Hi All.
I have wondered why the software that controls the backlight, with the light sensor, doesn’t adjust the backlight to the lowest setting, when the phone is in total darkness.
I use my phone in complete darkness almost every night, but I think the backlight is way to bright. I know I can adjust it manual, but why not automatic?
Do any of you bright heads, know a reg value to change or another solution, so I can "allow" the backlight to go to the lowest setting, automatically?
I find this anoying also. Any help would be great.
Anyone? I have looked in the registry but cant find anything... :-/
as far as i know there is no software\tweak that can change backlite to min
Same here. In my case, I'd like the backlight to be a bit brighter in brighter conditions, especially when in the car on a sunny day and I'm using iGo. Manually, I can set the backlight higher. I had a sony ericsson phone with a similar light sensor, but you could adjust its maximum threshold and the general brightness. Surely there's a software solution here somewhere!
I searched a little and quickly found some things:
1. The Diamond seems to have an in-built process to adjust brightness according to light sensor. Don't know if it works, though.
2. The registry keys are found at "HKEY_CURRENT_USER\BackLight\". You can modify brightness there, and it will affect the control panel BUT not change your current brightness. There is an Event you must trigger to update brightness. In many devices, this is the BacklightChangeEvent, in some others, this is SDKBacklightChangeEvent, and some others something different. Depends on the device and the manufacturer.
I wrote an app to change the registry value and trigger both SDKBacklightChangeEvent and BacklightChangeEvent. I can see on the control panel the value has changed, but the visible Brightness won't change. Seems HTC decided to make their own DLL to manage that, instead of standard windows mobile events.
So, I searched a bit further and I found that into "HKEY_LOCAL_MACHINE\Drivers\BuiltIn" there is a key called "Frontlight" which is apparently defining a value which points to Backlight.dll. This must be HTC's implementation of the Backlight manager. I was like "yay this will be my first windows mobile dll reverse engineering" BUT, I didn't find this file anywhere on the device, unfortunately.
If anyone could find it on the Diamond, please pass me the info !
Scotchy49 said:
I searched a little and quickly found some things:
1. The Diamond seems to have an in-built process to adjust brightness according to light sensor. Don't know if it works, though.
2. The registry keys are found at "HKEY_CURRENT_USER\BackLight\". You can modify brightness there, and it will affect the control panel BUT not change your current brightness. There is an Event you must trigger to update brightness. In many devices, this is the BacklightChangeEvent, in some others, this is SDKBacklightChangeEvent, and some others something different. Depends on the device and the manufacturer.
I wrote an app to change the registry value and trigger both SDKBacklightChangeEvent and BacklightChangeEvent. I can see on the control panel the value has changed, but the visible Brightness won't change. Seems HTC decided to make their own DLL to manage that, instead of standard windows mobile events.
So, I searched a bit further and I found that into "HKEY_LOCAL_MACHINE\Drivers\BuiltIn" there is a key called "Frontlight" which is apparently defining a value which points to Backlight.dll. This must be HTC's implementation of the Backlight manager. I was like "yay this will be my first windows mobile dll reverse engineering" BUT, I didn't find this file anywhere on the device, unfortunately.
If anyone could find it on the Diamond, please pass me the info !
Click to expand...
Click to collapse
Thank you. Its a lot of attention you have given this topic. For that I thank you. - Just too bad you cant find that dll. :-/ Hope some other helps.
backlight.dll found in Windows folder
axelpix said:
backlight.dll found in Windows folder
Click to expand...
Click to collapse
Thanks, for reference, there are the functions:
Code:
BKL_Close
BKL_Deinit
BKL_Init
BKL_IOControl
BKL_Open
BKL_PowerDown
BKL_PowerUp
BKL_Read
BKL_Seek
BKL_Write
inside the Backlight.dll
This has to be a lot easier.
I found some reg settings in HKCU\ControlPanel\BackLight, one of them called "AutoBklOffset". Actually this is exactly what we're searching for here: When I enter a value >0 here, the backlight instantly goes brighter, and the automatic backlight setting is still active and works.
so, what we have to do is figure out how to enter a negative value here.
Ideas?
Hmm, I don't think we can get anything only with the registry, but we don't lose anything to try, do we ?
I'll check again the registry.
Ok. Actually AutoBklOffset is linked to "Auto backlight adjust". This means that if auto backlight adjust isn't ativated, AutoBklOffset won't do anything.
Ok, all this search was fun. But I told myself: what if I just go ahead and try if the already built-in app works ?
