the lcd touch screen brightness cannot adjustment in stock

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When you update the Bios version to 1.5.0 on your Dell XPS 15 7590 system, you may not be able to adjust the LCD brightness. Open the Device Manager, you would find that multiple entries under the Monitors(See Figure.1). At that time, you can not increase or decrease the brightness in the following ways:

Try to adjust the brightness from the Display Settings/Windows Mobility Center(See Figure.2). The value can adjust but the display is stuck at a certain brightness, there is no effect if you adjust it to 0 or 100.

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NOTE: This causes your computer to restart as it flashes your BIOS with the Update. Please ensure you have the computer connected to a reliable power source during this.

Select the Networkicon on the right side of the taskbar, and then move the Brightnessslider to adjust the brightness. (If the slider isn"t there, see the Notes section below.)

Some PCs can let Windows automatically adjust screen brightness based on the current lighting conditions. To find out if your PC supports this, select  Settings >System>Display. Select Brightness, look for theChange brightness automatically when lighting changes check box, and then select it to use this feature. This automatic setting helps make sure your screen is readable wherever you go. Even if you use it, you can still move theBrightness slider to fine-tune the brightness level for a built-in display.

You might also see another check box displayed: Help improve battery by optimizing the content shown and brightness. Some Windows PCs can automatically adjust the screen brightness and contrast based on content that’s displayed on your built-in screen. For more info, see Adaptive brightness and contrast in Windows.

You might not see the Brightness slider on desktop PCs that have an external monitor. To change the brightness on an external monitor, use the buttons on it.

If you don"t have a desktop PC and the slider doesn"t appear or work, try updating the display driver. Select Search on the taskbar, type Device Manager, and then select Device Manager from the list of results. In Device Manager, select Display adapters, then select the display adapter. Press and hold (or right-click) the display adapter name, then select Update driver and follow the instructions.

I have spoken to Apple on Live Chat, they have taken control of my screen, tried resetting SMC, NVRAM, rebooting in safe mode, making me uninstall third party apps and are now suggesting to create a partition on the disk to reinstall the OS to see if my user profile is causing the issue.

I declined in doing that because 1) they said it would be a lengthy process, 2) I don"t have space on my SSD due to having bootcamp installed, 3) I have seen other posts on forums saying a clean OS install didn"t solve the issue.

This article was co-authored by wikiHow staff writer, Kyle Smith. Kyle Smith is a wikiHow Technology Writer, learning and sharing information about the latest technology. He has presented his research at multiple engineering conferences and is the writer and editor of hundreds of online electronics repair guides. Kyle received a BS in Industrial Engineering from Cal Poly, San Luis Obispo.

If you are having trouble adjusting the brightness or contrast of your laptop display, realize that every model of laptop (and every operating system) is a little different. Common ways to adjust the brightness and contrast on a laptop computer are provided below.

On most laptops, you can adjust the brightness of the display using special keys on the keyboard. The keys are usually marked with the brightness symbol (

The Fn key is usually located to the left of the spacebar. The brightness function keys may be located at the top of your keyboard, or on your arrow keys.

Other laptops have keys dedicated entirely to brightness control. On the HP Chromebook keyboard (pictured below), there is no Fn — press the brightness keys.

To change the brightness on a Chromebook, you"ll need to push one of the two adjustment keys. The small gear lowers the brightness, and the large gear raises it. They are located at the top of the keyboard, as you can see in the red rectangle below.

Use the brightness slider to adjust brightness. If you want your brightness to change automatically based on the ambient light near your computer, check the box marked Automatically adjust brightness.

There are command line tools to adjust the contrast of your screen such as xgamma and xcalib. These can fine-tune any reductions in your screen"s default contrast level.

To increase contrast above defaults, most window managers offer a high-contrast theme to make your screen easier to see. In Gnome-based window managers, such as Ubuntu Unity, follow these steps:

After adjusting your laptop"s brightness, it should retain the new settings automatically. If the brightness settings are not retained after a computer restart, they are probably being overridden by settings in the Power Options menu. If this is the case, you"ll need to create a custom power plan, which can be done by accessing the Power Options utility in the Control Panel.

