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Questions tagged [backlight]

A backlight is a form of illumination used in liquid crystal displays (LCDs) used in mobile, calculators and TV sscreens.

A backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light by themselves (unlike for example Cathode ray tube (CRT) displays), they need illumination (ambient light or a special light source) to produce a visible image.

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How to get current BackLight setting in Blackberry?

when my blackberry App starts, it wants to get the current Backlight timeout value which setted by user, for example, 30 seconds, 1 minutes. I've found the Backlight class in API documents. But it only has getTimeoutDefault() method, which will…
user1618533
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How to programatically detect backlight is on in iOS?

I want iOS code that can show if the screen is lit or not, so that my app can monitor battery power drain due to the (power hungry) backlight activity. This code must use the public API only, as I intend to submit the app to the App Store…
boultoa
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Changing backlight brightness in Appwidget is not responding instantly

I have created a simple Appwidget to control the brightness of the screen by this code: android.provider.Settings.System.putInt(context.getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, 50); When i click…
Santhosh_pulliman
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Change keyboard backlight with a keyboard shortcut on MacBook Pro using Automator, Shortcuts, or AppleScript

Apple has decided to remove keyboard backlight control keys from the keyboard on the new 2021 M1 MacBook Pros. I would like to reassign the keyboard backlight down/up functions to e.g. function keys F3 and F4. I am unable to find a Terminal command…
Nuka Kola
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Linux kernel Intel video driver (i915) backlight brightness difference between releases

I noted that the actual brightness of my laptop monitor is different on the same value(s) for backlight from the same range of available values when running Linux with kernel 5.4 vs. 3.13 (i915 driver). What might have changed to result in that? I…
Martian2020
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Android screen brightness (setBrightness) not instant, instead fades/drifts to set value

I'm using a component in Android 10 and 11, on the Pixel 4a, that is setting the screen brightness thusly: WindowManager.LayoutParams lp = window.getAttributes(); lp.screenBrightness = FREObjectUtils.getDouble( args[0] ).floatValue(); …
Joseph Diefenbach
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Why doesn't inotifywait notice the change in /sys/class/backlight/intel_backlight/brightness (Linux)

My laptop has a 4K OLED screen, so it has no backlight to change the brightness of the screen. To control the brightness, you need to use xrandr with the --brightness parameter. I have successfully done this in the i3 window manager before but I…
scippie
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change backlight brightness in linux with python

I'm working on a python project which should be able to control my backlight brightness. I working with Ubuntu 17.04 and I already locate where the file is that show my backlight brightness /sys/class/backlight/acpi_video0/brightness the command…
user8092846
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How turn On/Off android display backlight using C# only in Unity3d

Anybody knows how to turn On/Off android display backlight using C# only in Unity? I don't like plugins, and I don't want to make one of my own. I know that you can disable the display while using the proximity sensor... but i don't know how to do…
MadMac
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Reduce "BACKLIGHT" brightness in windows Embedded standard 7 using vc++

Is it possible to reduce the "Backlight brightness" in Windows Embedded standard 7, Monitor:Samsung DE40A programmatically with vc++ ? It is possible to reduce monitor backlight brightness with the monitor's remote. I have been able to reduce…
Shruthi
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Manipulation of the backlight in a embedded linux device is unstable

I want to control the backlight value of a LCD monitor in a embedded linux device. Doing researches throughout the internet I found a couple of references saying that the file called backlight inside the backlight's driver folder in sys/classes…
Momergil
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API for Asus 1005pe control backlight programmably?

I'm using VS2008, my OS is Win7. I tried WinAPI IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS on my netbook. I can retrive a correct the LCD handle, but DeviceIoControl returns 0. I haven't found any APIs for GMA 3150 either.
Ivan
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Video Driver for the crespo kernel

I am looking under drivers/video/samsung and I wish to make a custom driver that will specifically handle the screen back light brightness. So far reading the files s3cfb_nt35580.c and s3cfb_tl2796.c has shown me how the functions like …
Ducktales
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Restore Backlight To Previous Level, iPhone

I was working on my app recently and wanted to change the brightness of the backlight. I then wanted to restore the backlight level to it's original setting on exiting the app. Here is the code: #include "GraphicsServices.h" - (void)…
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Changing Backlight Level, iPhone

I searched around for a way to set the backlight level within an app on the iPhone. I found a solution here: http://www.iphonedevsdk.com/forum/29097-post3.html The problem I have is, when I add this to my app I get an error and a warning. My code is…
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