yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Nexus] imported0:
Thank you so much!!!! Fixed all the purple on auto brightness!! I really recommend this kernel to everyone!! It really works!
[Samsung Galaxy Nexus] Wdustin1:
Trinity! I got lucky with my gn and I didn't have to much purple. My wife's gn was BAD, flashed trinity and boom no more purple.
[Samsung Galaxy Nexus] imported0:
Now Im getting some weird black dot/shapes on low brightness + dark surface, it was there before,but now is much more visible, becouse of the contrast I think. But I dont mind. At least there is no more purple :)
[Samsung Galaxy Nexus] kirana01:
does it need more adjusment or just flash it and purple tint will gone?

Thanks in advance
[Samsung Galaxy Nexus] imported0:
Just flash it. You could download trinity kernel toolbox and reduce the contrast.
[Samsung Galaxy Nexus] scoobdude:
This is called black crush. There is a setting to help with this. Try playing around in there. It is possible to get rid of it. I used cm10's built in stuff.
[Samsung Galaxy Nexus] imported0:
What exactly should i mess with? Contrast or colors?
[Samsung Galaxy Nexus] gpzbc:
Every screen is different, but another user posted their CM10 settings a few pages back.

http://xdaforums.com/showpost.php?p=30561145&postcount=270
[Samsung Galaxy Nexus] scoobdude:
In addition everyone's tastes are different. Just play around with the settings and make sure you give it time for you to adjust to the settings. I think the black crush was mostly caused by too much gamma reduction though. I saw it pop up a lot with the default wallpaper (the purple one).
[Samsung Galaxy Nexus] coldrazor:
guest

Franco stock colors with minus (-) values on trinity`s contrast
[Samsung Galaxy Nexus] imported0:
I know this is a noob question, but... will something happen to my phone if I have it on -32 contrast in trinity kernel toolkit?

When I unlock it, I can still see the clock from the lockscreen on the homescreen, and other stuff like that just locks on the screen for short time (cca. 5 seconds). Is that because of the contrast?
[Samsung Galaxy Nexus] gm007:
Yes i think so,leds will leave traces.but why would you put it -32?
[Samsung Galaxy Nexus] imported0:
Only on -32 the purple is gone on auto brightness for me. So it's bad for my phone? I also see traces on stock setting (-24)
[Samsung Galaxy Nexus] gm007:
Try trinity contrast -10

gamma r5 g5 b0

Multipliers r178 g169 b200

If the traces persist that means your screen is faulty.
[Samsung Galaxy Nexus] blankit:
This usually happens because when the phone heats up it messes with the colors on the screen....I'm on my second gnex and my other one got so hot that my colors just started fading...I've been careful not to use this one to the point of overheating.
[Samsung Galaxy Nexus] imported0:
No traces on this config, but there is too much purple now :(

So, if I use -32 contrast something can mess up my screen? Because only on that I dont have anymore purple..
[Samsung Galaxy Nexus] sblantipodi:
Is it possible to adjust contrast and other settings with rooted stock ROM?
[Samsung Galaxy Nexus] imported0:
I dont think so. Install trinity kernel and install trinity toolbox and then you will be able to play with the colors.
[Samsung Galaxy Nexus] sblantipodi:
don't want custom kernels.
[Samsung Galaxy Nexus] imported0:
Well, this one is very stable,working perfectly and it removes the purple problem. I don't know why you don't wan't custom kernel, you have allready rooted so warranty is gone anyway.

But it's your choice. Cheers :D
[Samsung Galaxy Nexus] donsh00tmesanta:
stock jb is so stable, effcient (best battery life Ive seen on gnex so far) already. Rootings a given but maybe he does not want to ruin that.

Plus those kernels are based from older JB builds.

---------- Post added at 08:40 PM ---------- Previous post was at 08:40 PM ----------

but is the flashing of a kernel the only way?
[Samsung Galaxy Nexus] imported0:
Someone said something about editing the build.prop or something like that. Go to the trinity kernel thread and it's there on the last few pages..
[Samsung Galaxy Nexus] donsh00tmesanta:
Thx

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Vaj tswv is the creation of people with nowhere left to turn

---------- Post added at 04:22 AM ---------- Previous post was at 03:37 AM ----------

I cannot find the reference in that thread :(

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Vaj tswv is the creation of people with nowhere left to turn
[Samsung Galaxy Nexus] sblantipodi:
is there a way to remove banding?
[Samsung Galaxy Nexus] imported0:
I read the whole thread and best thing I found is this, editing it with sysfs using this http://pastebin.com/HQvkQwcn

But I think you still need trinity kernel to do it..

