[Q] Lowering actual panel brightness (below minimum) - Nexus 4 Q&A, Help & Troubleshooting

Hey guys,
I've searched these forums quite thoroughly, and I haven't found any kernels/ROMs that allow for the display brightness to go past its minimum brightness settings. If you've had an iPhone, you'll know that the iPhone's minimum brightness is so much lower than the Nexus 4's. It makes using it at night so much easier on the eyes.
In all the threads I've come across, people just suggest to use Lux, or any of the other apps that just put a filter over the screen. These just make the screen grey, and just mute the colours - they don't actually reduce the brightness past 0.
I know that lowering the minimum brightness is possible; at least it is on other devices. On the Nexus 7, M-Kernel has a file that you can edit to change the panel's minimum brightness, and on my old Xperia Play, the RootDim app [https://play.google.com/store/apps/details?id=mobi.pruss.superdim&hl=en] allowed lowering the panel's brightness.
So, has anyone come across any kernels/ROMs that actually allow reducing of the panel's brightness past 0?
Oh, and I emailed the guy who made the RootDim app, and he mentioned something about pwm drivers. Does anyone know more about that?
Thanks!

I think I was able to do this on my old phone (HTC Wildfire) using Cyanogen. But no guarantees. Also, no idea if that is still supported or works on the N4...

If it's purely about using it at night I would recommend Screen Filter. I prefer not to mess with forcing my screen to use values outside the tried and tested boundaries set by the manufacturer.
Sent from my Nexus 4 using Tapatalk 4

For what it's worth, the "lowest" brightness by default is 5%. CM lets you adjust this down to "0%" but it seems autobrightness is a little buggy.
edit: nevermind. The range for autobrightness is 5-100 by default. When manually setting brightness, I believe "0" is possible on stock? I agree there are times a dimmer setting would do. Changing gamma settings can get you deeper colors and result in a dimmer looking display. Opposite of the graying you're referring to.

thank me later
https://play.google.com/store/apps/details?id=com.haxor

K3lthuzad said:
...or any of the other apps that just put a filter over the screen. These just make the screen grey, and just mute the colours - they don't actually reduce the brightness past 0...
Click to expand...
Click to collapse
bodom_hc said:
thank me later
https://play.google.com/store/apps/details?id=com.haxor
Click to expand...
Click to collapse
or never

I'm wondering about this too, in bed at night the screen is too bright on the eyes which makes the reading time much less,
on amoled screens its great due to no backlight which doesn't make the eyes tired,
there must be a way to reduce the backlight, but it may make the backlight flicker if undervolted, which would be worse on the eyes

republicano said:
I'm wondering about this too, in bed at night the screen is too bright on the eyes which makes the reading time much less,
on amoled screens its great due to no backlight which doesn't make the eyes tired,
there must be a way to reduce the backlight, but it may make the backlight flicker if undervolted, which would be worse on the eyes
Click to expand...
Click to collapse
Have you tried playing with the gamma settings and dropping the brightness down to 0 manually (autobrightness only goes down to 5%).
Halfbreed is pretty decent and results in a "dimmer" display without washing/graying everything. Only problem is under daylight, it's not effectively as bright.

I'll try messing with the brightness and gamma settings. It's a shame there isn't a better alternative right now.
Maybe, in the future, a developer makes a kernel with this built in (if possible). Fingers crossed! :/

For what it's worth, I think you'll find 0% brightness and halfbreed to be exactly what you're looking for.

Download twilight and try it. It has an option to lower the screen brightness further...
Sent from my Nexus 7 using xda app-developers app

Bumping my own thread:
I talked to the Nexus 7 (2012) kernel dev who managed to lower the panel minimum brightness, and he pointed me toward this:
https://github.com/CyanogenMod/lge-...ch/arm/mach-msm/lge/mako/board-mako-display.c
I'm hoping a Nexus 4 kernel dev will see this (or someone who knows what to do with it). He said it might be possible to do on our displays. Also, go check out M-Kernel if you still have a 2012 Nexus 7.

