Database Develop

Lightsensor, controlling backlight. Change to lower setting.

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.

How to Keep the brightness always minimum?

Despite doing this manually in the settings, occasionally the brightness goes up due to unknowns. Is there a way to keep the brightness always low?
Sent from my GT-I9000 using XDA App

are u sure u dont have the "automatically adjust" setting activated?

vinodis said:
Despite doing this manually in the settings, occasionally the brightness goes up due to unknowns. Is there a way to keep the brightness always low?
Sent from my GT-I9000 using XDA App
Click to expand...
Click to collapse
If you swipe along the notification bar at the top you can increase or decrease the screen brightness.

"it's a feature not a bug"
i hated it myself till i read somewhere that (only if you deactivate auto-brightness) you can increase/decrease the brightness by swiping left/right on your notification panel! it happens often by mistake when you pull it down ... thats your problem
in the new froyo rom's this is no longer the case so now i use auto-mode and wait will this "feature" is no more
edit: Intratech...too fast

jodue said:
"it's a feature not a bug"
i hated it myself till i read somewhere that (only if you deactivate auto-brightness) you can increase/decrease the brightness by swiping left/right on your notification panel! it happens often by mistake when you pull it down ... thats your problem
in the new froyo rom's this is no longer the case so now i use auto-mode and wait will this "feature" is no more
edit: Intratech...too fast
Click to expand...
Click to collapse
I never noticed this actually.. Also ensure though in the browser you have set brightness manually there

have the same problem, but i find the auto brigthness setting saves my battery more rather than accidentally turning it maximum brightness

I tried the "Dimmer" and "Brightness!" apps from the market. But none of them 'Keep' the brightness at the minimum always.

I've noticed 3 places where the brightness can be set - 1st being the web browser, 2nd the actual settings option, and 3rd the video player. Currently, I disabled the auto brightness control and I've set all 3 places to 1 step above minimum. Seems to work for me.
Also, I have a widget on the home screen to set/monitor the brightness level, it's called 'Brightness Widget by Stark Technology Inc.'.

vinodis said:
I tried the "Dimmer" and "Brightness!" apps from the market. But none of them 'Keep' the brightness at the minimum always.
Click to expand...
Click to collapse
its a bug in ddjf3 try a different rom. maybe jg5 or jm2.

[REGISTRY] Boost Battery Life!!!

Go to this key: [HKEY_LOCAL_MACHINE\Software\OEM\KeyState]
Then add this value: "application_btn_vibrate3"=dword:1
to add the value, go to settings in registry editor in the described directory and choose "new value"
valuename: application_btn_vibrate3
value data: 1
value type: Dword
This will disable the vibration for the three touch keys ( back,home,search) and increase the battery life significantly.... If u want the vibration back then just change the value to 0

known long ago....

Thanks for the info!! I did not know long time ago!!! I'll have to give it a try and see if it helps me out.

it definitely does....im testing this and a few other reg tweaks and seeing how long my battery will last...ill post the results with some screenshots soon

Thanks vor this tweak. I'm glad to get ride of this anoying vibration. If this saves measurable power that would be perfect
Sent from my HD7 T9292

Im using custom Intrinsic ROM now....will post the battery life pics in some time.....
Searching for other tweaks too

Using Intrinsic rom apply it. Switch off and on my Hd7 thought my understanding the 3 button deactivated but it still vibrate.
Edit: delete it and apply new ones(dword)string b4. And now it work.

i have this tweak applied in my custom evolution 7 rom
u will see a battery life increase in standby time

Thanks...will try...
Is there a reg tweak to make the automatic brightness levels range from
0-10.
The HD7 is considerably bright even in a pitch dark room. But if you change the brightness from Auto to Low. Its significantly low.
Can anyone please look into this. Thanks.

backlashsid said:
Thanks...will try...
Is there a reg tweak to make the automatic brightness levels range from
0-10.
The HD7 is considerably bright even in a pitch dark room. But if you change the brightness from Auto to Low. Its significantly low.
Can anyone please look into this. Thanks.
Click to expand...
Click to collapse
i guess the auto brightness doesn't work :/
Been searching for that tweak since so long.....even the SMS Led notification....so far no success.....i cant even find where the LED registry's are.....