If the key combination method is not working and you"ve made the appropriate adjustments in Power Options, it is likely your computer has a video driver problem. Driver issues usually occur after updating the video drivers. Monitor drivers can also cause this problem. To resolve any potential monitor related issues, reinstall the monitor by following the steps below.

Once the monitors are removed from Device Manager, under Action, click Scan for Hardware changes to let Windows re-detect the monitor and install the applicable drivers.

Finally, we also recommend downloading the latest video drivers directly from the video card manufacturer. If this problem was caused because you updated the drivers, install an earlier version of the video drivers to see if that resolves the issue.

If, after following the steps above your brightness is still not enough, plug your laptop into the wall. If the laptop is plugged in but still is not bright enough, try the suggestions on the page linked below.

If this setting does not appear, we recommend contacting Microsoft Support or your system manufacturer for information on how to disable the Adaptive Brightness. Adaptive Brightness is a setting provided by Windows that uses an ambient light sensor in the system to automatically adjust a display"s brightness to the surroundings.

Go tothe Microsoft Store. If you are unable to access the Microsoft Store because you are using a business PC, contact your IT or network administrator.

1. Download the latest utility program corresponding to your LCD Monitor model from ASUS Download Center, enter the model,and click on Driver & Tools.

Security notice: The application will be started with root privileges. If you use your pi only for playing around, this should be no problem. Otherwise you should figure out if this is a problem for you.

There are different ways to adjust the screen brightness in Windows 10 and 11. You can either adjust the brightness yourself in the operating system, have the brightness adjusted automatically, or change the brightness directly on the external screen.

Find and click on the “Display” tab (or “Screen” in some cases). In the right-hand panel, you will see a slider that lets you freely adjust the screen brightness. There’s also an option to turn on Night light. You can turn on night mode immediately (without specifying a time of day) by left-clicking on “Night light settings”. Adjust the strength of the night light or alternatively, simply move the slider to “On”.

To open the System settings without going to the main Windows settings screen, right-click in any empty space on your desktop and select “Display settings” in the menu that opens.

The screen brightness can be adjusted with a shortcut so you avoid having to take a detour by navigating around lots of menus. Many keyboards have two F keys with a sun symbol in the top row. The “Adjust brightness” function is assigned to these keys as a secondary function. To execute this, press the [Fn] + [lighter/darker] keys simultaneously. Repeat this brightness control process until the desired brightness is set.

The Action Center is a quick way of accessing various settings, including the screen brightness settings. Windows 10 and Windows 11 both have these options, although the terms they use are slightly different.

To open the Action Center, left-click on the speech bubble icon at the bottom right of the taskbar in Windows 10. As a Windows 11 user, you will find the option after clicking on the network icon — also at the bottom right of the taskbar.

If there is no brightness control slider in the Action Center box, look for a tile labeled “Brighter” or the sun symbol. Keep clicking on the tile with the left mouse button until the screen is bright enough for your needs.

On computers with external monitors, the brightness is usually adjusted directly on the monitor instead of the operating system. Using the physical buttons on your monitor, you can call up the on-screen display, which allows you to adjust the brightness. The exact position of the buttons and the structure of the on-screen menus depends on the device and manufacturer, but there are usually small symbols on or above the corresponding buttons to guide you. If you’re in any doubt, refer to the user manual for your monitor to find out how to change the screen brightness.

Some computer models have an integrated light sensor, which enables the screen brightness to adjust automatically to changing light conditions. It can also be found in the system settings.

The night mode in Windows also offers automatic adjustment. However, instead of using the actual lighting conditions to adjust the screen brightness, it works depending on the time of day. Users can either set a period for warmer lighting themselves or use sunrise and sunset times. Windows is already aware of these times.

Screen brightness might be tricky to control. On some machines physical hardware switches are missing and software solutions may not work well. However, it is generally possible to find a functional method for a given hardware. This article aims to summarize all possible ways to adjust the backlight.

There are many ways to control brightness of a monitor, laptop or integrated panel (such as the iMac). According to these discussions and this wiki page the control method can be divided into these categories:

brightness is controlled by either the ACPI, graphic or platform driver. In this case, backlight control is exposed to the user through /sys/class/backlight which can be used by user-space backlight utilities.