So, we just need to chance it and compile the kernel?
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Sent from my Nexus 4

We can try. I just don't know how to 1. Change it and 2. Compile a kernel LOL

I will try to do it, will post here if it works
Sent from my Nexus 4

Related

Display: SuperAmoled Plus vs NOVA (LG)

This is a little test that I've made with Optimus Black and Samsung Galaxy S II
Hope you like it
http://en.androidworld.it/2011/05/2...oled-plus-samsung-galaxy-s-ii-our-comparison/
Seems to me like you forgot to change the browser brightness?
Sent from my GT-I9100 using XDA Premium App
MaBlo said:
Seems to me like you forgot to change the browser brightness?
Sent from my GT-I9100 using XDA Premium App
Click to expand...
Click to collapse
YUP 100% the browser brightness is very low hence why its darker lol
yup, either browser brightness is low or you enabled "auto power savings" in display which displays darker whites to save energy...either way my whites are proper white even on low brightness so you must be doing something wrong in your test.
That, or the camera under exposed the amoled screen because of the brightness of the nova display. Keep in mind that good LCD screens like Retina display or the blackberry ones are about twice as bright as a super AMOLED screen, so the Nova display might be even better than that (but on the other hand the blacks are infinitely darker on amoled, which makes the contrast ratio infinitely better).
sorry but that looked so biased towards the optimus in the last 2 tests, if you had the SGSII at full brightness in the web browser test it clearly would of won by miles. Aswell as in the sun light test.
Edit: I retract most of that to make it in all of the tests xD.
In most of the pictures the LG Nova screen has very washed out colours especially the first one. Samsung Galaxy S II also hasn't been put on full brightness for this as the other phone obviously has. If you were trying to get away with thinking your LG Optimus Black screen was better than Super Amoled Plus then you've failed.
I set the same (maximum) brightness
It's how BlueScreenJunky said. I tried to set the brightness setting also on the camera but the result was the same
cisoprogressivo said:
I set the same (maximum) brightness
It's how BlueScreenJunky said. I tried to set the brightness setting also on the camera but the result was the same
Click to expand...
Click to collapse
I really don't want to have to take pictures in all seperate conditions to show you what a real SGS II on 100% brightness looks like. -.-
cisoprogressivo said:
I set the same (maximum) brightness
It's how BlueScreenJunky said. I tried to set the brightness setting also on the camera but the result was the same
Click to expand...
Click to collapse
what he meant was that there is a second setting related to power that affects screen brightness
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I don't care if the NOVA screen can wash dishes, it still comes attached to an LG phone. After my experience with the G2X and reading the O2X boards, I can't believe people are still buying LG high-end phones. LG should stick to TVs.
cisoprogressivo said:
I set the same (maximum) brightness
It's how BlueScreenJunky said. I tried to set the brightness setting also on the camera but the result was the same
Click to expand...
Click to collapse
did u check that the browser brightness is set to maximum as well? Hmm I just turned mine up all the way and the whites were so bright I thought the rapture was happening after all!
Pictures don't mean a thing unless they're taken with the same camera and the same manual settings? here are 3 pictures of my SGS2 at 100% brightness with the same camera, same shutter speed (1/400 sec), same iso (400 iso), I only changed the aperture (f/1.8, f/2 and f/8):
Doesn't look that bright to me in the last picture...