sirajgoku said:
i guess the auto brightness doesn't work :/
Been searching for that tweak since so long.....even the SMS Led notification....so far no success.....i cant even find where the LED registry's are.....
Click to expand...
Click to collapse
well it sucks for the auto brightness to not work then..my old Hd2 with Windows Mobile 6.5 did a better job at it..there has to be a way !!

sirajgoku said:
i guess the auto brightness doesn't work :/
Been searching for that tweak since so long.....even the SMS Led notification....so far no success.....i cant even find where the LED registry's are.....
Click to expand...
Click to collapse
the HD7 auto brightness needs a complete overhaul. it does get brighter dynamically but does not lower down the same way.
the samsung omnia 7 auto brightness works correctly

Magpir said:
the HD7 auto brightness needs a complete overhaul. it does get brighter dynamically but does not lower down the same way.
the samsung omnia 7 auto brightness works correctly
Click to expand...
Click to collapse
PLEASE!!!! someone find a way....to make it work !! Its a big battery life killer !

backlashsid said:
PLEASE!!!! someone find a way....to make it work !! Its a big battery life killer !
Click to expand...
Click to collapse
basically the HD7 can up the brightness under direct sunlight. but when come into the shade , the brightness does not go down.
need to press and awake the phone for the sensor to adjust to the shade

Magpir said:
basically the HD7 can up the brightness under direct sunlight. but when come into the shade , the brightness does not go down.
need to press and awake the phone for the sensor to adjust to the shade
Click to expand...
Click to collapse
wait !! how is that ??
how can it up the brightness but not lower it down..
the hd7 was almost build on the same hardware as the hd2...and hd2 could do it..i know the OS was different...but still...i assume it works well on other phones !!! and how is it smart..if its not auto...

Yup that's the major defect!!
You can see the display when outdoors cuz the brightness automatically adjusts itself...but when u come back indoors the screen still remains bright....
I looked into the brightness registries and I didn't find anything to change to make it work properly :/
I guess that's it with brightness of hd7 :/

IF HD2 can do it , why not HD7 which is newer?
Maybe someone can find something in the registry to modify auto brightness to work like HD2 ?
---------- Post added at 07:41 AM ---------- Previous post was at 07:39 AM ----------
sirajgoku said:
Yup that's the major defect!!
You can see the display when outdoors cuz the brightness automatically adjusts itself...but when u come back indoors the screen still remains bright....
I looked into the brightness registries and I didn't find anything to change to make it work properly :/
I guess that's it with brightness of hd7 :/
Click to expand...
Click to collapse
yes, when it adjusts itself to the ourdoot brightness, it does it quite well too, like 2-3 step increment ( u can see the brightness going up 2 steps depending on the ambient sunlight). THis means the sensor is on and running all the time when u have the screen turned on
but go back to indoors, it doesnt adjust down.
still pondering how is that they make it this way? Does not make sense

Ya even was searching for the LED for the SMS notification....no success!!

Magpir said:
IF HD2 can do it , why not HD7 which is newer?
Maybe someone can find something in the registry to modify auto brightness to work like HD2 ?
---------- Post added at 07:41 AM ---------- Previous post was at 07:39 AM ----------
yes, when it adjusts itself to the ourdoot brightness, it does it quite well too, like 2-3 step increment ( u can see the brightness going up 2 steps depending on the ambient sunlight). THis means the sensor is on and running all the time when u have the screen turned on
but go back to indoors, it doesnt adjust down.
still pondering how is that they make it this way? Does not make sense
Click to expand...
Click to collapse
+1 !!!