And yea, it already works. Meaning if you put the device in front of the sun, it will go bright, and dim if you're in a dark place.
So I guess this is a configuration specific issue and don't need a new app. I'm out of tha place !
P.S.: It would have been actually quite stupid to include a Light sensor but not using it.
Scotchy49 said:
Ok, all this search was fun. But I told myself: what if I just go ahead and try if the already built-in app works ?
And yea, it already works. Meaning if you put the device in front of the sun, it will go bright, and dim if you're in a dark place.
So I guess this is a configuration specific issue and don't need a new app. I'm out of tha place !
P.S.: It would have been actually quite stupid to include a Light sensor but not using it.
Click to expand...
Click to collapse
my works fine
u can test it on bright light...u will see the change when u cover uper part oh the phone....it will dimm and u will se almost nothing...
microlomaniac said:
This has to be a lot easier.
I found some reg settings in HKCU\ControlPanel\BackLight, one of them called "AutoBklOffset". Actually this is exactly what we're searching for here: When I enter a value >0 here, the backlight instantly goes brighter, and the automatic backlight setting is still active and works.
so, what we have to do is figure out how to enter a negative value here.
Ideas?
Click to expand...
Click to collapse
This tweak still dosnt make the phone use the whole scale. From dimmest to brightest. :-/
Scotchy49 said:
Ok, all this search was fun. But I told myself: what if I just go ahead and try if the already built-in app works ?
And yea, it already works. Meaning if you put the device in front of the sun, it will go bright, and dim if you're in a dark place.
So I guess this is a configuration specific issue and don't need a new app. I'm out of tha place !
P.S.: It would have been actually quite stupid to include a Light sensor but not using it.
Click to expand...
Click to collapse
You misunderstand the issue.
With the backlight set to auto try using your phone in a completely dark room - the light sensor will detect this and the phone dims. Okay, now remove the auto setting and you will find that you can make the phone even dimmer than this using the slider. The lowest auto setting is equivalent to level 3 on the manual scale - what the guys here want to do is make this equal to level 1, or lower (or in the case of one poster make the maximum auto setting equal to the maximum manual setting, or perhaps even higher if possible).
The issue is therefore not whether or not the light sensor works (it does), or whether the phone can automatically dim/brighten the display in response to the ambient light level (it can), but whether it is possible to make the full scale range in automatic mode equal to that which the device offers in manual mode.
Mathew
Spot on!
Hi friends.
I have the problem using TomTom at car. When Diamond receive direct sun light it increases backlight until 70%, but not 100%; when I drive at night Diamond decreases backlight until 30%.
I would like adjust some values to 100% and 10% but I have no idea about registry or dlls.
aidrabmol said:
When Diamond receive direct sun light it increases backlight until 70%, but not 100%; when I drive at night Diamond decreases backlight until 30%.
I would like adjust some values to 100% and 10% but I have no idea about registry or dlls.
Click to expand...
Click to collapse
Nice summary
This exactly was the original topic of this thread.
Scotchy49 said:
Ok, all this search was fun. But I told myself: what if I just go ahead and try if the already built-in app works ?
And yea, it already works. Meaning if you put the device in front of the sun, it will go bright, and dim if you're in a dark place.
So I guess this is a configuration specific issue and don't need a new app. I'm out of tha place !
P.S.: It would have been actually quite stupid to include a Light sensor but not using it.
Click to expand...
Click to collapse
Did you come any further with the app?
I too would like to see a solution for the narrow range of light sensor adjustment. The screen stays too bright when ambient is dark.
In my Sprint CDMA Diamond, I see these registry entries:
HKEY_CURRENT_USER\ControlPanel\BackLight
LSensorReduceBKLDelay
LSensorAvegQuene
I wonder what they do. There must be some way to change the range of adjustment or the bias of the light sensor.
