my Nexus 9 because of the screen flicker. The new device's screen has a different hue, just as you noticed with your device. I am now hoping that this is due to a different screen being built into this unit, and maybe a screen's hue can be linked to a certain batch of screens, so you could recognize a screen's probability of starting to flicker based on its hue. Do you still remember what hue your two devices had? What hue did the device have that did not suffer from flickering?
[Nexus 9 Q&A, Help & Troubleshooting] Metallice:
Greener tinted displays never flickerered. The warmer (in comparison) displays flickered, but the frequency varied device to device. However, the warmer displays also had significantly less backlight bleed and seemed more color/whites accurate overall though. Greener display seemed a bit sharper though (may just be the hue difference making it seem sharper to my eyes)

(I've see a lot a Nexus 9s and I'm convinced there are two different display sources.)

I currently have one of the warmer displays on a sand model. I've had it over a month and I've only had it flicker once in that whole time. Haven't seen it flick in a least a month of use since. Definitely a hardware issue from my experiences.
[Nexus 9 Q&A, Help & Troubleshooting] HypoTurtle:
Has anyone checked whether Forcing GPU rendering in Developer Options solves the flicker issue?
[Nexus 9 Q&A, Help & Troubleshooting] FD_:
My new unit (October build although just RMA'd :mad:) has warmer colors than my first one. The first one had more blueish colors.

Nevertheless, I already had the first flicker on the new device :mad:. I just hope it won't occur as frequently as with the first one and there will finally be a fix (update?) :fingers-crossed::D

I'll try and see if that helps. I read it did help for some Sony tablet, though I'm not sure it was the same kind of flickering there.
[Nexus 9 Q&A, Help & Troubleshooting] Valynor:
I'm pretty sure the screen flicker is finally gone in 5.0.2.

Didn't happen since the update, before it was flickering about every other time I switched it on. Yay. :good:
[Nexus 9 Q&A, Help & Troubleshooting] ChoklitCow:
Nah. I actually just googled screen flicker (and found this post) after updating because I noticed it for the first time tonight in a dark room. Slightly adjusted my slider and it stopped.
[Nexus 9 Q&A, Help & Troubleshooting] FD_:
It already happened several times in mine after the update so I'm sure it's still there :(
[Nexus 9 Q&A, Help & Troubleshooting] Valynor:
Sorry to hear that.

Still not a flicker on my N9 since the update. And it was flickering a lot before, about every 2nd or 3rd time I switched it on.
[Nexus 9 Q&A, Help & Troubleshooting] FD_:
I wonder if anyone who had experienced screen flickering before is already upgraded to 5.1.1. Any chance for an improvement regarding flickering? :fingers-crossed:
[Nexus 9 Q&A, Help & Troubleshooting] perksy42:
flicker on first nexus 9, light blue on second..

My first nexus 9 was a black 16gb WiFi, serial number HT4B, that had a very noticeable screen flicker at about 30% brightness. I returned it to Currys after 2 days and got a white HT4A as replacement (last in store) so far no screen flicker at all, the display does seem warmer too? I agree with others that there do seem to be different displays in use. Unfortunately there is some light bleed but its not a deal breaker, I couldn't deal with the screen flicker it was like having a strobe light on!
[Nexus 9 Q&A, Help & Troubleshooting] Soundchasr:
I've had flicker since I bought it in November. HTC told me software updates would fix it. Despite the recent update, it still flickers. I called HTC and they won't replace the unit. They tell me I have to send it in for repair and that I have to pay the shipping. What the heck is that??!?!?
[Nexus 9 Q&A, Help & Troubleshooting] ikenvape:
Just got mine today and noticed it right away. I dont know if this is still a thing but..Disabled HW overlays and done.
[Nexus 9 Q&A, Help & Troubleshooting] Tek20:
2015 Model

I just got a new Nexus 9 with a build date of October 2015. Running 6.0 Android and still have the screen flicker. I doubt this could be a hardware issue this late in the life of the tablet. Anybody ever solve this problem?
[Nexus 9 Q&A, Help & Troubleshooting] sheenswizner:
Its hardware issue by HTC!!

Try hard reset!
[Nexus 9 Q&A, Help & Troubleshooting] Tek20:
Based on my research they all do it.
[Nexus 9 Q&A, Help & Troubleshooting] ewa12321:
Dezember 2014 no screen flicker

Wysłane z mojego GT-I9295 przy użyciu Tapatalka
[Nexus 9 Q&A, Help & Troubleshooting] sheenswizner:
I have noticed screen flickering on stock latest marshmallow. So I have done little research on it and I am sharing solution.

Got to settings > display > adaptive brightness (on)

This issue fixed my screen flickering.

or

Increasing frequency by 2.5ghz might fixed via custom kernel (root needed).
[Nexus 9 Q&A, Help & Troubleshooting] monsieur_beau19:
Yeah, I noticed it the other day. I did a reboot and it hasn't flickered since then.
[Sony Xperia L] PeterLda:
Hi, before everything, i'm sorry for my terrible english, I speak Spanish, if you can't understand something, please tell me.

My Xperia L bricked after I installed a Xposed Module, I had intalled many others before and it worked perfectly.

I wanted to install "MaxUnlock", before that, I had installed "MinMinLock" and then "MaxUnlock", I don't know if it does make the phone brick or if I wasn't suposed to install both.

Here's a list of root apps that the phone have installed:

-ROM Toolbox: Just changed bootanimation, a lot of times, but since yesterday I had the same and nothing happened.

