Develop Bugs

Screen brigthness, negative value?

This is a two part question. What screen brightness do you usually leave your phone at? I leave mine on what seems to be 0 (see next paragraph for explanation) and my screen still always uses around 60-70% of my battery. I don't understand how it can use that much without the backlight on.
Next question - When adjusting the screen brightness and the slider is all the way to the left is that 0? I'm asking because every widget out there when set to 0 is a a few times brighter than when I manually move the slider all the way to the left. Also, after using a widget to toggle to 0 and I check in the display settings, the slider isn't all the way to the left.
So I'm wondering what is true 0? What the widgets set it to or with the slider all the way to the left? Could the slider being all the way to the left actually be hurting my battery life?

No zero on the slider is technically not zero. You can confirm this checking your brightness sysfs file. You have to decompile framework and adjust some numbers. We can take it down to true zero or slightly above which would be much dimmer.
I did this for the atrix. Im surprised it hasnt been done yet for the nexus.

I know it is not actually 0 because if it was I wouldn't be able to see anything on the screen.
Is there anyone that has insight on my questions though?

I dont understand your question. Zero is not true zero unless we mod the framework. So your backlight is not "off". I dont know why youre getting so much drain.
But we should mod this anyway. Use root explorer and go to sys/devices/omapdss/display0/a6e8aa0 and open the brightnesd file. Note that value with your slider at zero and you will see a reading of 30 (0-255). So we can lower that down to maybe 5-10 and zero on the slider will be much dimmer = battery saving.

I have a similar problem. The max brightness is piercing and the min brightness is just a tiny bit too dim.
I have tried used root explorer to change the maximum brightness from 255 to 100 hoping that the slider may be more granular after. For some reason however I cannot update the max brightness file. I have ensured that it is r/w mounted and tried changing the permissions too. It says that the changes have been made and the original backed up. When I reopen the file it hasn't changed.
BTW, my 'brightness' file is at 10 when placed at the minimum brightness.

Try the newest AOKP.
Brightness controls.
I actually have NEVER used auto brightness...even back in my OG days.
And my X days.
Even when custom auto-brightness options were around I ignored them.
I'd simply keep it at around %20 of the default lowest value.
BUT...this is slightly annoying when you step into the sun and can't see anything.
With the newest AOKP you can even set the amount of brightness changes.
I set up four values.
I've mine set up for a pitch black room to lowest.
Average room to my previous 20%ish.
Bright (sunny) to 100/255
SUPER sunny to 240/255.
I didn't notice any added drain today.
But this was my first test.
I think this feature was actually kanged from CM9, but I'm not certain.

So far I have resisted the temptation to get flash happy and I am on stock 4.0.2 but rooted. Do I have any options without changing ROM?

aidanbree said:
I have a similar problem. The max brightness is piercing and the min brightness is just a tiny bit too dim.
I have tried used root explorer to change the maximum brightness from 255 to 100 hoping that the slider may be more granular after. For some reason however I cannot update the max brightness file. I have ensured that it is r/w mounted and tried changing the permissions too. It says that the changes have been made and the original backed up. When I reopen the file it hasn't changed.
BTW, my 'brightness' file is at 10 when placed at the minimum brightness.
Click to expand...
Click to collapse
We cant change that brightness file with root explorer, even mounted, unless we mod the driver first. It will likely just revert right back to its previous value.
However it is possible i bet to edit the driver. Would be a cool project. You could also try to echo your desired value in terminal. ie echo 255 > brightness. But you prob will get the same result as using root explorer.
Maybe ill look at the driver with my limited skills heh. Or the alternative is to mod the framework which is def possible to fix this, and easier. We did exactly this on the atrix. And the sgs2 had it done too.
Edit: i think i found the code for your granular request. Check lines 30 or so.
https://github.com/ogdobber/android...0/include/linux/platform_data/panel-s6e8aa0.h
Still would be easier to do in framework instead.

