A backlight is a form of illumination used in liquid crystal displays (LCDs).

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29
votes
6answers
44k views

How do I set default display brightness?

Is it possible to set the default display brightness so you don't have to re-adjust it everytime you reboot? My laptop display is killing my eyes at the login screen already because it starts at 100% ...
12
votes
9answers
38k views

Cannot change backlight brightness Ubuntu 14.04

This morning I found that I cannot change the brightness of my Dell XPs 13 laptop's display anymore. I tried the following to change the brightness Use keyboard brightness keys Run the commands ...
22
votes
5answers
12k views

Decrease Backlight Below Minimum

I have this laptop that doesn't handle the backlight very well. In /etc/default/grub, I have added a acpi_backlight=vendor function to get it to work at all. Which is cool, and the backlight now ...
4
votes
1answer
11k views

How to use xbacklight with brightness keys in a VAIO

I have a Sony VAIO VPCCW15FL, with Ubuntu 12.04 installed. Sadly, the brightness keys do not work out of the box, although the brightness meter reacts to the brightness up/down keypresses. Yesterday,...
3
votes
2answers
5k views

13.10 Can't Adjust Dell Laptop Backlight

I have a Dell Studio 1558. When I originally installed 13.04 on it, I had to modify my /etc/default/grub with the following: GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor dell_laptop.backlight=0 ...
11
votes
11answers
7k views

How to increase brightness in smaller steps?

Is there a way to adjust lighting step ? I have Lenovo L520, and Fn + Light Up or Down adjusts by 20%, how can I adjust the step to 10% ? it will help me fine tune lighting at my dark room.
11
votes
5answers
22k views

I cannot change the screen brightness

here's my problem: Ever since I installed Ubuntu 12.10 on my computer I haven't been able to change the screen brightness, it was always set to the maximum. I did take a look at this post: Decrease ...
1
vote
1answer
7k views

Keyboard light hotkey (Fn + F3 and F4) rarely work on an Asus G60J

Im using Ubuntu 12.04, and my laptop is an Asus G60J. Specifications: Ubuntu 12.04 64bit Intel i7 720qm Nvidia gtx 260m 4gb RAM The laptop always start with the keyboard backlit On. The hotkeys ...
7
votes
2answers
1k views

Dell XPS 13 9343 - keyboard backlight on at boot Ubuntu 15.10

I upgrade from Ubuntu 15.04 to Ubuntu 15.10 and now on the first boot the keyboard backlight is on. I can manually turn it off, but the setting is not remembered and the next boot results in the ...
3
votes
3answers
38k views

Keyboard backlight not working on an Asus N56V

See this question. The FN keys are not working Using answer in this question I installed the asus-wmi-dkms_0.2_all.deb.gz package Now, using xev I see that the keys emit keycodes (for backlight ...
3
votes
1answer
4k views

How do I make Fn+f2/f3 change the brightness on my HP dv7-6135dx?

The problem described below riddled me for quite a while and couldn't find a straight forward answer anywhere online. I have found a solution and I would like to use this post as a documentation ...
5
votes
5answers
8k views

Backlight can't be turn on in Acer Aspire 4736

When I booted up my newly installed Ubuntu 11.04, I discovered, to my dismay, that the backlight was off by default. The keyboard shortcut (which is Fn+F6 on my Acer Aspire 4736) for turning on the ...
8
votes
2answers
7k views

How do I deactivate dynamic contrast on a Dell XPS?

I am experiencing annoying automatic backlight brightness changes under ubuntu 12.04 LTS on my Dell XPS ultrabook. It seems to be connected to the amount of white pixels on the screen (switching ...
2
votes
1answer
3k views

Start asus laptop UX32VD with keyboard backlight off

I'd like a way to set the default keyboard backlight state to "off". I'm running Ubuntu 13.04 on an Asus Zenbook UX32VD. All the function keys work, but currently I have to turn off the keyboard ...
7
votes
1answer
9k views

How to stop gnome-power-manager from changing the global backlight setting?

After installing Ubuntu on my ThinkPad T510, the GDM screen and GNOME session would always start at 100% brightness. I quickly found out, that this can be controlled via gnome-power-preferences, but ...
3
votes
5answers
5k views

After installing fglrx on Ubuntu 14.04 there is no backlight (hd 5470). Is there any workaround?