sirajgoku said:
Go to this key: [HKEY_LOCAL_MACHINE\Software\OEM\KeyState]
Then add this value: "application_btn_vibrate3"=dword:1
to add the value, go to settings in registry editor in the described directory and choose "new value"
valuename: application_btn_vibrate3
value data: 1
value type: Dword
This will disable the vibration for the three touch keys ( back,home,search) and increase the battery life significantly.... If u want the vibration back then just change the value to 0
Click to expand...
Click to collapse
How can i access registry files of hd7

screen too bright

hello my s5 mini, when exposed to sun for example, automatically increases the screen brightness...altought so much bright that even the colors became strange. anyway, since i am rooted, to change the maximum brightness allowed in auto mode?

mclaudio said:
hello my s5 mini, when exposed to sun for example, automatically increases the screen brightness...altought so much bright that even the colors became strange. anyway, since i am rooted, to change the maximum brightness allowed in auto mode?
Click to expand...
Click to collapse
I've just read an article pointing out this weird thing:
http://www.androidcentral.com/samsung-galaxy-s5-mini-review
I've just tested this on my S5 mini, wow! I see what they mean by colours going psychedelic.
I don't think you have any control at all under Auto Brightness. You'd have to switch Auto Brightness off then slide the brightness to Max.

ShadowFlare said:
I've just read an article pointing out this weird thing:
http://www.androidcentral.com/samsung-galaxy-s5-mini-review
I've just tested this on my S5 mini, wow! I see what they mean by colours going psychedelic.
I don't think you have any control at all under Auto Brightness. You'd have to switch Auto Brightness off then slide the brightness to Max.
Click to expand...
Click to collapse
I absolutely know what you mean, same here...

maxpower_303 said:
I absolutely know what you mean, same here...
Click to expand...
Click to collapse
maybe some moding?

Maybe this is due to a feature named "Adjust Display". Go to Settings > Screen > Screen Mode. By default, it's set to Adjust Display, so the screen will automatically change its colors depending on ambient lightning.

[Q] Auto brightness doesn't work

Hi
The "Adapt to lighting conditions" is checked, but it doesn't really adapt. I have to manually change the slider to adjust brightness.
Looks like a bug. Not sure if there are any other settings to make.
Is this a known issue? Any workarounds?
Thanks.
Farhad.

The slider sets the maximum brightness of the screen, not the minimum. Hence, in order for the auto adjust to work, set it to the max and tick the check-box.

sxtester said:
The slider sets the maximum brightness of the screen, not the minimum. Hence, in order for the auto adjust to work, set it to the max and tick the check-box.
Click to expand...
Click to collapse
Source?

sxtester said:
The slider sets the maximum brightness of the screen, not the minimum. Hence, in order for the auto adjust to work, set it to the max and tick the check-box.
Click to expand...
Click to collapse
seems to work more like a brightness scale kind of thing. not only sets max, but minimum as well.
it'll always adjust when the box is ticked, but the slider determines how bright or dark biased it is.

It's a sliding window of brightness ranges, which should be good news to anyone who's felt that autobrightness on other phones swings too far in either direction. Now you can customize to your own taste.
Personally the sweet spot for me with good compromise between use in low light indoors, daylight and office lights is about 25% - the slider button just above the second "g" in "lighting conditions"
Remember though that changing White Balance settings will darken the display, and you'll need to boost brightness to get decent contrast again.

Use Lux Lite from the playstore. It lets you individually "link" a specific brightness level to a specific lighting condition, which the app then remembers and automates.

phositadc said:
Source?
Click to expand...
Click to collapse
What do you mean "Source"?
That's how it work[s|ed] on my Xperia U, Xperia M, Xperia SP and now on Xperia Z3C.
Not proof enough?

It works, but doesn't work well. When I wake up at night the brightness level goes lower but not nearly low enough. I have to manually reduce the brightness to the lowest level. When the day starts, I have to manually increase the brightness. Not ideal, not a deal breaker either. Hopefully Sony addresses in the next update.

garment69 said:
It works, but doesn't work well. When I wake up at night the brightness level goes lower but not nearly low enough. I have to manually reduce the brightness to the lowest level. When the day starts, I have to manually increase the brightness. Not ideal, not a deal breaker either. Hopefully Sony addresses in the next update.
Click to expand...
Click to collapse
Totally agree, Im using lux to improve the brightess auto adjust....