How To Adjust Screen Brightness On Lenovo Laptop

• Adjust Screen Brightness On Lenovo Laptop
• How To Adjust Screen Brightness On Lenovo Laptop Pro
• Laptop Screen Brightness Changes

Brightness adjustment keys <Fn + ⇑/⇓> have no effect (although they are recognized by the environment), and I can't change the brightness using GUI tools as well. This seems like a problem in Linux itself, not the desktop environment.

I can change the brightness in Windows OS, so it's not some kind of hardware fault.

Details:
Lenovo B570 (Model Name: 20093)
Integrated Intel HD graphics card
Kubuntu 11.04 (Linux 2.6.38-10-generic, KDE 4.7.0), everything up to date
No proprietary graphics drivers (only Wi-Fi one)

What I've tried:

• Edit /etc/default/grub↦GRUB_CMDLINE_LINUX_DEFAULT: acpi_osi=Linux, acpi_backlight=vendor, nomodeset. And yes, I did update-grub
• Edit /etc/X11/xorg.conf (no such file, even after sudo dpkg-reconfigure xserver-xorg)
• Edit /proc/acpi/video/VGA/LCD/brightness (no such file)
• sudo setpci -s 00:02.0 F4.B=XX (no effect)
• xbacklight -set XX ('No outputs have backlight property')

Hi, My sister's Lenovo Z500 is having a problem where you can't change the brightness of the monitor (brightness is stuck on very low). Plugged in or not doesn't change anything. How to fix brightness issue for Lenovo Yoga 730-15IKB laptop - Fix darken display or foggy display issues for windows - Fix brightness solutions; How to fix black screen for Lenovo Yoga 730-15IKB - fix black screen issue - screen is black - only a blank screen display - wont turn on anymore - black screen solutions / fixes. Hold down 'Fn' and press the 'Home' key, usually located in the top-right corner of the keyboard, to increase the brightness of the screen. Press 'Home' repeatedly to make the screen brighter. Hold down 'Fn' and press the 'End' key to decrease the brightness of the display.

How can I fix this issue?

Oleh PrypinOleh Prypin

15 Answers

Try this. It worked for my Ubuntu 14, Lenovo B570, Intel Graphics.

Open a terminal and create the following configuration file, if it does not exist:

sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf

Now we need to edit this file. You can use any editor be it a terminal one or graphical.

sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

Add the following lines to this file:

Save it. Log out and log in back.

If the GUI tools fail, try to use the terminal for it.

1. Run: ls /sys/class/backlight/*/brightness. Example output would be:

2. If nothing is found, the kernel does not support brightness control (missing drivers?). Otherwise, you can use the below commands (replace acpi_video0 accordingly):

   • Get the current brightness level: Iron man 3 full movie in hindi online torrent download.

   • Get the maximum brightness level:

   These commands return brightness levels which ranges from zero to max_brightness (see above).

3. To change the brightness level, you need to write a number to the brightness file. This cannot be done by an editor like gedit. Say you want to change your brightness to 5, you have to run:

   Alternatively, if you just want to set the brightness level to the highest available:

LekensteynLekensteyn

1. Install linux-kamal-mjgbacklight - a patch for Linux kernel.

   • Check whether it will work for you:
     lsmod grep ^i915
     Something like i915 331519 3 should appear. If there's no output, this will not work.
   • sudo add-apt-repository ppa:kamalmostafa/linux-kamal-mjgbacklight
   • Install updates (sudo apt-get update; sudo apt-get upgrade)

2. Reboot.

3. Now you can use the terminal to adjust brightness, as suggested by Lekensteyn.
   If it's OK for you to change brightness with terminal+sudo, this is the end of the answer.
   If you are on GNOME desktop, brightness may even function fully already.

4. Download my brightness changer script, allow it to be executed, and put it to /usr/local/bin/:
   wget -O brightness http://ideone.com/plain/yPlo5
chmod +x brightness
sudo mv brightness /usr/local/bin

5. We have to allow the brightness file to be edited, so that sudo isn't needed everywhere.
   Also, we want to make the brightness setting restore itself to the previous setting when the system boots (it is not saved by default, unfortunately).