Tweaked brightness settings - battery saving and readable (edit through CM settings)

I've come up with some great (I think so..) brightness settings for the Razr M. I worked on this to make sure of battery savings while remaining comfortably readable under any light conditions. So here they are if you are interested in having a go:
0 lux - 4% screen brightness
2 lux - 4%
3 lux - 6%
7 lux - 8%
22 lux - 10%
63 lux - 14%
180 lux - 22%
511 lux - 31%
1447 lux - 43%
4095 lux - 57%
11585 lux - 74%
32768 to infinity - 95%
You have to edit them in manually through CM settings, attached is the smooth graph of the outcome (from CM itself):
One thing that has annoyed me on any phone I've had is the auto brightness settings, so I did a bit a research into how the human eye perceives light increase, and its based roughly on log(lux), increasing screen brightness by ^2.5 each step. Result is that I wrote an excel sheet (also attached) with some cool maths where you can adjust some variables to tailor an auto-brightness curve to your taste.
I made a few assumptions specific to the Razr M for the above settings:
- It has a minimum light reading of 2 lux even in the darkest of darks (my defy did the same thing - might be a motorola thing)
- The lux reading is approximately accurate (my galaxy note 8 and Razr M give VERY similar readings under the same light sources)
- I topped the lux reading out at 32k (it does read up to 65k) because its around the starting value of direct sunlight, and it also happens to be a nice round number
Just thought I'd share because I think I nailed the auto brightness settings on this device.
Cheers

How did you get that many step points? I only see 0, 15, 100, 3000 and 8000-infinity.
I am running CM11.2 (4.4.3).
---------- Post added at 10:26 AM ---------- Previous post was at 10:14 AM ----------
Nevermind. Found it by long pressing a segment and choosing "split". Not real intuitive but it works.

Yeah you have to add in a few extra points with my setup. You could probably skip say every second point and it would work almost as well. But the built in brightness points ramped up to quickly for my liking - far brighter then necessary.

Where exactly do you go to in CM to modify these settings? I can't find them...

Display&Lights -- Brightness -- click on the settings icon next to the slider

I didn't mention in the first post, but the excel sheet is very customisable...
If you want to lower brightness there are several ways:
1. lower the maximum brightness
2. Increase the curve value (this affects the middle range of the curve mostly)
3. Increase the maximum lux value
Or if you want to increase brightness, just do the opposite of the points above. You know you have good settings when it looks the same always (ie doesn't suddently appear dim or bright). I think my default value are pretty close. I spent some time fine tuning, but like anything, there is always room for improvement
I also did this calculator so I didn't have to run another app in the background to control auto brightness.. save on a few MB of ram anyway.

Rufus said:
I didn't mention in the first post, but the excel sheet is very customisable...
If you want to lower brightness there are several ways:
1. lower the maximum brightness
2. Increase the curve value (this affects the middle range of the curve mostly)
3. Increase the maximum lux value
Or if you want to increase brightness, just do the opposite of the points above. You know you have good settings when it looks the same always (ie doesn't suddently appear dim or bright). I think my default value are pretty close. I spent some time fine tuning, but like anything, there is always room for improvement
I also did this calculator so I didn't have to run another app in the background to control auto brightness.. save on a few MB of ram anyway.
Click to expand...
Click to collapse
hello can u tell me more about the curve value? which range can be set? and whats the behave on mobile?

Brightness: no change from 0 - 12%

Note 8.0 N5110 (WiFi), CyanogenMod 13. I've never used the stock firmware.
There is no gradual change of the screen brightnees on my device from 0 - 12%, the brightness remains the same when i move the slider until 12%.
Then after moving the slider to about 13% the brightness "jumps" to that value at once.
This is the same when using the system brightness slider (that does not show the percentage) and the apps: Display Brightness & ScreenDim (both with a percentage slider).
Does anybody else have a similar issue under CM13 (or CM12/11, or the stock firmware)?
How could i solve this?

nicky-xda said:
Note 8.0 WiFi, CyanogenMod 13. I've never used the stock firmware. There is no gradual change of the screen brightnees on my device from 0 - 12%, the brightness remains the same when i move the slider until 12%. Then after moving the slider to about 13% the brightness "jumps" to that value at once. This is the same when using the system brightness slider (that does not show the percentage) and the apps: Display Brightness & ScreenDim (both with a percentage slider). Does anybody else have a similar issue under CM13 (or CM12/11, or the stock fiemware)? How could i solve this?
Click to expand...
Click to collapse
when you say "note 8.0 wifi" do you mean n5110? It's probably not something that can be fixed by a user.