---------- Post added at 02:10 AM ---------- Previous post was at 02:08 AM ----------

If you explain to me what do you mean by banding I might help you.
[Samsung Galaxy Nexus] donsh00tmesanta:
Dang it so its the only way? Flash a new kernel?

I guess I'll wait till they updated to ota build

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Vaj tswv is the creation of people with nowhere left to turn
[Samsung Galaxy Nexus] sblantipodi:
I agree that banding is not the correct word to describe the problem since banding identify another problem on computer monitors

but this is usually the terms used by people to describe this GNEX problem.

For banding, in this case, I mean gray lines that appears over white screens and gray screens.
[Samsung Galaxy Nexus] imported0:
Well I have OTA JellyBean rom.

---------- Post added at 01:37 PM ---------- Previous post was at 01:35 PM ----------

That is not the problem, english is not my native language so I actually dont know what the word banding mean.

Are the lines appearing on low brightness or are they always there?
[Samsung Galaxy Nexus] sblantipodi:
If I raise the brightness the lines are less visible but still there.
[Samsung Galaxy Nexus] imported0:
Can you take a picture of the screen so I can visualize what you are talking about?
[Samsung Galaxy Nexus] sblantipodi:
no, I'm not at home and I don't have a camera.
[Samsung Galaxy Nexus] imported0:
Then i cant help you, you can try custom kernels but most of them can only customize colors, so I dont know how could that help you with your problem.
[Samsung Galaxy Nexus] sblantipodi:
If you don't know the problem I doubt you can help me in any case :cyclops:
[Samsung Galaxy Nexus] imported0:
Sorry :s
[Samsung Galaxy Nexus] Crwolv:
I'm a little lost my Nexus sprint, toro Plus, has pure white interior blacks in the screen is absolutely gorgeous. penTile technology is why I bought this phone. I had it on my Photon and when you put this phone next to the H T C design 4 G the white is pure white compared to the off white of the htc regular Qhd Lcd display although you couldn't tell its off white unless you put it next to the photons pure white and my Nexus. my photon was a QHD butt had pentile and was perfectly white even though my wife's design wasn't pentile so unlike the photon my Nexus isn't pixely at all because it's high definition it has 316 pixels per inch 320 DPI. I feel for you and I think it sucks that you are having screen trouble along with others grainy or purple screens I don't know maybe it's the luck of the draw I feel for you all.

---------- Post added at 12:32 AM ---------- Previous post was at 12:24 AM ----------

I don't know what is up with all your nexus is but mine is absolutely perfect so maybe it's the older ones wow that sucks
[Samsung Galaxy Nexus] scoobdude:
Photon was pen tile, had olephobic screen, LCD, but most importantly it was RGBW pentile not RGBG like the nexus. So you are comparing 2 different screen technologies and 2 different versions of pentile screens.
[Samsung Galaxy Nexus] donsh00tmesanta:
I got used to it

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iphones are the creation of people with nowhere left to turn
[Samsung Galaxy Nexus] :
Just wanted to chime in here:

I have MASSIVE vertical banding while in landscape mode and my left side is clearly tinged blue while the right side of the screen is clearly tinged yellow.

Finally, there is a vertical bar of pixels that are stuck on max brightness or have some kind of light bleeding going on because they are ALWAYS bright, even when on minimum brightness and they stick out like a sore thumb.
[Samsung Galaxy Nexus] Crwolv:
Weird. You either have a really messed up screen or yur roms kernel is screwed up. flash Franco kernel get his app in the play store you can fix any screen tweak you like:)

---------- Post added at 04:35 AM ---------- Previous post was at 04:33 AM ----------

And? My main point was I love pen tile and gave my reasons. Take my tiny information however you like it helps some ,obviously it didn't help you, very sorry.:( also u forgot to add one is super amoled and 1 isn't and resolutions a different, you totally missed my point my apologies for not being able to convey it better. You win some you lose some but Android being open source in friendly people try to help even if it doesn't help someone
[Samsung Galaxy Nexus] :
I'm already using franco's kernel. Have been for ages.
[Samsung Galaxy Nexus] Askalaphos:
There is certainly some variation. Here are two phones side-by-side. Both are running the same JellyBean release and the same stock kernel:

Here is the sticker behind the batter for the phone on the left

and here is the one for the phone on the right:

Here are another couple of side by side photos where colour differences are apparent but not so noticable:

All these are with the phone set to "auto" brightness so if the extend to which the screen dims is supposed to be limited in software to avoid running a the screen in a brightness range where it performs poorly then this is not happening.
[Samsung Galaxy Nexus] nandcep:
Sorry to bump this post once again, I bought this phone yesterday from an online forum in my country. Noticed those purple and grainy occurred, but seems caused by software issue. Is Cyanogenmod ROM can fix the purple tint? Thanks! :D
[Samsung Galaxy Nexus] arzbhatia:
Mind posting a photo?
[Samsung Galaxy Nexus] anton2009:
Well.. I don't have a professional camera, but I took these two photos (1 at 100% brightness and 1 at 50% brightness) with my Macbook Pro camera, and this is what I got. Its not nearly as noticeable as the pictures look like, but I can definitely see the "purplish" color around 0-10% brightness.
[Samsung Galaxy Nexus] arzbhatia:
Yeah, I can see the purples. I just tried out popkorn kernel or whatever it is called. The screen color management in the kernel is great! The greys seem much better!
[Samsung Galaxy Nexus] ArmanUV:
what's the big deal? almost all the costume kernels have colorcontrol from ezekeel. Just play around with the numbers until you get a neutral white. Purple tint is not indicative of a defective screen, just sloppy factory calibration.
[Samsung Galaxy Nexus] arzbhatia:
Sorry for being a noob but how exactly so we change the values? Do we need to download some app or something?
[Samsung Galaxy Nexus] maretus:
I would also like to know as my greys also appear purple on low brightness. I've seen 5 nexus' and not all of them have this issue. Just some of them. I've tried adjusting gamma with Franco kernel but it doesn't help much and the color value changer has to be adjusted at every boot. Is there a way to adjust things so they stay that way or am I stuck with a purple tint on my greys forever?
[Samsung Galaxy Nexus] NICEGYPT:
Mine does not have any of these issue at all. I went through 3 T-Mobile SGS2 because of this issue. But my nexus more than perfect. Mine is the Canadian version thou.

Sent from my Galaxy Nexus
[Samsung Galaxy Nexus] melvie:
Is the problem only there on low brightness or at all levels?

I have grainy / purple screen also but only @ low brightness levels 20<%. The lower it goes the more you see it and i think that's why the stock autobrightness isn't lowering the screen to the max because of this.

I think it has clearly something to do with the leds in the screen that react different on low brightness values.
[Samsung Galaxy Nexus] ArmanUV:
you need franco's kernel, glados or leankernel(experimental version).

franco has a great paid app in the market which is the easiest way if you're fine with paying for it.

For lean kernel you can flash Leankerneltweaks (search rootzwiki to find it) and that gives you a command line utility which is also easy to use.
[Samsung Galaxy Nexus] Ravynmagi:
I used this guide with the Franco kernel and tried tweaking the colors, but all I could do was make the problem worse. And oddly a thread about color tweaking doesn't even mention the purple issue at all.

http://xdaforums.com/showthread.php?t=1521195

I looked up the LeanKernel thread on Rootzwiki, but could find no information on it's command line tweaking.

Not feeling very optimistic these color tweaks will really resolve the issue satisfactory. My worry is even if I get it looking okay at 50% brightness, what happens at 100% brightness, will I then look really washed out because the red and blue are now turned down too much?

I suspect replacing the phone is probably unavoidable.
[Samsung Galaxy Nexus] arzbhatia:
Fix

Okay there is a possible fix for this. Well, kind of. Go to rootzwiki and flash the GLADOS kernel. Then find the screen calibration thread in the development t section of XDA and follow the instructions. You won't notice much purple ness till you take the brightness to as low as 2-3%, 5% gives good greys and blacks. Try it out. The grainyness is hardly noticeable too!
[Samsung Galaxy Nexus] ArmanUV:
I don't how strong this purple tint is but all the displays are slightly different. If you can't correct it with a slight colour control tweak then you should get it replaced.

leankerneltweaks has a seperate thread : http://rootzwiki.com/topic/17176-kerneltweaks-leankerneltweaks-v90-remastered/

Don't forget you need the experimental version of leankernel for colourcontrol.

I recommend 1.10exp2 or the latest exp.
[Samsung Galaxy Nexus] maretus:
Mine only has the purple issue below 5% brightness in dark rooms and while it does bug me because I do keep my brightness that low sometimes I'm not risking another return. I'm on my 4th nexus and so far this one doesn't have all the problems the other 3 had. I can deal with a little bit of purple below 5% brightness. My luck I'll exchange and get a worse screen or signal issues again.
[Samsung Galaxy Nexus] exb0:
Oh my god this is insane. I just got it yesterday and I noticed the purple tint. Wtf. Been trying various kernels and nothing seems to work.
[Samsung Galaxy Nexus] Ravynmagi:
Thanks arzbhatia and ArmanUV. Unfortunately I think the purple tint is too great for color calibration to really help. Was so hoping to avoid returning the phone (since I can't exchange it).