Nexus S 4G screen accuracy

So I took the time tonight to measure the color accuracy of my Nexus S 4G with my equipment. So without further a due:
Luminance
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Color Temperature
Gamma
RBG balance and DeltaE
(All measures used against the Rec709 standard. Using Nexus S with a slightly modified voodoo colors profile)
Cool, looks like the Nexus did pretty well
btw the images aren't loading from me, I have to right click them and open them in a new window to see them.
Pictures should be fixed, or at least showing up as more than just links now.
I have no idea what this means.
Its usually a test done for TVs to see how close your TV is to the reference standards.
In the first picture it tells you how uniform the brightness of the image increases.
The second one is how close the color is to pure white (equal balance between red, blue, and green) at every 10% increase in brightness.
The third graph is gamma. A little harder to explain but this basically shows if the display will appear darker or brighter as a whole.
The final shows the actual outputs of red, blue, and green at each brightness. The lower portion shows how much it deviates from reference.
(Any HT junkies out there, yes I know I'm using the term brightness incorrectly here only to make this more accessible)
Sent from my Nexus S 4G using XDA App
so, do you think you can make a color profile that is in every way perfect?
Not with the kernels I have seen. Most only have one point of change (ie color multipliers in Voodoo). Something perfect would take quite a bit of battery use I would imagine as most image processors that can create "perfect" picture are usually stand alone units costing $1000 plus.
I can also tell you each screen is not the same so what might be a perfect profile on my screen would be different for you. Depending on plenty of things including screen age.
Heres my Voodoo settings I used for the measurements I took
Color profile: Voodoo v1
RGB multiplier:
R=1769117440
G=199667
B=216805280
I did not touch the Gamma settings for the measurements but there is room for change there.
wingman1659 said:
Not with the kernels I have seen. Most only have one point of change (ie color multipliers in Voodoo). Something perfect would take quite a bit of battery use I would imagine as most image processors that can create "perfect" picture are usually stand alone units costing $1000 plus.
I can also tell you each screen is not the same so what might be a perfect profile on my screen would be different for you. Depending on plenty of things including screen age.
Heres my Voodoo settings I used for the measurements I took
Color profile: Voodoo v1
RGB multiplier:
R=1769117440
G=199667
B=216805280
I did not touch the Gamma settings for the measurements but there is room for change there.
Click to expand...
Click to collapse
curious wingman how do i optimize my screen. i would like to learn
Any chance you could do this on a SLCD Nexus?
devmonster86 said:
Any chance you could do this on a SLCD Nexus?
Click to expand...
Click to collapse
Joking right? Lol.
Sent from my Nexus S 4G using XDA App
wingman1659 said:
Heres my Voodoo settings I used for the measurements I took
Color profile: Voodoo v1
RGB multiplier:
R=1769117440
G=199667
B=216805280
I did not touch the Gamma settings for the measurements but there is room for change there.
Click to expand...
Click to collapse
Do you have a specific set of numbers you believe are the best for what is available currently through Voodoo?
Thanks for the great work.

