Develop Bugs

[Q] Bug in Auto-Brightness?

I hope someone can confirm if this is a bug or not!
Whenever I turn off my screen, and then on again it takes a second for the screen to auto-adjust the brightness up or down. (depending on the light-situation!)
Isn't the light sensor supposed to know what brightness to be at even when the screen is shut off? It's as if it first detects the light-situation when I turn on the screen. Could someone please try (in either a very dark or light room) try shut off screen, then back on and check if the brightness has stayed the same or if it first adjusts it when you've turned it on?

Why would it monitor the light when the display is off? Seems like a waste of power to me.
I doubt its a bug. More like a powersaving feature.

That's normal AFAIK.
The light sensor turns of when the screen goes off, to save a few milliamps I presume.

To my knowledge this is normal, its how mine operates as well.
Sent from my Desire HD using XDA App

It's like that on mine too. I think that all sensors are turned off when the screen is off to save battery.

[SOLVED] Bug in Auto-Brightness?
Alright, thanks for the replies. Just didn't notice it till now and it sort of bothered me.

Two weird things I have noticed

Screen Brightness: I have set the screen brightness to medium and and timeout to 60 seconds. I have started to notice that it will change the settings on its own. I will notice the screen is dim then look at the brightness setting and it will be set to minimum. Another thing that is driving me crazy is that it will dim the screen if you don't touch it regardless of the screen time out.
I have also noticed that sometimes when typing the screen does not follow were the words are going.
Other than these two minor pet peeves I absolutely love this phone. If it had a vag it may replace my wife.

The screen dimming is probably done by u. If u run your hand back and forth at the bottom of the notification bar it will change your brightness. Auto brightness has to be off. Its a cool feature that the original epic had.
Sent from my SPH-D710 using xda premium

u might want to disable the "power saving mode"... i had the same issue as u, but it seems to be fine since i disabled power saving mode

That's the thing I have my settings to auto brightness off
Edit: I will try turning the power saving mode off

Did not know that about the notification bar dimming the screen that's a cool feature.
musclehead84 said:
The screen dimming is probably done by u. If u run your hand back and forth at the bottom of the notification bar it will change your brightness. Auto brightness has to be off. Its a cool feature that the original epic had.
Sent from my SPH-D710 using xda premium
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Sent from my SPH-D710 using XDA App

Thanks I bet the notification bar might be it. That is awesome, I can't believe I didn't know that yet.

IF your in the internet browser that came with the phone and you turn up your brightness all the way and then you notice while your look at page all of a sudden your brightness will go back down to like 10% I found out the culprit.
the browser has a BROWSER BRIGHTNESS option in the menu. you can turn auto on or theres another slider there and it appears factory setting is all the way left or lowest.
this was pissing me off today while I was waking in the sun, I thought I had my brightness on all the way but with in 5 seconds while look here on XDA, the brightness kept going back down on its own and I do not have auto on. the thing I was doing to get it back up bright again was to do the notification swipe to the right and that would only temporary fix it.

Touch keys NEVER turn off (even when the phone is off)

My touch keys (soft keys) never turn off. Even when the phone is off. When the screen is on they work as they should, meaning that they do turn off completely after not touching the screen for a while, but as soon as the screen turns off, the buttons turn on, and not full brightness but dim. This happened when i started deleting bloatware, but i have already installed different roms and same problem happens. What can i do? Are there any drivers that i should check for the backlight of these buttons?? PLEASE HELP!!!!!

Do you have a text message everytime you see em light up? You might have BLN on... What kernel u running?
Sent From my Galaxy S II T-Mobile

Thats what i was hoping for, but my noticifications are clean. I even went back to stock ROM and its still the same. the kernel im running is 2.6.35.11

Post in general not here
Sent from my SGH-T989 using xda premium

Sorry about that. I already did, but since the developers are always hanging around here i thought i would get luckier.

asainz320 said:
Sorry about that. I already did, but since the developers are always hanging around here i thought i would get luckier.
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Check your display settings. There are options for the soft button lights including "always on."

