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

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Brightness control on Toshiba P855-30D

This seems to be a recurring question, but none of the solutions I found here and there seem to work for me. So here are the facts: Toshiba Satellite P855-30D Nvidia 640M BIOS 1.50 Ubuntu 13.04 64 ...
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1answer
225 views

Screen backlight is Disabled After Installing Nvidia GeForce 9600m GT Drivers

since several weeks ago, I am in the quest for try to fix the back-light control on my Sony VGN-AW220j With Nvidia GeForce 9600M GT, but until date no luck after try so many recipes and fixes from ...
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2answers
2k views

Screen brightness stuck on max setting, FN+down only brings it down one level

EDIT: Updating to Ubuntu 13.10 solved this issue for me out of the box. I'm trying to get some control over the brightness of my Samsung QX411 (Integrated Intel graphics) on Ubuntu 3.04 (though I ...
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5answers
1k views

The dreaded Brightness issue (Fn keys + Max brightness)

EDIT: Updating to Ubuntu 13.10 solved this issue for me out of the box. I'm trying to get some control over the brightness of my Samsung QX411 (Integrated Intel and discrete Nvidia, though Ubuntu ...
2
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0answers
2k views

Default Keyboard brightness is not working

I am running Ubuntu 13.04 64-bit on an Asus UX31A. To control the default screen and keyboard brightness after the start, I wrote this to the rc.local: echo 0 > ...
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2answers
3k 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 ...
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2answers
237 views

Keyboard light and screen brightness at 100% after startup

After every restart the default screen and keyboard light is at 100% and it is quite annoying. Is there a workaround for this?
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1answer
992 views

Keyboard backlight command by percentage

I want to make a keyboard shortcut to increase and the decrease the keyboard backlight brightness. The command I have for full brightness is: echo -n 100 > ...
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0answers
320 views

Backlight control keys with nvidia driver work sometimes

I've got a Vaio S11 laptop with Nvidia 310M graphics running Ubuntu 13.04 with nvidia graphics driver (nvidia-310). Backlight control started working since I created a .conf file in ...
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1answer
2k 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 +-)
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1answer
1k views

Modifying brightness control shortcut key bindings

I have a Toshiba Satellite R830 laptop with Ubuntu 13.04.1 64 bit. The Fn + F6 and Fn + F7 buttons adjust brightness until I put my laptop on sleep. On wakeup they don't work any longer. On Ubuntu ...
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1answer
369 views

Make a script run at startup

First of all,sorry for my bad English. Im using Xubuntu 12.04 on Acer Aspire One D270.My Screen brightness hotkeys (Fn+L/R) dont work.I installed xbacklight but it always shows "No outputs have ...
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1answer
355 views

How to get the oBacklight solution to brightness problem working?

I can set the backlight using xrandr (although the mouse pointer stays sharply bright) but If I suspend the laptop, after waking it up it is on max brightness again. I have a Dell 17 L702x and I have ...
4
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1answer
7k 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. ...
2
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2answers
676 views

switcheroo to discrete turns off backlight on laptop screen

AMD cedar/ Intel ironlake hybrid graphics. Custom kernel 3.8.3. Free radeon xorg drivers. When I switch from integrated to discrete, I do a killall lightdm and X doesn't automatically respawn like it ...
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3answers
2k views

How do I change the backlight brightness on an iMac 12,2? [closed]

Problem: I can't adjust the brightness of my iMac and it's killing me. (My eyes! The goggles do nothing!). Has anyone gotten this to work? -Booting with rEFIt 0.14 -Product Name: iMac12,2 ...
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2answers
3k 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 ...
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1answer
2k views

samsung backlight

I have a Samsung Series 7 Chronos (700Z5C-S02UB) and a couple of kernel updates ago (I'm currently on 3.5.0-25-generic ), I lost the keyboard backlight support. Any idea on how to turn it back on? ...
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1answer
174 views

Backlight flickers after lid close and switch to battery

Ubuntu 12.10 32bit with Fallback DE. I need to set to Classic for Citrix Receiver to work properly. When screens are maximized with Unity, the mouse is offset. I can close and re-open the lid if on ...
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1answer
781 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 ...
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2answers
795 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 ...
2
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1answer
688 views

I can't dim my laptop's light

I can't modify my laptop brightness. Is it a BIOS problem? It works in win 7, but doesn't work in Ubuntu. It's an Acer Aspire 5750-6842 laptop with Intel HD graphics 3000 video chipset.
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0answers
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Brightness not working Acer Aspire One 756-2623 [duplicate]

Brightness not working Acer Aspire One 756-2623 with Ubuntu 12.04. Also the mousepad right-click isn't working ether. I'm completely new to Ubuntu and Linux in general. How do I fix it?
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1answer
518 views

Backlight goes off during Ubuntu installation

During 32-bit Ubuntu 12.04 LTS installation on HP laptops, the back-light goes off and become unable to proceed. I've experienced it on many hp laptops. Do anyone provide the reason or a solution for ...
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1answer
328 views

How do I get brightness controls working on a Dell XPS m1710?