I've installed fglrx driver on my Asus k52je laptop with mobility radeon hd 5470 using additional drivers window in ubuntu. I get black screen after reboot. When I hold power button i can barely see ...
1
vote
3answers
2k views

Brightness Hotkeys Only Slightly Work

I just installed Precise on my Samsung Laptop (QX412-S01au, using Ubuntu 2D). The brightness hotkeys sort of work: Adjusting the brightness using the slider in the control panel works just fine ...
4
votes
1answer
4k views

Ubuntu 15.04 Suspend doesn't run `pm-suspend`

After upgrading to Ubuntu GNOME 15.04 (from 14.10), I noticed my pm-utils hooks in /etc/pm/sleep.d aren't running anymore on suspend/resume. I have a custom script which saves the brightness before ...
3
votes
0answers
488 views

Switch off laptop backlight when locking screen [duplicate]

Possible Duplicate: How can I disable backlight when I lock the screen? I'm using an IBM Thinkpad t61 and wish to have the backlight switched off when locking the screen.I've been told to use ...
0
votes
2answers
4k views

Sony Vaio-Brightness Settings not Changing

I've searched for this problem but I cant find a straight answer. If I go into /etc/class/backlight, there's nothing there. Could someone help? I have the Nvidia Driver installed, and the Fn keys ...
12
votes
3answers
13k views

Increase screen idle dim timeout

On Ubuntu 11.10, when on battery, the screen dims after 10 seconds of inactivity. This is annoying because it is too short. Is there anyway to increase this timeout? I know I can disable it, but ...
16
votes
6answers
60k views

How to make keyboard backlight Fn buttons work in Samsung Series 9?

I've just installed Ubuntu 12.10 on my Samsung 900X4C. However, I can't get the keyboard backlights to work. I added the keymaps as per community docs - Samsung Series 9 (section Function Keys). But ...
8
votes
4answers
7k views

Reverse-Engineer Driver for Multi-colored Backlit Keyboard on Clevo Laptops

Here's my situation: I recently purchased a Sager NP9170 (same as the Clevo P170EM) and it has a multi-colored, backlit keyboard. Under Windows 7, you can launch an app that allows you to change the ...
9
votes
5answers
5k views

Macbook Pro boots with full screen brightness and keyboard backlight

I have dual-booted my Macbook Pro with Ubuntu 12.04 . Whenever i log-in to Ubuntu, it does so with full screen brightness and keyboard backlight at full . How do i get rid of this? How can i tweak the ...
7
votes
2answers
7k views

How to disable Macbook keyboard backlight

How do I disable the keyboard backlight, by turning it completely off, on a Macbook in 12.04? Whenever I reboot, Ubuntu sets the backlight to 100% brightness, and frustratingly the new function keys ...
3
votes
5answers
4k views

Last couple of fglrx drivers on Ubuntu 12.04 have backlight support broken

I've been keeping up with latest fglrx releases on AMD's website and it appears that both the last stable (13.4) and beta (13.6) drivers have brightness broken in Ubuntu 12.04 with all the latest ...
10
votes
3answers
43k views

Enable the keyboard backlights on supported Lenovo (e.g. Carbon X1) with command

Some Lenovo laptops have keyboard backlights, and they can be turned on using Fn + Space. There are three states: off, normal and bright. When I start Ubuntu, these laptops always default back to a ...
5
votes
3answers
5k views

Why does Ubuntu reset brightness settings at the loading screen?

Since I first installed Ubuntu 11.10, I noticed that volume and screen brightness get reset every time Ubuntu starts. Why is this so? And what ways are there to keep brightness and volume levels ...
7
votes
1answer
268 views

“monitor brightness down” key resets brightness before lowering it

My monitor brightness down key resets my brightness before lowering it, effectively leaving me at near max brightness. I do not experience any problems with the brightness up key. I'm using a Dell ...
6
votes
1answer
789 views

Can you help me write a script to set a new default brightness for the screen/keyboard after login?

On my Macbook Pro Ubuntu alsways boots with... keyboard brightness at maximum illumination screen brightness at maximum illumination ...both which I need almost never during normal usage. ...
3
votes
0answers
2k views

Can't change screen brightness running Ubuntu 14.04LTS on Samsung NP510R5E

FIXED! After DBANing my hard drive I installed Ubuntu 14.04LTS and quickly realised I've been unable to change screen brightness. This isn't too much of an issue when AC power is plugged in as the ...
2
votes
1answer
3k views

GUI changes brightness in wrong /sys/class/backlight/*/brightness

When I use Fn+F6 / F7 (brighness down and up on Toshiba) the brightness notification opens up and responds, but the actual screen brightness remains unchanged. When I go to Settings > Brightness and ...
2
votes
1answer
357 views

Turn off keyboard backlight, Asus laptop (Ubuntu 15.10)

When I boot up my laptop (Asus K501UX) keyboard backlight is turned on automatically. I want to turn it off by default, when Ubuntu is loaded, without using any hot keys. sudo find /sys/class/leds/ ...
1
vote
4answers
4k views

HP Pavilion g6 laptop backlight turns off at login screen

I've seen posts like these but they all seem to mention the inability to get the brightness back up. I can turn the brightness back up with my keyboard, but it's an annoyance that I'd like to get rid ...
1
vote
1answer
741 views

How to prevent screen from going black (back light is shut down) at startup (laptop) Ubuntu 12.04?