   The mentioned brightness script can handle it all (with restore parameter), just add it to autorun.
   To do this we will edit /etc/rc.local (sudo nano /etc/rc.local or any editor instead of nano).
   Add the following line before the exit 0 line:
   /usr/local/bin/brightness restore

6. It is best to reboot now.

7. So the brightness script works. You may go to terminal any time and type these:

   • brightness - get current brightness setting
   • brightness value - set the brightness to value
   • brightness inc step, brightness dec step - increase or decrease the brightness by step (if it's not specified, a default value is used from the configuration file, usually 10% of maximal brightness)

8. Now you might want to map brightness change to your hotkeys.

   • Set XF86BrightnessUp to brightness inc
   • Set XF86BrightnessDown to brightness dec

9. If you want to tweak something, make sure to look at /etc/bx_brightness.conf
   You can change the step by which brightness is changed with brightness inc/dec

Thanks to Toz for his priceless help in this thread.

Oleh PrypinOleh Prypin

I think I found an easy and least effect to the existed things' way for adjusting intel_backlight using udev rules.

I noticed 'change' action of 'backlight' subsystem when I press Fn+Up/Down on my Lenovo G360 notebook running kernel 3.2. So I wrote a rules of /etc/udev/rules.d/99-writeintelbacklight.rules as below:

Make the shell script /usr/sbin/writeintelbacklight.sh contain:

Of course, you need do a sudo chmod +x /usr/sbin/writeintelbacklight.sh.

Eliah Kagan

Adjust Screen Brightness On Lenovo Laptop

This will not get your Fn keys working, but you will be able to assign any other key to adjust brightness.

I tried several of these solutions, but nothing worked for me until I found this little indicator program http://codevanrohde.nl/wordpress/?p=128. With it you can set up hot keys to control brightness, use your mousewheel or select from a drop down list in the indicator. I have replaced 'Fn' with 'Win+Alt' which is very similar for my hands and now I can also use it with an external keyboard!

To add PPA and install:

Hot keys should be assigned to:

and

Footnote: Out of the box, the birghtness indicator recognizes 7 levels of brightness in my system. By adding acpi_backlight=vendor to the line GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, that number is bumped up to 16!

I have a lenovo ideapad z400.

I tried all the TIPS listed above, no success.

So I found a different one that worked very well :

Put the following line in /etc/default/grub

YY = Swap area, use swapon -s to see you swap device.

Execute an update-grub as root

After the reboot the problem was solved.

I have a Thinkpad T450s with Nvidia graphics and binary drivers on Ubuntu 14.04. In order to get the backlight working I had to edit the /etc/X11/xorg.conf file by adding the following line to the intel device definition (The xorg.conf-file is created when installing the binary drivers):

The complete section is now:

This doesn't work for KDE users as it written in https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight

NOTES FOR KDE DESKTOP USERS

KDE desktop users: This PPA may NOT fix your backlight control hotkeys: This fix requires a kernel module to supply the new /sys/class/backlight/intel_backlight interface (which will work regardless of your desktop) and also a desktop module to access that interface. For Gnome, the updated gnome-power-manager in this PPA supplies that, but the equivalent for KDE has not yet been developed.'

However you can try a workaround found here.

That says to type in the terminal echo XXX sudo tee /sys/class/backlight/intel_backlight/brightness where XXX is an integer value.

In my case XXX can be a value from 0 to 4882, but be careful: if you write 0 the screen will be completely black and you'll se nothing.

Bruno Pereira

Here is a patch you can do.

Create this script with the name .modificarBrillo.sh (in my case I created it in my home folder: ~/.modificarBrillo.sh)

However as the previous script needs execution permission and /sys/class/backlight/intel_backlight/brightness can only be edited by root and you have to execute in terminal:

The last command has to be executed every startup because the permissions of the brightness file are renewed with the startup. For doing so sudo vim /etc/rc.local and add the command sudo chmod a+w /sys/class/backlight/intel_backlight/brightness before the 'exit 0' line

Finally you should install xbindkeys to assgin the Function key to execute the script.

In my case I add the lines to the configuration file ~/.xbindkeysrc

But you could also install the program xbindkeys-config to do the proccess graphically.

Edit the /etc/default/grub file and add
pcie_aspm=force acpi_backlight=vendor after
GRUB_CMDLINE_LINUX_DEFAULT='quiet splash'

Then the whole line will look like this:

For more detail visit this link.

Severo Raz

I had the same issue, I am using Gnome3.10 in ubuntu 14.04 ( Unity). I installed tlp for temperature control in my laptop. I just removed 'tlp' and I rebooted my system and I am able to adjust screen brightness using function(fn) + arrow keys.

It might help check it once.