I've been reading on for a while now on how to resolve the issue of my backlight not working. I'm using Dell xps m1710 and my Fn arrow keys are able to control the brightness slider but the actual ...
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6answers
39k 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 ...
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4answers
17k 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 ...
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1answer
641 views

How to make a patched DSDT work in 12.04?

My Samsung R428 laptop can't adjust the backlight with Ubuntu 12.04. Under Mac OS X 10.8.2, I patched the DSDT file and solved the same problem. I did some search, well, it seems DSDT overriding is no ...
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1answer
592 views

acpi_listen only detects every other backlight hotkey press

I am trying to get the LCD backlight brightness control to work properly on my new ASUS G75VW-DH72 laptop in Ubuntu 12.10. I got it to mostly work by following the instructions that I wrote here ...
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1answer
1k views

HP Spectre XT screen dim (completely dark) on boot. Can this be fixed? [duplicate]

When my computer boots up, the LCD backlight is completely blank. I have to increase the brightness using the keys on my keyboard, and only then am I able to see the login screen. I'm not sure how ...
0
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1answer
2k views

FN + F7 don't work (before allowed me to turn on/off display)

Here's my problem: I had Ubuntu 8.04 on this Notebook Asus 1015 px and the combination fn + f7 worked well and I could turn on/off the display at my leisure. Then I formatted and started a "new ...
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1answer
3k views

Brightness control increments brightness by 4 instead of 1

The value of /sys/class/backlight/acpi_video0/brightness increments by four when the brightness controls are used, but I am able to force the value to anything in [0-10]. I have a HP Envy 17-3200. ...
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1answer
722 views

Dim (NEARLY blank) laptop screen, secondary screen works - why?

My laptop screen is (almost) black while my secondary screen is fine. I believe it to be backlight / brightness related. Problem description it starts when I start the laptop system loads and works ...
5
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1answer
1k views

How can light sensor be enabled for control brightness and keyboard back-light automatically?

I have A Sony VAIO laptop F-series () Nvidia and it has light sensor. When I was using Windows, this light sensor controlled the brightness and the keyboard backlight automatically due to the ...
5
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2answers
1k views

How to increase the amount of steps of brightness adjustment-key

The screen of my laptop (Dell Vostro 3460) supports 16 levels of brightness: Not only according to the manufacturer, but also as is clear from two OSs: Both Windows 7 and Ubuntu (dual-booted) support ...
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2answers
5k 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 ...
6
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4answers
5k 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 ...
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1answer
1k views

Backlight does not work on Toshiba portege and LTS 12.04 [closed]

I have a Toshiba portege. Since some time I try to enable the backlit function but without success. I found several posts that should solve it, for example: Backlight Issue but it didn't work for me ...
2
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0answers
1k views

How to make backlight work on Acer 5732z?

I want to run 12.04 on my Acer Aspire 5732z. I know from research that these computers have issues with the backlight on Ubuntu. So I tried a couple of solutions: The sudo lightdm restart method. I ...
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1answer
481 views

12.04 backlight issue for Acer Aspire 5734z-4725 running on usb flash drive

I have followed the fix found here: Backlight Issue However I can't use the sudo update-grub2 command as it errors with /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?) ...
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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 ...
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1answer
676 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), ...
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2answers
5k views

Where can I find an updated asus-wmi-dkms package for Asus N56V?

I'm trying to use the answer for 166261 question. The suggested package ( install asus-wmi-dkms_0.2_all.deb.gz package (from http://ubuntuforums.org/showpost.php?p=12057336&postcount=49) ) seems ...
0
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2answers
766 views

Backlight settings not stored

Recently bought a new laptop (Samsung 700Z) and installed ubuntu 12.04. Most stuff works out of the box, but some details are driving me crazy. I installed the fglrx driver to shut down the fans and ...
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3answers
25k 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 ...
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0answers
1k views

Keyboard backlight support for Asus G55VW

The FN+F3 and FN+F4 key combinations are not able to control the keyboard backlight on my Asus G55VW. I could live with a command line solution so I tried the solution proposed here: ...
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3answers
3k views

Acer Aspire Backlight Problem

I have the same problem as found on this link Screen turns black after booting, backlight only works in recovery mode on an Acer Aspire 5736z I've never used any Linux before so if someone could ...
4
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3answers
4k 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 ...
2
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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 ...
0
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2answers
361 views

Brightness level is not restored back after some idle time when using fglrx

I have a laptop powered by fresh installation of Ubuntu 12.04 with XFCE. Before I have used a default opensource ATI driver. For several days I have been using fglrx. After some time of inactivity ...