-Xposed Installer with:

-Gravity Box: Changed Clock to the center of the notification bar, changed JB icons for KK icons on the notification bar & putted Facebook and Whatsapp to the app ring (holding the home button on the navbar.).

-Unicon: Changed UI Icons for other pack.

-Xperia Flip.

-APM: Added Reboot button.

-A module to see the Wifi password, don't remember the name.

-MinMinLock & MaxLock (both installed after brick, I think this is what bricked the phone, Wasn't I suposed to have both?)

-ScreenOffAnimation.

I Repeat, everything was ok after I installed MaxLock, but I listed all of the root things that I installed just to know if any of these could make a incompatibility or something. (I know, my english is terrible, sorry, if you can't understand something please ask me, I speak Spanish.)

Thanks Everyone! I hope it have a solution.
[Sony Xperia L] EternalXDA:
hi. did you tried to flash your rom once again? mabe by all the system tweaking that you had, you just got your rom broken..

and your english is very good man, don't think bad about it at all. it's better than mine, at least :) ;)
[Sony Xperia L] PeterLda:
Ok... So, how can I do that?

Because I don't have a backup of my ROM, and I don't know if I am doing something bad but Pc Companion doesn't recognize my phone and when I plug the phone on my PC it says that an unknown device has been connected

Oh, and for bricked I mean that the phone just keep on the bootanimation

Sorry if I do something bad bit I have never flash a ROM or something like that.
[Sony Xperia L] EternalXDA:
I assume that you're on stock firmware. download the latest firmware (its biuld number is X.X.17, search for it here on xda...)

download and install the FlashTool on your pc, then use it to flash the downloaded firmware into your phone. (there's few threads on how to do so.)
[Sony Xperia L] PeterLda:
Could you please link me one of those threads? Because I don't have much time...

I thank you a lot form the help, hope that my phone can be fixed
[Sony Xperia L] EternalXDA:
Download the 15.3.A.1.17 firmware from here and here's the guide on how to flash it into your phone. and hit the thanks buttons. if you have time! :o
[Sony Xperia L] PeterLda:
Hi, sorry but In the thread no one answers, and when I connect my phone holding vol-, Windows doesn't recognize it, also after the first time y holded vol- and plugging the phone, it stopped showing any light on the LED, when I plug the USB, it shows Red light, then green light and finally orange light it changes very fast and then it stop showing any light, what should I do? thanks for the help!

-----------------------

Oh, and I forgot, for a little time when I tried to turn on the phone or to charge, it didn't turned on or charge, just... didn't do anything

Know it turns in, obviously still bricked, stuck at bootanimation and charges normally.

So... how can I make flashtool work? Or at least make Wiindows recognize my phone :(

Thanks!
[Sony Xperia L] killing.devil:
u wer going correct

u wer doing the right thing, the red to green light change signifies that u are in flashmode

the light goes off, dont worry u are still in flashmode

u will be out of flash mode after u have disconnected ur phone from ur pc
[Sony Xperia L] Tidzsi:
Have you installed xperia l drivers?

Check it. If it doesn't work after this, try it on an other pc.
[Sony Xperia L] PeterLda:
How can I install them? I tried but I can't install the drivers, don't know how :(
[Sony Xperia L] PeterLda:
Flashtool

Installed them from flashtool drivers setup.

But windows is still not recognizing them, so... I still have to try on another pc but I don't know if it will work.

Also, I was trying to install them manually but I don't really know how to make it work
[Sony Xperia L] rethinkk:
bro insert the battery and wait ten seconds and try to this :

if your pc doesnt recognise your phone try to plug other usb hub

and press vol.down and plug your phone to pc

edit: did you hear that any sounds when your plug your cable to pc ?
[Sony Xperia L] PeterLda:
Any sounds from the phone? Nope, just the light turned red like always, and showed the charging icon, then turned off (like it does normally) and Windows shows "Unknown USB".

Thanks for the help!
[Sony Xperia L] rethinkk:
No bro from the pc when your phone connect to pc.did you try hold vol.up button and connect to pc, anything was changed?
[Sony Xperia L] PeterLda:
I just hear the sound windows make when a non-recognized device is connected :( like a negative sound? xD (don't know how to explain sounds~~~)
[Sony Xperia L] rethinkk:
ı understood bro,never mind :) did you install twrp or Custom recovery?
[Sony Xperia L] PeterLda:
No, I didn't, just the things that I listed in the original post, my problem now is that windows doesn't recognize the phone... is that normal? do I have to do anything with flashtool or something? :(

Thanks for the help bro, I do really apreciate it!
[Sony Xperia L] rethinkk:
it is not normal bro,but your device didnt brick too I think.if your bootlader locked,you can try sony update servıce program dude :)
[Sony Xperia L] PeterLda:
With brick I mean that it's stuck at the bootanimation D:, it just loops (the bootanimation, the phone it's not in a bootloop)

So, you mean Sony PC Companion? It doens't recognize my phone :crying: Is there a way to make it work?
[Sony Xperia L] rethinkk:
no bro but sony had removed it :)

which windows version do you use ?

EDİT:try this steps http://xdaforums.com/showpost.php?p=43439187&postcount=6
[Nexus 9 General] andy o:
So now if one doesn't want notifications in the lock screen, one also loses playback controls. If you only allow non-expanded notifications, you only get crippled playback controls. FFS, the loss of lock screen widgets might be forgiven if at least there was a smart alternative.

/vent

On the other hand, now the stereo channels get reassigned to the correct speakers no matter the landscape orientation, so yay, I guess?