Fix for black crush

Hi not sure if anyone recommended this yet but I use 2 x battery screen filter and set the filter t o white t hen set opacity to 90 percent and for youtube 80 percent and it take the black crush away hope this helps and spread it : p
Sorry dumb keyboard didn't type in white
What is this "2 x battery screen filter" where do e get it and if its an app does it need root ...please help i m feeling this phone as hopeless with this black gray pixels
My dear god, half a dozen english teachers woke up from their graves today and silently began the zombie apocalypse. I didn't understand **** of what you two said.
Kids today.
Kid zz 2 da y
Sent from my GT-N7000 using xda premium
this its about fixing black pixels in video playback on galaxy note...if u still didn't understand try to watch a dvd rip movie in a dark room
Tez
What is a 2x battery screen filter? Could you elaborate please?
Sent from my GT-N7000 using xda premium
I have been using the free "screen adjuster" , with contrast setting of -58 , other settings default, and my video`s play great now, no black crush , when i was really bad before.
John.
Tinderbox (UK) said:
I have been using the free "screen adjuster" , with contrast setting of -58 , other settings default, and my video`s play great now, no black crush , when i was really bad before.
John.
Click to expand...
Click to collapse
This drains way too much battery as it is seriously CPU intensive.
One reading this, I installed Watchdog, set to monitor all processes including system ones, I have been watching a few movies for 10-20mins and screen adjust is showing as using 0% cpu usage?
I am only adjusting the contrast not the colour, could that be the reason for my low cpu usage?
John.
PoisonWolf said:
This drains way too much battery as it is seriously CPU intensive.
Click to expand...
Click to collapse
just so everyone knows blacks usually use no power at all on an amoled display, however when you apply a screen filter everything black is now a slight tone of colour depending on which filter you added, this means that your screen will be using more power as every single pixel will always be on.
yeah, I know, but my video`s were really bad in dark scenes, total back areas of blotchyness, it was unwatchable, And i was really happy with my screen no yellow/green tinge or anything
John.
RudiRulez said:
just so everyone knows blacks usually use no power at all on an amoled display, however when you apply a screen filter everything black is now a slight tone of colour depending on which filter you added, this means that your screen will be using more power as every single pixel will always be on.
Click to expand...
Click to collapse
Just been experimenting, Im using the trial version of 'Privacy Filter' and ive got it set to white and lowered it to just barely above the bottom of the scale, and well......OP is certainly on to something, on the gamma test image I can see every step as it should be yet ive got it set so low that it seems like black is still black as in I cant notice a difference between screen off and screen on on the black parts.
Things to note though, if you set the slider too low blacks become grey again and also the app im using gives my phone lag but as a proof of concept it deffinatley works and theres no reason why devs couldnt include something like this in there roms.
I will keep experimenting with different apps and settings, Im yet to try a paid app so that will be next, ill try and get some photos up in a bit.
---------- Post added at 02:05 PM ---------- Previous post was at 01:46 PM ----------
Photos:
Side by side comparison, Without filter <-----------------------------------------------------> With filter.
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And the filter settings im using.
Edit: After some more experimenting 'Privacy Filter' by S-LINK SOFT for 85p is the one im going for, I set all the colours to 255 and set the alpha to 3 and it sorts my problems, also the app allows you to choose which apps you want it to activate in, obviously you should do some testing for yourself but this certainley sorted mine.
Edit: Still really bad blotches on certain parts of certain videos, not a solid fix overall.