050820121030:
I have use the search button to see how i can lower screen brightness on galaxy note.
i found everywhere mentioning screen filter, it is not i don't like screen filter, but when i take screenshot it will be tinted gray.
so i decide to go to a more elegant way like what atrix 4g user did.
http://forum.xda-developers.com/showthread.php?t=1245332
i tried with my note, i cant find sys/bus/i2c/drivers/lm3532, i decided to check folder with the nearest name, but i can't find it.
so i decided to download linux, mind you i have no idea how to use linux.
i downloaded samsung ics opensource update 4, inside i can't find leds-lm3532.c,leds-lm3532.h,board-mot-lights.c.
so futhur dig found leds-lm3530c, the file structure is different with leds-lm3532.c, but i think it works the same.
any good suggestion from experts?
edit1 050820121203:
I decided to check what AdjBrightness do.
it is modifying the following files
/sys/class/leds/lcd-backlight/brightness
/sys/class/leds/amber/blink
/sys/class/leds/amber/brightness
/sys/class/leds/green/blink
/sys/class/leds/green/brightness
all return errors in note.
further investigation leads to Rootdim:
/sys/class/leds/leds-sec/trigger
/sys/class/leds/leds-sec/brightness
/sys/class/leds/leds-sec/mmc1::/trigger
/sys/class/leds/leds-sec/mmc1::/brightness
/sys/class/leds/leds-sec/mmc2::/trigger
/sys/class/leds/leds-sec/mmc2::/brightness
here all the triggers return error.
next thing i check /sys/class/
i see backlight/panel in it.
i also see lcd, leds and lightsensor.
have no idea, keep digging.
100820120935:
Found s6*aa*.c files inside driver folder.
There will be some info about 5.3inch screen.
Deeper search found that it only suplort 24 stages of brightness
From 0,1 to 30 is 0
Conclusion minimum brightness for galaxy note is 1(more than 30)
Keep digging.
100820121808:
s3cfb_s6e39a0.c contain brightness level from 1 to 24.
100820121815:
AMS529HA01 is samsung 5.3 inch galaxy note panel
s3cfb_s6e8aa0 -- the one we are using.
the following files also related to the above file.
s3cfb_s6e39a0
s3cfb_s6e63m0
s6d6aa1
s6dr171
s6e8aa1
smart_dimming
midas-lcd
setup-fb-s5p
the whole thing means samsung have tried other lcd before hd super amoled 5.3 inch?
keep digging for the brightness
150820121820:
End of research, the brightness for amoled devices only have 24 levels.
lower than that you will need to adjust contrast for better battery consumption.
if you use filter it wont decrease battery consumption, and it will affect your screenshot images clarity.
1609120512:
https://sites.google.com/site/androidnothize/no-dock/input-device-and-backlight
this shows you minimum brightness level is 30
http://forum.xda-developers.com/showthread.php?t=1709686
search for min_bl
http://forum.xda-developers.com/showthread.php?t=1154278&page=617
curve?
http://forum.xda-developers.com/showthread.php?t=1576355&page=222
N.E.A.K
So, what's the verdict? Are we stuck with "too bright in the dark" screens on our Note's?
d210 said:
So, what's the verdict? Are we stuck with "too bright in the dark" screens on our Note's?
Click to expand...
Click to collapse
For that purpose a screen filter works just fine for me.
Frankly it's not doing it for me, it looks like I'm looking through a grey plastic bag.
Andrew0811 said:
150820121820:
End of research, the brightness for amoled devices only have 24 levels.
lower than that you will need to adjust contrast for better battery consumption.
if you use filter it wont decrease battery consumption, and it will affect your screenshot images clarity.
Click to expand...
Click to collapse
So what is conclusion bro?
We can't use brightness below the SYSTEM-MINIMUM?
I also want more battery by reducing brightness to below 10.
AND yes you did well.
Good research.
Hello,
I just purchased a Nexus 6 and am curious what options there may be to change the color saturation settings. I've already flashed CM12 and have been playing around with the Live Display settings, but they don't seem to help. I am able to change the color temperature and the RGB values, but the colors still appear to be overly saturated in my opinion. I'm interested in a way to adjust them so they are closer to the Professional Photo mode on Samsung's recent devices, or the iPhone. Is there a software tweak or ROM that would allow me to do this or is there a hardware limitation that would prevent this?
Thank you!
Solved
AvalancheRyder said:
Hello,
I just purchased a Nexus 6 and am curious what options there may be to change the color saturation settings. I've already flashed CM12 and have been playing around with the Live Display settings, but they don't seem to help. I am able to change the color temperature and the RGB values, but the colors still appear to be overly saturated in my opinion. I'm interested in a way to adjust them so they are closer to the Professional Photo mode on Samsung's recent devices, or the iPhone. Is there a software tweak or ROM that would allow me to do this or is there a hardware limitation that would prevent this?
Thank you!
Click to expand...
Click to collapse
Never mind, I found the answer! KCAL Color Calibration can do this.