Note: Since OLED screens have no backlight, brightness cannot be controlled by changing backlight power on laptops equipped with an OLED screen. In this case, perceived screen brightness can be adjusted with a PWM control (not implemented in the Linux kernel) or via software color correction.

The brightness of the screen backlight is adjusted by setting the power level of the backlight LEDs or cathodes. The power level can often be controlled using the ACPI kernel module for video. An interface to this module is provided via a /sys/class/backlight/.

In this case, the backlight is managed by an ATI graphics card. In the case of an Intel card, the directory is called intel_backlight. In the following examples, acpi_video0 is used. If you use an Intel card, simply replace acpi_video0 with intel_backlight in the examples.

By default, only root can change the brightness by this method. To allow users in the video group to change the brightness, a udev rule such as the following can be used:

Reason: Explain why it is not possible to alter file permissions with GROUP="video", MODE="0664". (Discuss in Talk:Backlight#Udev rules for permissions of brightness doesn"t work)

Sometimes ACPI does not work well due to different motherboard implementations and ACPI quirks. This results in, for instance, inaccurate brightness notifications. This includes some laptops with dual graphics (e.g., Nvidia/Radeon dedicated GPU with Intel/AMD integrated GPU). Additionally, ACPI sometimes needs to register its own acpi_video0 backlight even if one already exists (such as intel_backlight), which can be done by adding one of the following kernel parameters:

Note: The systemd-backlight service restores the previous backlight brightness level at boot. To prevent conflicts for the above rules, see #Save and restore functionality.

Tip: To set the backlight depending on power state, see Power management#Using a script and an udev rule and use your favourite backlight utility in the script.

In some cases (e.g. Intel Mobile 945GME [1]), it is possible to set the register of the graphic card to adjust the backlight. It means you adjust the backlight by manipulating the hardware directly, which can be risky and generally is not a good idea. Not all of the graphic cards support this method.

DDC/CI (Display Data Channel Command Interface) can be used to communicate with external monitors implementing MCCS (Monitor Control Command Set) over I2C. DDC can control brightness, contrast, inputs, etc on supported monitors. Settings available via the OSD (On-Screen Display) panel can usually also be managed via DDC. The kernel module i2c-dev may need to be loaded if the /dev/i2c-* devices do not exist.

Users of NVIDIA"s proprietary drivers may need to add Option "RegistryDwords" "RMUseSwI2c=0x01; RMI2cSpeed=100" to the Device section in /etc/X11/xorg.conf.d/20-nvidia.conf (generated by nvidia-xconfig) or options nvidia NVreg_RegistryDwords=RMUseSwI2c=0x01;RMI2cSpeed=100 to /etc/modprobe/conf.d/nvidia.conf. Confirm that the settings are correctly applied with grep RegistryDwords /proc/driver/nvidia/params and check that the values are not empty. See [2] and [3]

ddcutil will fail to set some VCP features if there is a feature enabled on the monitor which already automatically adjusts them (e.g. Dynamic Contrast Ratio or BenQ"s Eye Care technology).

To facilitate binding screen brightness control to a keyboard shortcut, it may be convenient to enable non-superuser access to the relevant I2C devices. This can be achieved by adding a group i2c and configuring udev to set this group as the owner of the I2C devices. See [4].

Switching off the backlight (for example when one locks a notebook) can be useful to conserve battery energy. Ideally the following command should work for any Xorg graphical session:

If the previous commands do not work, there is a chance that vbetool may work. Note, however, that in this case the backlight must be manually activated again. The command is as follows:

The systemd package includes the service systemd-backlight@.service, which is enabled by default and "static". It saves the backlight brightness level at shutdown and restores it at boot. The service uses the ACPI method described in #ACPI, generating services for each folder found in /sys/class/backlight/. For example, if there is a folder named acpi_video0, it generates a service called systemd-backlight@backlight:acpi_video0.service. When using other methods of setting the backlight at boot, it is recommended to stop systemd-backlight from restoring the backlight by setting the kernel parameters parameter systemd.restore_state=0. See

Note: Some laptops have multiple video cards (e.g. Optimus) and the backlight restoration fails. Try masking an instance of the service (e.g. systemd-backlight@backlight:acpi_video1 for acpi_video1).