Higher brightness screen in KK

Today I compared two Moto G (mine with german KK, the other one from my mother with 4.3). Surprise: minimum/maximum brightness is higher in KK. This means that SOC time will be reduced at the end of the day for most users... Can't complain though, if I got 6 SOT on 4.3 now I get around 5h on KK, which now makes sense because I didn't understand what happened.
It's just to see if anyone else noticed it as well, as it's easy to see.
Sent from my XT1032 using Tapatalk
is this also the case for automatic brightness? and does the brightness slider work together with automatic brightness, or are they separate options like in 4.3? thanks
rioachim said:
is this also the case for automatic brightness? and does the brightness slider work together with automatic brightness, or are they separate options like in 4.3? thanks
Click to expand...
Click to collapse
Automatic brightness is also higher, yes. With respect to 2nd question, it's like in 4.3, you choose whether to use automatic brightness or choose the level of brightness you want:
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tyrexs said:
Today I compared two Moto G (mine with german KK, the other one from my mother with 4.3). Surprise: minimum/maximum brightness is higher in KK. This means that SOC time will be reduced at the end of the day for most users... Can't complain though, if I got 6 SOT on 4.3 now I get around 5h on KK, which now makes sense because I didn't understand what happened.
It's just to see if anyone else noticed it as well, as it's easy to see.
Sent from my XT1032 using Tapatalk
Click to expand...
Click to collapse
Correct me if I'm wrong
But
1) On Moto G Kit kat makes the screen brighter > This means the screen is brighter > This will cause battery life OVERALL to fall... right? compared to 4.3 jelly bean
I find the screen brightness perfect for my needs right now at 4.3
Ummm
This is one area where the iPhone definitely wins.
Give users the ability to control the overall level of auto brightness.
Sent from my XT1032 using Tapatalk
That explains some things...
Can anyone check in 4.3 if the power consumption of the screen at the lowest brightness level is lower or the same?
Which app is that, let me know and I will test.
Bear in mind though that to really test you would need to use the same phone on 4.3 them upgrade it to 4.4. The reason is that each phone could possibly have it's screen calibrated slightly differently , ie maybe the OP's two phones would have different brightness even if both running the same android version.
However I do appreciate there is a (perceived) difference in screen time in the for the OP. But maybe its something else other than the screen in kitkat that is draining the battery quicker.
scott_doyland said:
Which app is that, let me know and I will test.
Bear in mind though that to really test you would need to use the same phone on 4.3 them upgrade it to 4.4. The reason is that each phone could possibly have it's screen calibrated slightly differently , ie maybe the OP's two phones would have different brightness even if both running the same android version.
However I do appreciate there is a (perceived) difference in screen on the for the OP.
Click to expand...
Click to collapse
It's called PowerTutor https://play.google.com/store/apps/details?id=edu.umich.PowerTutor&hl=es
I get same results on 4.3, ie its showing figure of 300.
But I don't trust the results. If I switch to auto brightness the graph still keeps churning out the same figures even though my screen brightens. Same if I use full brightness then switch to auto - new stats keep saying the same figure as on full.
??
One word lux
install https://play.google.com/store/search?q=lux&c=apps either lite or paid for
Ian
In GravityBox you can assign a new auto-brightness level.
I don't doubt this is true. But my battery is even better on kk so I'm a little shocked.
Sent from my XT1032 using Tapatalk
t-bon3 said:
This is one area where the iPhone definitely wins.
Give users the ability to control the overall level of auto brightness.
Sent from my XT1032 using Tapatalk
Click to expand...
Click to collapse
New Samsung phones allow the same.
Sent from my XT1032 using xda app-developers app
I don't understand again why they have made such a change for the worse in this area if it is true. I cannot detect a difference in brightness at the moment.
ijen0000 said:
One word lux
install https://play.google.com/store/search?q=lux&c=apps either lite or paid for
Ian
Click to expand...
Click to collapse
This ^
Sent from my Moto X cellular telephone...
I have the same impression with my girlfriend phone, but it isnt because the KitKat! Its hardware.
There are some units that the screen looks more pinkish (you can see when is turn off) and there others with a blueish screen.
The fist one has lower brightness,you can see in white pages.
There are probably different screens in different batches of the phone.
I find the screen too bright with auto mode on both JB and KK. I have been using lux (with default settings) for a few weeks now and it's great.
Sent from my XT1032 using xda app-developers app