So,in may laptop with Ubuntu 12.04, the startup is like this: 1) I see the Ubuntu logo with the 5 dots on a purple background for a few seconds. 2) The screen goes completely black (no back light), ...
1
vote
1answer
3k views

How to fix Acer Aspire 4736z back light brightness control in Ubuntu 13.04?

A simple way to fix Acer Aspire 4736z back light brightness control problem using hot keys (Fn + Brightness +-)
1
vote
1answer
1k views

No brightness control on Asus 75 laptop

How can I get the brightness on my ASUS G75 laptop to work in Ubuntu 12.10 alpha? On my MacBook Pro, there used to be an nvidia-bl-dkms module. On my Dell XPS 15z, it worked out of the box. Now I ...
1
vote
2answers
879 views

Ubuntu 14.04LTS hangs when i change brightness of my display on Dell N5010 laptop

I have dell n5010 my system hang when I try to change brightness of the display and this happen only when my system on battery please help how to solve this problem
0
votes
1answer
147 views

Dell Precision M4500 laptop Keyboard backlight issues

While running (or more specifically loading ubuntu 16.04) ubuntu sets my keyboard backlight to off (brightness, not on/off, but lowest possible brightness). I setup Windows 7 (since it actually has ...
3
votes
2answers
1k views

Mac Keyboard Backlight ubuntu 12.04

Running Ubuntu 12.04, I can't get the keyboard backlight on a Macbook Pro (mid 2012) to turn on. When I press the brightness button, the display shows up on full but the lights do not turn on. It ...
3
votes
2answers
499 views

Macbook starts with the screen on minimum brightness

I have a Macbook2,1 with Ubuntu 12.04. When I start the computer the back light is on and I can see all of the boot stuff. Once the GUI begins to start up the backlight is turned completely off and I ...
2
votes
2answers
237 views

Is there an App that can make my desktop dimmer

I used an app in Windows 7, I think called dimmer to make the screen change its contrast settings so I could dim it lower than the controls of the PC defaults such as function key or the power options ...
2
votes
1answer
875 views

LCD backlight keys on Fujitsu Siemens Amilo Pro

I have a FS Amilo Pro V3505, which runs 12.04 fine, apart from an anomoly with the brightness. The function keys (Fn-F8 & Fn-F9) both control the LCD brightness as you would expect. However only ...
1
vote
1answer
935 views

Brightness and actual backlight mismatch after reboot

This is not a duplicate of this or that! The problem in detail The brightness hotkeys works well in increasing or decreasing the brightness, but if the brightness is less than 100%, after a reboot ...
1
vote
2answers
4k views

brightness settings not ajustable

I gave it a search and found this for version 11.04 on an acer aspire; sudo gedit /etc/default/grub Edit two lines to read as follows: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=...
0
votes
1answer
122 views

Brightness Does not work at all Samsung ultra book intel backlight

I have a problem with my 530U4E/540U4E Samsung Ultrabook Backlight settings; the system doesn't seem detect the change in brightness settings. To fix it I tried the "Intel backlight Fix" because my ...
0
votes
1answer
91 views

How to make my Toshiba u940 laptop's keyboard backlit to work?

I am using the latest Xubuntu x64 version as of this posting.. It's installed in dual boot with Windows 10.. the KB Backlight is working when I boot on Windows and from the bios.. The moment It enters ...
0
votes
1answer
1k views

/sys/class/baclight folder is empty, leading to blank screen [duplicate]

I recently tried to change the default brightness of my ubuntu by echoing values to /sys/class/backlight/acpi_video0/brightness, and installing xbacklight, as suggested by answers to other questions. ...
0
votes
1answer
461 views

How to make suspend work without the screen staying black afterwards?

I recently installed Ubuntu 14.04 on my laptop, and whenever I try to resume my computer after suspending it, everything starts up fine except my screen, which remains black (no backlight). My laptop ...
0
votes
2answers
1k views

Can't change brightness of laptop in ubuntu 14.04 / 15.04

When i just try adjusting brightness, the indicator changes but the screen does not change brightness. I have tried adding acpi_backlight=vendor to my grub file and also doing echo x > sudo tee /...