Even when i put the setting for always off, they would stay off when im working on the phone, but i soon as i turn of the screen the touch keys come on and stay on in a very low dim.

is there any piece of code i can flash to force the touch keys to turn off?

This is for development only.not Q&A or any general.mod please move
From a glaxay better than yours.

Has anyone figured this out? Same thing is happening to me and it's annoying.

It's probably your imagination. The brightness from the screen cancels out light (the light that actually is reflecting off the buttons, not coming from the buttons) coming from the buttons when they are "off" as you use the screen and instantly or slowly come into vision as you turn the screen off. When you turn the screen off, there is no light to cancel out the light (sun's rays) coming from the buttons and you can see them. To test, go into a room with no light at all and turn the phone off. If the dim light from buttons are no longer visible, then it was just your imagination.

You dug this out the grave

Me? I just tought I'd put my thoughts and observations out there and help the guy. I didn't dig up any thread if you are talking to me.

aranurea said:
It's probably your imagination. The brightness from the screen cancels out light (the light that actually is reflecting off the buttons, not coming from the buttons) coming from the buttons when they are "off" as you use the screen and instantly or slowly come into vision as you turn the screen off. When you turn the screen off, there is no light to cancel out the light (sun's rays) coming from the buttons and you can see them. To test, go into a room with no light at all and turn the phone off. If the dim light from buttons are no longer visible, then it was just your imagination.
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Thats how i knew the lights were staying on, cus when i went to sleep i noticed the lights were still on. This is not visible if there's other light sources around you because the buttons light up very dim. You only notice in a completely dark room.

Did you change your settings? If that didnt work, try taking it to a tmo store.
Sent from my SGH-T989 using XDA

asainz320 said:
Thats how i knew the lights were staying on, cus when i went to sleep i noticed the lights were still on. This is not visible if there's other light sources around you because the buttons light up very dim. You only notice in a completely dark room.
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It's supposed to be like that.

asainz320 said:
My touch keys (soft keys) never turn off. Even when the phone is off. When the screen is on they work as they should, meaning that they do turn off completely after not touching the screen for a while, but as soon as the screen turns off, the buttons turn on, and not full brightness but dim. This happened when i started deleting bloatware, but i have already installed different roms and same problem happens. What can i do? Are there any drivers that i should check for the backlight of these buttons?? PLEASE HELP!!!!!
Click to expand...
Click to collapse
Warranty swap
Sent from my SGH-T989 using xda premium

Does your 'Auto Brightness' work perfectly?

Auto Brightness is meant to work in a way that when an external light source is there the screen will go bright and with the source gone it will be normal. I was just testing mine with my backup phone's (a cheap Samsung, which has a LED torch) torch and each time I put it near the Note 2's sensor (about 6" distance) the screen goes up very bright, that's okay, but the problem is when I turn off the torch the brightness stays the same, i.e very high, it won't go back to normal unless I press the Power button to turn the screen off and re-press it to awake the phone. But it kinda works when I am browsing net on it having my room light on, and then it goes back to normal, or dims out when I turn off the light. But the issue is occurring when I am placing the torch near it's sensor.
Have any one of you tested it. Is it normal?
TIA.

jujuburi said:
Auto Brightness is meant to work in a way that when an external light source is there the screen will go bright and with the source gone it will be normal. I was just testing mine with my backup phone's (a cheap Samsung, which has a LED torch) torch and each time I put it near the Note 2's sensor (about 6" distance) the screen goes up very bright, that's okay, but the problem is when I turn off the torch the brightness stays the same, i.e very high, it won't go back to normal unless I press the Power button to turn the screen off and re-press it to awake the phone. But it kinda works when I am browsing net on it having my room light on, and then it goes back to normal, or dims out when I turn off the light. But the issue is occurring when I am placing the torch near it's sensor.
Have any one of you tested it. Is it normal?
TIA.
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I have the same issue especially after the new update I don't know is this a problem in sensor or software?