If you want a story: by my assumptions, I have a sensitive vision (because apparently problem is too unpopular) - I prefer low light/darkness, and even on low brightness white point is already enough high for me, but dark colours are almost illegible. With some more brightness, whites become uncomfortable bright, while darks are still barely perceptible. I've faced that problem before - and it was perfectly cured with setting monitor gamma from 2.2 to ~1.2 (by color calibration on Windows and xgamma on Linux)! So I did some (desperate) research for Android, and... now I suppose that my best bet is KCal? Is there some stuff already or should I implement it myself? (And yes I've tried most of the obvious things.)
P.S.: I did that trick on PC five years ago - and I still can't believe I've been burning my eyes with that light projector for a decade and minded nothing but discomfort! I was so blind...
P.P.S.: Why this setting isn't there for user in the first place? I'm scratching my head. I mean, gamma is so undervalued! Even more, I've heard that it was possible to adjust gamma before Android 5 with a single root, but then Google decided to remove all the possibilities...
Any ideas?
Hmm... It's too quiet everytime when I ask this question. Anyway I've searched core codebase and didn't found any hardcoded gamma values. Most relevant founds were gamma_table (which I believe contains some gamme curve sequence) and color correction/LUT processing code (which is signed as mediatek+xiaomi work and dated 2019 iirc), but no input data or place where they actually used as I can tell. Maybe I just can't find/see something (it's my first such lookup ever lol and there's stateless C vs my OOP C# background), or maybe it's for these xiaomi hidden Advanced Display Settings with actual gamma slider (not working ofc, and maybe will never do), and maybe even OS itself uses it? Can't figure out with my little knowledge, but also can't belive there isn't any hardcoded gamma curve or something (assuming KCal is a core module so I think it uses core "values"), which will be enough for me. So I didn't gave up on this, but it looks like that even XDA community doesn't bothered by such lowkey problems and I must not expect any help whatsoever...
I still finding the way to adjust gamma on android too
Hello everyone,so yesterday i recieved my new S20FE from my service provider. At first glance it seems to be a decent device. Anyway,while setting up the phone,i found that the "white balance" controls under the display settings,dont appear to be changing any colour aspects of my screen at all. No matter how i adjust the Red,Green and Blue control sliders,the the screen remains exactly the same.
Am i doing something wrong,or have i missed something? When compared to my Sony Xperia XZ2 which also has white balance controls that actually work,i may add. The Samsungs screen appears very dull and the whites are more of a cream tone than actual white,which frustrates me. Has anyone else had issues with the colour adjustment on their S20FE and is there a way to get my whites from cream to actual white?
Any help or advice would be greatly appreciated.
@Trace.Oneil I have the 5G snapdragon version and tested Vivid screen mode today. it was so garish that had to try adjusting the RGB values underneath. that too made ZERO DIFFERENCE on my phone.
I quickly went back to natural.
PS, I can't remember much about it but I've heard there's a 3rd screen mode that's hidden and can be activated with ADB. maybe look that up.
How to Enable Hidden Screen Modes in Samsung Galaxy S20 (Natural, Vivid, Cinema, Photo and Basic) - Techtrickz
The Dynamic AMOLED display on Samsung Galaxy smartphones provides the best visual experience in any lighting condition. And on the latest Galaxy phones, there are two screen modes – Vivid and Natural – under the display settings menu to choose for the best visual experience. But, did you know...
techtrickz.com
3mel said:
How to Enable Hidden Screen Modes in Samsung Galaxy S20 (Natural, Vivid, Cinema, Photo and Basic) - Techtrickz
The Dynamic AMOLED display on Samsung Galaxy smartphones provides the best visual experience in any lighting condition. And on the latest Galaxy phones, there are two screen modes – Vivid and Natural – under the display settings menu to choose for the best visual experience. But, did you know...
techtrickz.com
Click to expand...
Click to collapse
Thanks,i actually found that online and gave it a try. Although there are some differences between the modes,the RGB sliders still dont work with any of them so you cant fine-tune your screen to your preferred colour settings which is a total waste. Why even include it in the software build if it does'nt work.
I was wondering if the other modes take too much power and that's why they were hidden.
maybe that could apply to the slider ?
3mel said:
I was wondering if the other modes take too much power and that's why they were hidden.
maybe that could apply to the slider ?
Click to expand...
Click to collapse
I doubt it would be a power issue. The mode to me that is the most intense with colour,is Vivid and that is not hidden. I think Samsung forgot about the RGB settings to be honest,and that is probably why they dont work.