Note: The utilities in the following table can be used to control screen brightness. All of them are compatible with Wayland and do not require X. Some (like video (or input) group to modify brightness.

Manages screen temperature (Xorg only) and smoothly dims brightness after a timeout. Supports ambient light sensors [5]. Can turn webcam into an ambient light sensor.

Automatic brightness adjustment based on screen contents and ambient light. Can use webcam or time to simulate ambient light sensor. Supports keyboards and external monitors. Uses wlroots.

Tip: Commands involving these utilities can be bound to the XF86MonBrightnessUp and XF86MonBrightnessDown keyboard keys as described in Keyboard shortcuts#Xorg.

If you get the "No outputs have backlight property" error, it is because xrandr/xbacklight does not choose the right directory in /sys/class/backlight. You can specify the directory by setting the Backlight option of the device section in /etc/X11/xorg.conf.d/20-video.conf. For instance, if the name of the directory is intel_backlight and using the Intel driver, the device section may be configured as follows:

Note: Using this with an iGPU+dGPU setup can cause unpredictable screen update lag and/or flickering in user interface items inside apps that are offloaded to the dGPU. Only use this if all else fails.

If you have enabled Intel Fastboot you might also get the No outputs have backlight property error. In this case, trying the above method may cause Xorg to crash on start up. You should disable it to fix the issue. It is known to cause issues with brightness control.

$ gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Set org.gnome.SettingsDaemon.Power.Screen Brightness ""

$ gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepUp

$ gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepDown

Color correction does not change the backlight power, it just modifies the video lookup table: this means that your battery life will be unaffected by the change. Nevertheless, it could be useful when no backlight control is available (desktop PCs or laptops with OLED screens).

Clight — User daemon utility that aims to fully manage your display. It can manage the screen temperature depending on the current time of the day, just like redshift does. It tries to use

Redshift does not support Wayland (without a patch or fork like AUR). But it is possible to apply the desired temperature in tty before starting a compositor. For example:

This should roughly double luma in the image. It will sacrifice color quality for brightness, nevertheless it is particularly suited for situations where the ambient light is very bright (e.g. sunlight).

This can also be used to reduce perceived brightness in a dark room by specifying some value less than 1 (e.g. 0.5), this is useful when no backlight control is available (e.g. desktop PC).

Users of NVIDIA"s proprietary drivers can change display brightness via the nvidia-settings utility under "X Server Color Correction." However, note that this has absolutely nothing to do with backlight (intensity), it merely adjusts the color output. (Reducing brightness this way is a power-inefficient last resort when all other options fail; increasing brightness spoils your color output completely, in a way similar to overexposed photos.)

Reason: Modern LED display using IPS panel usually utilize DC dimming instead of PWM dimming. This can be indicated by the two upper bytes of 0xC8254 register 0x0001, which means the frequency is almost infinity. (Discuss in Talk:Backlight)

Laptops with LED backlight are known to have screen flicker sometimes. This is because the most efficient way of controlling LED backlight brightness is by turning the LED"s on and off very quickly varying the amount of time they are on.

However, the frequency of the switching, so-called PWM (pulse-width modulation) frequency, may not be high enough for the eye to perceive it as a single brightness and instead see flickering. This causes some people to have symptoms such as headaches and eyestrain.

Period of PWM (inverse to frequency) is stored in 2 higher bytes of 0xC8254 register (if you are using the Intel GM45 chipset use address 0x61254 instead). To manipulate registers values install

Embedded Display Port (eDP) v1.2 introduced a new display panel control protocol for backlight and other controls that works through the AUX channel [7]

Note: This behavior and their workarounds have been confirmed on the Dell M6700 with Nvidia K5000m (BIOS version prior to A10) and Clevo P750ZM (Eurocom P5 Pro Extreme) with Nvidia 980m.

