Fix adaptive brightness (all windows 8)

antys86 · Dec 15, 2013

I customized a luminosity curve for my surface rt, just edit the registry keys.
Download extract and run the attached .reg file and confirm the insertion of the Keys, then reboot the system.
Alert to make a backup of the old keys if you want to restore the previous state.
This change is compatible with all windows 8 but I have tested only on the surface.
Adaptive brightness varies proportionally to the user manual brightness, I suggest to manually adjust the brightness bar to about 20%, if you place the bar at 0 the brightness will be minimal with no automatic adaptation.
Appreciated thanks

New version v2
New improved version.
Try it and tell me if it's okay.
In the zip you will find the normal version and one with more brightness in the dark
I suggest to manually adjust the brightness bar to about 25%

antys86 · Dec 16, 2013

Someone asked me why I did this!
In my surface the luminosity curve does not satisfy me.
The display seemed to have only three levels of brightness, setting an average value (ie on the desk in the room in the morning) adaptivity did not fit values for low-light (night) and lots of light, that is to say the brightness in the dark was not a minimum making it annoying for the view and unnecessary consumption of battery, instead with shaded light levels brightness became easily maximum, with again a waste of battery.
This forced me to move often the brightness bar manually, but now with my calibration does not touch more because it adapts automatically to any light condition.
Also the adaptation of brightness occurred after 3 seconds by the change of light, whereas now changes instantly in 0,1 seconds (100ms).

ashwin1234 · Dec 17, 2013

Awesome, didn't know windows could be modded to do this! On a more related note, isn't the update interval a bit too high? 30x faster than normal seems a bit excessive and the battery drain would be very much more. If it is not too much trouble, could you perhaps make a version that updates every 1 second? This way people can download whichever one suits them best.

Thanks

antys86 · Dec 17, 2013

version 1sec

It is not the refresh rate of the sensor, but the time between changes in display brightness because of lighting conditions.
This parameter does not affect the battery consumption.
However, to keep you happy I attach the version by 1 second.
Tell me if the curve satisfy you in different light conditions.

ashwin1234 · Dec 17, 2013

Thank you, going to try it out now. What do you mean it is the time between changes of brightness? Shouldn't the brightness only change when the sensor detects it? Or is this a filtering via an average for the time period method?

Going to try out both of them to see the differences. Will report back here.

Back!: guess I understand what you are saying, the timing is just the gap between the different brightness levels, not the sensor reading. Sorry for the confusion caused.

I found the 1 sec one to not have a wide enough brightness range, but your original 0.1 sec one works perfectly. Using it now!

Thanks again!

antys86 · Dec 17, 2013

Yes, is the time to change between the different levels of brightness.
1 sec or 0.1 sec, the luminosity curve is the same.
Just for curiosity on what hardware you have tested?

ashwin1234 · Dec 18, 2013

I'm using it on a surface rt. But now I notice in the dark, I can't manually increase brightness anymore. I didn't backup my registry either, but its okay.

Edit: I can edit the brightness manually if I disable the auto brightness under settings

antys86 · Dec 18, 2013

more light night

My intent was never to touch the brightness bar!
In this version, setting the bar more than about 25%, I raised slightly the minimum brightness

KERKEDAGAIN · Dec 21, 2013

antys86 said:
Yes, is the time to change between the different levels of brightness.
1 sec or 0.1 sec, the luminosity curve is the same.
Just for curiosity on what hardware you have tested?

im using your original version on the Asus T100 and am loving it. Thanks!

antys86 · Dec 24, 2013

I'm happy for you. However, work in progress for a new version.

Nitro Lopez · Jan 7, 2014

does this work for laptops as well or just hand-help devices??

bountygiver · Jan 7, 2014

Nitro Lopez said:
does this work for laptops as well or just hand-help devices??

only if your laptop already has the adaptive brightness feature, check your display settings.

Nitro Lopez · Jan 7, 2014

bountygiver said:
only if your laptop already has the adaptive brightness feature, check your display settings.

it does.. thanks for the quick reply..:good:

antys86 · Jan 7, 2014

Nitro Lopez said:
does this work for laptops as well or just hand-help devices??

Works with all desktop, notebook, tablet in any version of windows 8. Obviously if you have a built-in light sensor recognized by windows

nalrodriguez · Jan 15, 2014

.Hey guys i been using this on the surfaxe pro 2 and i forgot to backup the defualt reg, i have no problems with it , i just wanted to compare wich i like the best, any chance any of you have the default reg backed uo.. thanks in advance

antys86 · Jan 15, 2014

nalrodriguez said:
.Hey guys i been using this on the surfaxe pro 2 and i forgot to backup the defualt reg, i have no problems with it , i just wanted to compare wich i like the best, any chance any of you have the default reg backed uo.. thanks in advance

On surface 1 just delete the ALRPoints key for the default curve value, on surface 2 I think is the same.

aaron.helin · Jan 26, 2014

nalrodriguez said:
.Hey guys i been using this on the surfaxe pro 2 and i forgot to backup the defualt reg, i have no problems with it , i just wanted to compare wich i like the best, any chance any of you have the default reg backed uo.. thanks in advance

Here you go

I made a backup before deploying it on my Surface 2 Pro..
Since I applied it just now, I will need to test it before giving comments on how good it works for me..

antys86 · Jan 27, 2014

aaron.helin said:
Here you go
I made a backup before deploying it on my Surface 2 Pro..
Since I applied it just now, I will need to test it before giving comments on how good it works for me..

Also doing the restore of your backup, you must delete the key "ALRpoints".
This is the right backup

aaron.helin · Jan 28, 2014

antys86 said:
Also doing the restore of your backup, you must delete the key "ALRpoints".
This is the right backup

ok, thanks for the finishing touch ?

XTCrefugee · Feb 9, 2014

antys86 said:
New version v2
New improved version.
Try it and tell me if it's okay.
In the zip you will find the normal version and one with more brightness in the dark
I suggest to manually adjust the brightness bar to about 25%

Thanks antys86, I'm using just your ALRPoints values (the morelightnight version) on my Dell Venue 8 Pro, and finally auto brightness is usable! Brightness needs to be set at 100% for me though.

Fix adaptive brightness (all windows 8)

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