Unfortunately it seem once I turn the red and blues down enough to mostly clear up the noticeable purple tint on my menus and dark grey screens, I start noticing that things are now looking too green.

And it doesn't help that I have a Galaxy S Vibrant right next to me with what seems to be an absolutely perfect AMOLED display. So when I compare the two, I feel quite disheartened at how bad the Galaxy Nexus looks compared to my older phone.
[Samsung Galaxy Nexus] exb0:
Just replaced my Galaxy Nexus. Oh boy is it different. <3
[Samsung Galaxy Nexus] arzbhatia:
:O ! Do you by any chance a photo of the problem you faced? And can you click another one to show how it looks like now?
[Samsung Galaxy Nexus] matthewr87:
I actually exchanged my phone 6 separate times before I found one that I could tolerate. All 6 of them (including my current one) had a purple tint at low brightness. However, in my experience there is a large difference in the "degree" of purple between phones. The worst one was purple even at 30% brightness and the screen was very grainy and washed out. My current one has a darker and sharper screen but is purple at the lowest brightness setting.
[Samsung Galaxy Nexus] exb0:
True, my current one has purple tint but only at the lowest brightness. After flashing a custom kernel the purple is back, but cyanogen screen calibration thingie fixed it.

Sure! I'll post it up soon :)
[Samsung Galaxy Nexus] cmstlist:
My first GN from Wind Mobile had no purple of this sort, but I took it into warranty because of the boot loop brick issue. The replacement has noticeably different colours. Definitely seeing the purple effect. Also on a fully black screen such as in the app Multitouch Visualisation Test, there is a certain patchiness to the black background.

All that said, purple is actually a colour that kinda suits me :-)

My main concern is stability, so if the unit doesn't brick like that last one, it's already a cut above what I had before!
[Samsung Galaxy Nexus] brunsbanjo:
got the same problem, different kernels, different color settings.

but my gnex is soon in a rma (for my not recording voice hardware bug...), so i will report back if they changed the whole device.
[Samsung Galaxy Nexus] cablemike01:
this is an amoled issue. I've had a few phone with amoled screens and they all have color issues when screen is dim. LCD have issues too, so just learn to live with it. I would be more concerned with the burn in your gonna get over time on the amoled screen.
[Samsung Galaxy Nexus] fixmypcnow247:
Purple issue is a defect return it asap.

I bought a galaxy nexus from Google play had to go through 6 phones to get a good one what a pain in the pooper i am so happy i got a good one no banding no purple good whites think i got the only good one my advice is buy one off Google play they have good customer service and mailed the replacement overnight 5 times think they lost a lot on shipping he he. Don't keep one till your happy just return them up till your 14 days if you don't get a good one get a refund and start the process over 6th time is the charm lol stupid Samsung.

PS. it is a manufactures defect my 5th one had some dead pixles banding and purple hue totally unacceptable.
[Samsung Galaxy Nexus] xtravbx:
Totally a manufacturing defect. Screen looks terrible on this phone I'm sorry. I'm on my 2nd and my 3rd will be here tomorrow. I feel annoying for calling in and wanting it replaced, but for almost 450 after tax I feel the screen shouldn't have grain and discolored patches. My 2nd one has terrible horizontal bands. Total junk.
[Samsung Galaxy Nexus] Steve Jobs®:
Goodbye Nexus. I am having too many issues with the grainy screen and banding. I'm going to return my Nexus for my money and go back to a crappy phone until something better comes out. I love the stock ics but too much hardware issues.
[Samsung Galaxy Nexus] EliWay:
These are all issues related to SAMOLED. Luckily my Galaxy nexus gets purple only at the very lowest setting. It also gets grainy at low (<20%) brightness , but I actually got used to it , mostly because it doesn't lose sharpness, it just seems like you're looking at paper, almost exactly like a newspaper looks.

With all of these issues, I still think the screen is just gorgeous! And I'm usually VERY nit-picky about these things. If you think you don't like the screen on the Galaxy Nexus, Try playing a trailer for Pixar's "UP" in HD on the youtube app. It will make you appreciate the screen you have. :)
[Samsung Galaxy Nexus] robrob777:
Same here, I have a Docomo.

I had the Nexus S also with a pentile screen and it didn't have this problem.

blacks were darker, no purple tint and no grainy pattern at all in the NS.
[Samsung Galaxy Nexus] xtravbx:
Yeah I did the same thing. I had to return it. Went back to my iPhone 4. Not because I'm an apple fanboy (I love androids openness) - but the hardware is much better.