On some systems, the brightness hotkeys on your keyboard correctly modify the values of the acpi interface in /sys/class/backlight/acpi_video0/actual_brightness but the brightness of the screen is not changed. Brightness applets from desktop environments may also show changes to no effect.

If you have tested the recommended kernel parameters and only xbacklight works, then you may be facing an incompatibility between your BIOS and kernel driver.

A workaround is to use the inotify kernel api to trigger xbacklight each time the value of /sys/class/backlight/acpi_video0/actual_brightness changes.

Due to a bug introduced recently in the amdgpu driver, the backlight"s actual_brightness value is reported as a 16-bit integer, which is outside the 8-bit range specified in max_brightness. This causes the systemd-backlight service to attempt to restore, at boot time, a value that is too large and ends being truncated to maximum brightness (255).

While the bug is not addressed, one possible workaround is to modify the stored brightness to within the correct range before it is restored. This can be accomplished with a script and a service unit:

On certain systems, the backlight level reported by the driver is in the correct range [0, 255], but systemd still fails to restore the correct value. This is probably due to a race in the kernel. In this case, truncating the brightness level will not help since it is already in the correct range. Instead, saving the brightness level to systemd before shutting down could work as a workaround. This can be accomplished by the following script and service unit:

If you are having difficulty reading the information displayed on the LCD, try changing the contrast setting. Adjusting the contrast will give the information a sharper and more vivid appearance.

Adaptive Brightness is a feature on both old and new Android phones that automatically adjusts your screen"s brightness based on the ambient lighting conditions. It makes it easier to read your phone in different lighting environments with the added advantage of conserving battery life.

Adaptive Brightness uses on-device machine learning to learn your habits when you tweak the brightness slider manually and integrates them into the auto settings. A feature that manages itself sounds like an excellent solution for many.

However, Adaptive Brightness may not always work as intended. It can become glitchy, making your screen too bright in a dark room or too dim outside. If you"ve given it a few days and it"s still messing up, there are three things you can do to recalibrate the feature.

This is a quick and easy way to recalibrate Adaptive Brightness. From here, the device learns your lighting habits all over again and hopefully works out better. It isn"t a guaranteed fix, but it"s worth recalibrating to find out if it improves your experience. This setting is hidden from the average user.

The example screenshots are shown using a Pixel phone. However, most modern Android devices also have an Apps section. Each manufacturer might list it in a slightly different location, so search the settings menu for "apps" or "all apps" to find it.

If the reset method doesn"t work properly, clear the app data. Navigate to your app list and select Device Health Services. However, instead of tapping the Reset adaptive brightness button, tap the Clear all data button followed by OK.

When you select Clear all data,everything in the Device Health Services app is deleted, including battery stats. So, only go this route if the resetoption fails.

If none of these tips worked for you, keep an eye out for software updates that include fixes to the auto-brightness feature. Although Google usually lists Adaptive Brightness bug fixes in update logs, it occasionally omits details that affect some users.

These issues can cause problems beyond what you can troubleshoot yourself. If that"s the case, you"ll likely have to wait for an official fix from your device manufacturer. Make sure the issue is listed on the manufacturer"s forums and mention the problem on social media, as manufacturers tend to step up the pace when there"s a lot of visibility around a bug.

Adaptive Brightness is a great feature when it works correctly. You don"t have to adjust the illumination when you"re outside on a sunny day or unlock your phone in the dark. Still, it can be frustrating when it doesn"t work as intended.

Instead of disabling the feature, follow the troubleshooting steps outlined in this guide to reset the adaptive brightness settings and restore the ideal behavior. Once you have Adaptive Brightness in check, tweak your device a little more by customizing your Material You theme.

The bright or dim setting of the system display is adjustable. This is useful to make the display more or less noticeable in bright or dark environments.

There are two display brightness settings: one for bright environments and one for dim environments. When the surrounding light is bright, you can adjust the bright room setting; when surrounding light is dim, you can adjust the dim room setting.

There are two display brightness settings: one for bright environments and one for dim environments. When the surrounding light is bright, you can adjust the bright room setting; when surrounding light is dim, you can adjust the dim room setting.