[KCAL]Color Profiles for Pixel XL

This thread will encompass all of the color profiles used by various users of the Pixel XL. Feel free to share your own settings and recommendations here. I will link all profiles in the second post as users post them.
Profiles
XtraArrow: https://forum.xda-developers.com/showpost.php?p=70791467&postcount=3
Nitemare3219: https://forum.xda-developers.com/showpost.php?p=70805924&postcount=8
Kisakuku: https://forum.xda-developers.com/showpost.php?p=70811326&postcount=9
Alcolawl: https://forum.xda-developers.com/showpost.php?p=70823540&postcount=10
I always stay with "Cool" no matter what display, I can't stand the way warm looks. Here are mine.
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XtraArrow said:
I always stay with "Cool" no matter what display, I can't stand the way warm looks. Here are mine.View attachment 4022019
Click to expand...
Click to collapse
Is that your full profile? No changes to hue, saturation or contrast?
Well, I actually tweak red and green a lot to try find that sweet spot. I don't touch anything other than rgb scale although reducing saturation a little makes it look a little clean.
If anyone really experienced there have made a modification where the sRGB mode could even be improved with KCAL please do share. I like the sRGB mode as it is, but the whitepoint is far from being perfect and when you place it next to iP7 then it becomes more than clear. The default mode should be banished by the way, its the worst I have seen since them early Samsung AMOLED days.
Wish there was a profile which could place our phone near iPhone 7's accuracy/saturation/calibration.
ithehappy said:
If anyone really experienced there have made a modification where the sRGB mode could even be improved with KCAL please do share. I like the sRGB mode as it is, but the whitepoint is far from being perfect and when you place it next to iP7 then it becomes more than clear. The default mode should be banished by the way, its the worst I have seen since them early Samsung AMOLED days.
Wish there was a profile which could place our phone near iPhone 7's accuracy/saturation/calibration.
Click to expand...
Click to collapse
I am sure someone has a setting for this. Just need them to find the thread and reply.
250, 238, 256 is what I use.
You will never match the iPhone 7 display. It is calibrated, at the factory, per display. We can post settings all we want, but each display can look different than another. But sRGB on the Pixel XL has a definite green bias... this helps resolve it, at least in the white balance. With my Pixel XL next to my iPhone 7 Plus, the 7 Plus is still clearly more color accurate sometimes... and other times, they look pretty close. Just turn on sRGB, adjust the white balance to your liking, and leave it alone. That's the best you can do if you want color accuracy. We lack the granular control capability to do a proper calibration, even if you had the equipment, as far as I know.
Nitemare3219 said:
250, 238, 256 is what I use.
Click to expand...
Click to collapse
I use 246, 226, 256 to correct the green tint in sRGB mode.
Lets warm up.
I kind of miss the warmer hue my Nexus 5X had (It was, from a color accuracy standpoint, much more accurate too). The blue tint this screen has is a bit too much for my liking. After playing around for the last day or so I think I've found some settings that I like that reminds me of my N5X display.
I'm sure i'll be tweaking these slightly as time goes on, but I'm happy with what I've got so far:
Red: 235
Green: 247
Blue: 226
Saturation: 30
Value: 132
Contrast: 132
Hue: 0
sRGB: Off
?
Thank you for these profiles, they are good to test with, although every screen will be different coming from the factory. So tweaking might always be necessary.
Still, tweaking from a good base is way better than working from scratch.
Anyone using the default display mode with corrected green tint? What settings are you using?
I'm using 250, 235, 256 currently, through no delicate tweaking.
I don't like any yellowish, greenish profiles. Here are my profile, enjoy ?
Red 195
Green 178
Blue 215
Saturation 25
Value 129
Contrast 129
Hue 5
Sent from my Pixel XL using XDA-Developers Legacy app
How are you guys doing these changes? Found a thread and app on here but need kernel I guess but don't know which. I'm on elementalx.
jjayzx said:
How are you guys doing these changes? Found a thread and app on here but need kernel I guess but don't know which. I'm on elementalx.
Click to expand...
Click to collapse
I use ex kernal manager for tweaking elemental
Sent from my Pixel XL using Tapatalk
tatootie67 said:
I use ex kernal manager for tweaking elemental
Click to expand...
Click to collapse
Didn't know it was in there, guess I'll have to reinstall it. Thanks.
jjayzx said:
Didn't know it was in there, guess I'll have to reinstall it. Thanks.
Click to expand...
Click to collapse
You have to install it from the Play Store: https://play.google.com/store/apps/details?id=flar2.exkernelmanager&hl=en
Is there anyone who knows how to mess with the settings? All I'm interested in is to get the the white really accurate and white. Compared to my HTC 10 the pixel is a bit yellow. Cheers
Sent from my Pixel XL using Tapatalk
Blue305 said:
Is there anyone who knows how to mess with the settings? All I'm interested in is to get the the white really accurate and white. Compared to my HTC 10 the pixel is a bit yellow. Cheers.
Click to expand...
Click to collapse
Are you in sRGB mode? It should be more green, not yellow.

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