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

learn more… | top users | synonyms

1
vote
0answers
67 views

SONY VPCEH26EN backlight not working with ubuntu

My sony vaio is not responding to the backlight control keys fn + f6 and f5 . Kindly give some solution .It is very important for me to get this.I have tried google but now my slide bar and fn key ...
0
votes
0answers
138 views

How to reconfigure kernel without reinstalling

The situation basically is after installing 13.04 I ended up with a host of odd issues which I hadn't had in 12.10 (no brightness controls, wifi not properly connecting, smeared plymouth screen) just ...
0
votes
0answers
118 views

backlight not found error AND full screen freezes

I use Ubuntu 13. My laptop is slow and unresponsive when I turn full screen on youtube. I can't make the laptop return to normal operation via usual methods, so I press the power button. It takes ...
2
votes
4answers
2k 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 ...
0
votes
1answer
248 views

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 ...
1
vote
0answers
232 views

Backlight Control Bar not working

I upgraded my 12.10 to 13.04 and the brightness control has completely disappeared! In the settings tab all the options are available except the brightness control bar I have attached the screenshot ...
0
votes
1answer
180 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 ...
2
votes
2answers
1k 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 ...
0
votes
5answers
722 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
votes
0answers
1k 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 > ...
1
vote
2answers
2k 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 ...
0
votes
1answer
111 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?
0
votes
0answers
83 views

How does the screen backlight work?

Everything about the backlight settings and controls work for me except: Backlight resets to max. on every reboot/boot. The backlight minimum goes on to complete black screen, instead of the minimum ...
2
votes
1answer
696 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 > ...
1
vote
0answers
280 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 ...
1
vote
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 +-)
1
vote
1answer
950 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 ...
1
vote
1answer
242 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 ...
0
votes
1answer
202 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 ...
0
votes
0answers
57 views

Asus K42JZ brightness/backlight returns to max whenever I restart

I have tried almost all the solution available in this forum but I got no luck. Every time I restart my Asus K42JZ, the brightness/backlight returns to MAX. Is there a specific way to solve this ...
3
votes
1answer
4k 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
votes
2answers
536 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 ...
4
votes
3answers
1k views

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

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 ...
0
votes
0answers
490 views

Screen brightness doesn't change (Ubuntu 12.04, HP Elitebook 8560w)

I have a HP Elitebook 8560w and I installed Ubuntu 12.04 on it. I can't adjust the screen brightness even though I can use the slider to lower the screen brightness, it doesn't have any effect. I ...
0
votes
2answers
2k 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 ...
1
vote
1answer
1k 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? ...
0
votes
1answer
125 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 ...
1
vote
1answer
625 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
0answers
313 views

Why can't I adjust the screen brightness?

I have a Toshiba Satellite laptop with an AMD 64-bit/Radeon HD video card, running Ubuntu 12.10. I can't adjust the brightness from the default maximum, neither the Fn keys nor the system settings ...
2
votes
2answers
514 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
votes
1answer
534 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.
1
vote
0answers
263 views

Nvidia control function key with xbacklight

I aways had problems with nvidia brightness control, and since 2009 I use the nvidiabl. But there is a issue that brightness sometimes came back to full backlight. So, since the nvidia is with new ...
1
vote
0answers
1k views

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?
0
votes
1answer
420 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 ...
1
vote
1answer
260 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 ...
16
votes
5answers
21k 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 ...
7
votes
4answers
12k 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
451 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 ...
1
vote
1answer
436 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 ...
0
votes
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
votes
1answer
819 views

FN + F7 don't work (before it allowed me to turn off the backlight LCD)

I thought this site could be useful but maybe I was wrong, or maybe I can't use it well (it's more likely!). Somebody can post a guide of how use properly this site? (I'm italian) But is more ...
4
votes
1answer
2k 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. ...
1
vote
1answer
588 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 ...
4
votes
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 ...
4
votes
2answers
573 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 ...
4
votes
2answers
3k 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
votes
3answers
3k 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 ...
3
votes
1answer
834 views

Backlight does not work on Toshiba portege and LTS 12.04

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
votes
1answer
967 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 ...
1
vote
1answer
440 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?) ...