Had same problem (apparently) with a Lenovo IP G50-70. - In fact, none of the function keys 'appeared' to work. Eventually in the Bios I found a 'Hotkey' enable/disable function. Paradoxically, it was 'Enabled', but this in fact enables a single key press operation for the function keys. In fact, if you use the traditional 'Fn + Function keyX' technique, they don't work.

If you 'Disable' the hotkey function in the Bios, then the function keys work 'as expected' (Fn + Function Keyx). - After doing this, all the function keys worked OK. So much for progress

I had to add these lines to grub:

Note that last one. That was the one that made the brightness keys work.

I was having a problem on a Thinkpad W510 running kubuntu 18.04.

I found this on a Lenovo forum:

tpb - program to use the IBM ThinkPad(tm) special keys

Voila! Brightness adjustment keys now work perfectly! I did not even need to log out and back in.

You can use this package to deal with brightness from the command line (terminal), with the xbacklight command.

xbacklight can be installed in the Software Center. Or in the Terminal:

you can use

• xbacklight -inc <range from 0 to 100> to increase brightness with value < .. >

• xbacklight -dec <range from 0 to 100> to decrease brightness with value < .. >

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Increase or decrease screen brightness in Windows 10

There are a number of ways to control screen brightness on Windows 10 PCs. You can usually adjust your screen brightness with keyboard commands that vary by computer manufacturer, or you can set screen brightness from Windows 10 settings.

1. Go to Settings>System>Display
2. From there, you can change brightness from low to high with the slider
3. You can also choose to “change your screen brightness automatically when your lighting changes,” but this usually sets your brightness higher than normal, so be aware that this can affect battery life
4. You can also change Night Light settings, which uses warmer colors at night, which may help you sleep after using a computer before bed

Applies to All Windows 10 Versions

Whether you are using a Microsoft Surface product or another Windows 10 PC like the Lenovo Yoga 730 15-inch, you might be wondering what options you have to adjust screen brightness. There are several options available to adjust screen brightness for all types of scenarios. Microsoft knows that working on your PC during the day and night can strain your eyesight, disrupt your sleep, and have other long-term damaging effects to your health. Let’s take a look at what options you have to adjust screen brightness on Windows 10.

Keyboard Shortcuts

Microsoft Surface products, including the Surface Pro, Surface Book 2, or Surface Laptop, you need to first press the Function key (Fn), then press F1 to decrease screen brightness or F2 to increase screen brightness. If you don’t own a Surface, you might not be so lucky and not have a dedicated key to change your screen brightness. On other Windows PCs, the keyboard shortcuts can vary greatly depending on the make and model. Check your PC manufacturer’s website for more information and support.

Settings

All Windows 10 PCs have this option available in their settings. Here are the steps you need to take to get to adjust screen brightness:

1. Go to Settings
2. Go to System
3. Go to Display

From here, you’ll be able to set your screen brightness to your desired level (high or low) or chose the option to change your screen brightness automatically when your lighting changes. Automatically changing your screen brightness based on your background lightning is great, but this setting usually favors a brighter screen brightness setting, which will negatively affect your Windows 10 PC’s battery life.

Night Light

Another option in your display is Night light. Night light changes your screen brightness when you are using your PC after sunset. Night light can help you get to sleep by displaying warmer colors at night. If you go into Night lightsettings, you can change the color temperature at night to a setting that is comfortable for your eyes. You can also schedule when night light turns on and off. By default, night light starts at sunset and ends at sunrise. Your sunrise and sunset times are detected automatically based on your location.

Other Settings

Other settings options under Display include changing your Windows PC’s color profile to either Enhanced or sRGB. There is no added battery life associated with which color profile you choose. Enhanced is there to be visually pleasing whereas sRGB (standard Red Green Blue) is the industry standard created by Microsoft and HP in 1996. sRGB is used as a color standard on all Windows PC displays, printers, and webpages. Using sRGB is required if you are doing professional photo editing work.

How To Adjust Screen Brightness On Lenovo Laptop Pro

Additional settings available include the ability to change the size of text, apps, and other items by changing the scale and layout of your PC’s display. Resolution, screen orientation, and the option to connect to a wireless display is also available. Sometimes, OEMs have additional screen brightness calibration software available, so it might be wise to check their website for additional support.

Laptop Screen Brightness Changes

Further reading: Microsoft, Settings, Surface Book, Surface Book 2, Surface Laptop, Surface Pro, Windows 10, Windows 10 PC