Yes, N5110.
Sure, i can imagine that it'd be not easy to fix by a user. But i'm still very much interested to at least know...
- if it's a hardware "feature" of my device/display only, independant of the installed ROM or
- a generall bug of CM13 on the note 8 or a bug of CM13 on my device only or
- a quite different thing that could cause that?
That's why my question again: does anybody of you guys here experience a similar issue under any ROM having no change of the display brightness when moving the slider between 0 - 12%?

nicky-xda said:
Yes, N5110.
Sure, i can imagine that it'd be not easy to fix by a user. But i'm still very much interested to at least know...
- if it's a hardware "feature" of my device/display only, independant of the installed ROM or
- a generall bug of CM13 on the note 8 or a bug of CM13 on my device only or
- a quite different thing that could cause that?
That's why my question again: does anybody of you guys here experience a similar issue under any ROM having no change of the display brightness when moving the slider between 0 - 12%?
Click to expand...
Click to collapse
Using latest RR 5.7.4 my n5110 acts as yours, nothing happens until around 12%. I don't really think it's a problem, just the zero value on the slider is incorrectly set.
I made a build of RR tonight with a tentative change to hopefully fix this, but it made no change.
This change from S4 gives a clue that it's panel doesn't go below a certain value http://review.cyanogenmod.org/#/c/158859/ so I tried adding this.
I've always found the brightness slider to be weird on note 8 (compared to my S4)., but my problem was more the non-linearity of the slider. I only have experience of stock (4.2/4.4) and CM13 myself, so would be interested in how LL based roms sliders function.

Thanks a lot, i'm "glad" to know this is not only my device with this weird acting
...just the zero value on the slider is incorrectly set...
Click to expand...
Click to collapse
Sure, probably something of that kind.
But what's strange is the following: the above mentioned (btw: excellent) App "Display Brightness 5.1" is able to "dim" the brightness below the value of "0" setting a color layer over the screen.
This app begins to put its "below-0-layer" exactly at the value of 0 on its percentage slider and not at 12%. So it seems that this app actually takes the system-brightness of 0% as the "real" 0 and not the value of 12%. And the app is not able to change the brightness between 0 - 12% either.

Edit or adjust screen brightness

Hi,
I always dim my screen 15-20% lower then the automatic mode do. Can i set it permanently lower between the lux-variables which are linked to 0-80% screen brightness?
Is this understandable?
For example: 20% screen brightness is set to 140lux
50% to 250lux.
I want to increase the lux or reduce the %.
It was so simple on my old Nexus 5 with Cyanogenmod ;D
Is there a xposed module or a app to edit the settings?
I dont want a app-icon in statusbar or a widget.
Thanks

Spillunke said:
Hi,
I always dim my screen 15-20% lower then the automatic mode do. Can i set it permanently lower between the lux-variables which are linked to 0-80% screen brightness?
Is this understandable?
For example: 20% screen brightness is set to 140lux
50% to 250lux.
I want to increase the lux or reduce the %.
It was so simple on my old Nexus 5 with Cyanogenmod ;D
Is there a xposed module or a app to edit the settings?
I dont want a app-icon in statusbar or a widget.
Thanks
Click to expand...
Click to collapse
Lux Auto Brightness app can do that but it's paid (not necessarily)

But with Lux i always have a ugly symbol in statusbar and it doesnt work like i want it to work.
What settings i should make in Lux?

GravityBox Xposed Module

[ROOT] Brightness mod for Treble 9.0 (version 2)

Hi everyone!
As you may know, the brightness on the phh-treble (the 9.0 version) is really bright even at the minimum value.
So I have created a small app that contains a quick settings tile, and with that you can set the brightness to a lower value.
Supported brightness values:
60, 100, 200 (system minimum is 345)
The program requires root access to run the commands on the sysfs, so when you put it on the quick settings place, a su window will appear, where you can grant (or deny ) access.
The program is provided AS IS, and please be aware that I am not responsible for any damage caused to you or to your device.
Changelog:
version 2
- 3 different brightness values, always starting from the maximum if the brightness is above 200
version 1
- Initial release

Thank you so much!
Brightness is an issue on treble roms, thanks for the fix bro

Version 2 released, see changelog in the first post!