AW: Does your 'Auto Brightness' work perfectly?
I just tested it while reading this and my screen dimmed immediately after turning off the light.
Android 4.1.2 (DMB2)
Edit: You can see the current measurement of your light sensor by dialing *#0*# and choosing sensor.
Sent from my GT-N7100 using xda app-developers app

My autobrightness
My autobrigtness is slow to adapt, in some cases, when i go out on direct sunlight i have to wait almos 10 or 15 secs to become brighter.
I think that with older firmwares was faster...

Anyone observed, even with auto brightness mode, when you move the brightness bar from low to high the brightness increases a bit.
So, if I have the brightness in Auto mode and put the marker in high end, does it mean the brightness will be set with a value greater than normal-auto brightness for all lighting conditions?

ysrini said:
So, if I have the brightness in Auto mode and put the marker in high end, does it mean the brightness will be set with a value greater than normal-auto brightness for all lighting conditions?
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Exactly.

Love the marker to be honest. Something that annoyed me about my Nexus 7. Sure, there might be third party apps to set that, but so awesome to have it out of the box.

My auto brightness doesn't work perfectly, but I still give it an A for working correctly about 90% of the time. It is also the best device compared to many others I've had where auto brightness was basically a joke, even nexus devices.
Sent from my GT-N7100

Works good for me most of the time, just did what you did and after around 5 seconds the screen dims itself again. Bare in mind in a brightish room it can be difficult to see the screen change its brightness as it does it rather slowly. However I tend to turn auto brightness of as it's never quite how I like it (I like 100% brightness in a well let room, on auto it seems to only go to max 80%, and 100% only when outside). With the Note's ridiculous battery life I don't find it a big deal, I am still able to mock iPhone 5 users when they are turning brightness all the way down and mobile data off etc when it gets toward the evening

Same pronlem here
Sent from my GT-N7100 using xda premium

Mine dims again when I lay it down on ie table or holding phone in that position (like it was laying on flat surface). When I'm holding phone in any other position it won't dim.
Tested on 2 n7100's both running stock dmb6.
Wysyłane z mojego GT-N7100 za pomocą Tapatalk 2

re_mo said:
Mine dims again when I lay it down on ie table or holding phone in that position (like it was laying on flat surface). When I'm holding phone in any other position it won't dim.
Tested on 2 n7100's both running stock dmb6.
Wysyłane z mojego GT-N7100 za pomocą Tapatalk 2
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I have the same issue exactly the sensor works perfect when the phone is in horizontal position if I tilt it or hold it in vertical position it doesn't dim unless I closed the screen and opened it again I don't know the solution for this weird problem?

That's so that you don't accidently change the brightness. We tend to keep hands near the area the sensor is.
Sent from my GT-N7100 using xda premium

Screen dimming problems

Is anyone having dimming problems with there screen? For instance, when I'm on the browser, and want to swipe the screen upward with my finger the screen dims out right when I slide my finger without even messing with the brightness slider. It happens even on FB. The only way to bring up the brightness back is to turn off screen with the power button and back up or move the slider on drop down.
Anyone having this similar problem? Thanks.
Sent from my SM-N900T using XDA Free mobile app

I have issues where the screen doesn't adjust based on ambient light.
I am assuming you dont have auto-brightness turned on, do you have the same issue when it is on?

I haven't tried that. Bit its the screen that dims down by itself when I touch the screen. I did a factory reset when I was NF4 and update to NF9 and the problem is still there.
Sent from my SM-N900T using XDA Free mobile app

I don't know if this is the same as yours, but few times, when screen is close to it's time out, it dims to tell me so, now if I want to keep screen on I would swipe or touch it, most of the time it will go back to normal, but in very few cases, count down timer will reset, so the screen stays on, but the brightness doesn't come back, screen will stay at low power and I need to double click power button, to turn the screen off and on to get back proper brightness. It's very rare, haven't seen it since my update to NF9 week ago, but I've seen it. No big deal since it's rare and easily fixed with double click. If your problem is not time out related, then I have not seen it. Either way I would speculate it is software related, somehow screen brightness register is improperly or not updated at all. It doesn't bother me at all, but if it was I would probably try factory reset after full backup.