I'll get my next android phone at a brick and mortar to make exchanges etc easier.
[Samsung Galaxy Nexus] Ashtrix:
Guys , you must already know that LED's do degenerate and have many issues like yellow , purple , burn in's but the greatest advantages of SAMOLED's are these screens offer the best blacks and color saturation & save your juice than that of any other crappy IPS SLCD's , LCD's out there FU iPhone ;) ....!

they all just need some color calibration :D

I'm going to get my Galaxy Nexus GSM in a couple of days :cool: .

Whoa , Nexus is the best device that you can get !!
[Samsung Galaxy Nexus] DeadSOL:
Okay, my friend just bought a Galaxy Nexus. I checked that LCD black test. On my Galaxy S, the colours are perfect. On his Galaxy Nexus, there is some purple tinting on both the LCD test and in Android settings.

His menus are pure black and screen is basically perfect but that LCD test somehow shows purple tinting on his phone (doesn't do that on my Galaxy S).

Do you reckon he should return it?
[Samsung Galaxy Nexus] arzbhatia:
If he can return and get a replacement , he should!
[Samsung Galaxy Nexus] DeadSOL:
Are you sure? The tinting doesn't show up anywhere else. His app-drawer is PURE BLACK. No issues whatsoever.
[Samsung Galaxy Nexus] Ashtrix:
Yeah, purple disease has also affected my Gnex too!!

@ lowest brightness [say <20% ] white's got a very little bit washed out / grainy tint and the last row of black squares had a purple tinge ....:eek: , but the color saturation & sharpness are maintained .

So , guys what's your opinion on my Nexus ??
[Samsung Galaxy Nexus] marcusva79:
Mine had that purple tint to but using different kernels has helped really good. Didn't want risk getting a worse one.
[Samsung Galaxy Nexus] Ashtrix:
I'll get it rooted right away and post the changes.....:rolleyes:
[Samsung Galaxy Nexus] ThatTechShow:
Hey guys. So I'm having that same purple colors with my blacks when the brightness is lowered. Someone was saying different kernels for the GNex can help with this issue?

I'm using the Franco Kernel at the moment with AOKP ROM
[Samsung Galaxy Nexus] arzbhatia:
Which kernel did you use?
[Samsung Galaxy Nexus] marcusva79:
I have used Franco's kernel and samurai as well. Just got to adjust some gamma settings and all
[Samsung Galaxy Nexus] arzbhatia:
Can you post your values please?
[Samsung Galaxy Nexus] Ashtrix:
My SGS's SAMOLED was having a bluish tint & my friend's Nexus S was having a yellow one till it got fixed by Voodoo color mod / CM color , i think color adjustment on Pentile SAMOLED's must always be calibrated via some Mod......:)
[Samsung Galaxy Nexus] DeadSOL:
Can someone please post if changing the kernel and gamma values resolves the issue or not?
[Samsung Galaxy Nexus] arzbhatia:
It won't FIX it. It's just a band aid.
[Samsung Galaxy Nexus] marcusva79:
See I was using

205

215

245

2

2

-3

I am now using samurai kernels and changed my gamma via root explorer. Looking good so far.
[Samsung Galaxy Nexus] monstah_rain:
I found the best way to find out if you have this issue is to download an app called Screen Filter and turn your brightness down to 10% in the app.

My phone does have this issue. However, I will not be returning it since it doesn't really bother me. Also, I afraid they'll be sending me a refurbished phone.
[Samsung Galaxy Nexus] thetrailofdead:
I'm on my 5th replacement and Samsung want some to take a picture of the green tint across the top of the screen. I'm not sure how well it will show up in the pics but ill find out tonight.

They sent me 5 new phones through the advanced replacement and each one had issues. Purple is an issue but I could never get anyone to admit it was a known issue. There are varying degrees of purple. I've found that the two units that I've seen that are not purple have pretty significant ghosting issues. These two with ghosting have the best neutral colors.

The guy at Samsung said that because I'm outside of the 14 days, he'll need pictures to sent to the engineer who will look onto the issue. It looks like my run with replacements is over. I need a phone and can't really be bothered with sending it in only to have them wipe my phone and send it back after determining that there is no issue, which I have a strong feeling they will do. I'm probably going to keep one of the two I have now for a couple months and sell it when the next best thing comes.

Samsung quality control is pretty much non existent IMHO.
[Samsung Galaxy Nexus] arzbhatia:
Use this image mate -