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

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1answer
577 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
275 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 ...
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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?
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votes
1answer
464 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
270 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
26k 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 ...
10
votes
4answers
14k 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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vote
1answer
514 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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vote
1answer
476 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
969 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 ...
5
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
642 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
684 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
4k 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
4k 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
921 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
votes
1answer
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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vote
1answer
449 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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vote
1answer
914 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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vote
1answer
639 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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votes
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
votes
2answers
680 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 ...
3
votes
3answers
20k 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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votes
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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vote
3answers
2k 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
votes
2answers
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
votes
1answer
2k 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
votes
2answers
339 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 ...
6
votes
4answers
2k 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 ...
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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 ...
0
votes
1answer
887 views

Backlight problems with 12.04 on my Acer Aspire 4736z

How can I fix a bug that wouldn't let me turn the backlight on after it turns off automatically when I close the lid or when powersave settings kick in? I also can't adjust the brightness of the ...
5
votes
2answers
4k 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 ...
6
votes
1answer
649 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. ...
1
vote
2answers
5k views

no back light on my acer aspire 5734z

I installed Ubuntu (12.04) on my acer aspire 5734z and the back light stopped working. I have tried the fix by editing the grub file posted on here a couple of days ago but that hasn't fixed it. I ...
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vote
1answer
3k 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 ...
2
votes
2answers
1k views

Editing pommed.conf doesn't seem to have an effect

I am on a Macbook Pro 5,5 running 12.04 LTS, pommed v1.39, and Gnome Shell 3.4. On Macs you should install the pommed package to make full use of the media keys on mac keyboards: brightness for ...
2
votes
3answers
3k views

Backlight Issue - Samsung RV509 Notebook

I installed Ubuntu 12.04 today on my Samsung RV509 Notebook (Nvidia Geforce 315M) and the backlight brightness controls don't work on it. I did some digging around the web and found the samsung tools ...
2
votes
1answer
1k views

How can I permanently apply this workaround to get the backlight working on an eMachines E525?

There is a display bug that I've been trying to find information on for a while now involving the "eMachines E525 Notebook computer" and it's "backlight", when using Ubuntu, Xubuntu, Lubuntu, and ...
2
votes
2answers
2k views

Backlight not on during Ubuntu 11.10 Installation HP Folio 13

I have a HP Folio 13 B2A32UT and I am trying to install Ubuntu 11.10 64bit, But unfortunately after it shows the purple screen, with the little human and the keyboard in the bottom of the screen and ...
1
vote
1answer
981 views

Ubuntu Refuses to Change Backlight Brightness

I've attempted to change the Backlight Brightness, by both the keyboard setting and directly in the screen settings. Both show that I've changed the brightness down to minimum neither actually changed ...
1
vote
0answers
325 views

How to tell gnome which file to use to change backlight brightness? [closed]

I have a Dell Inspiron M5010 and I am unable to change my backlight brightness with the F-Keys and it also does not work with gnome brightness widget. I am able to change backlight brightness ...
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vote
1answer
565 views

Cannot start Wubi 11.10 without “nomodeset”

I am a bit of a Linux noob, so help me out a bit. I installed Ubuntu 11.10 in Wubi on my Acer Aspire 5734z laptop ([specs][1]) and when i boot, i have to use nomodeset by pressing e at bootup, or the ...
0
votes
1answer
511 views

WIll 12.04 have a keyboard backlight indicator?

I have a laptop which has a keyboard with a backlight. This works fine, brightness indicator, volume indicator, but nothing appears on for keyboard backlight. Will 12.04 eventually have a keyboard ...
1
vote
1answer
872 views

Attempting to change Keyboard Backlight levels changes theme

I'm using an Asus G74SX on Ubuntu 12.04. When I try to change my Keyboard Backlight levels my theme seems to change or crash to a backup. P.S. My Screen Brightness won't change if I use the keys or ...
8
votes
5answers
5k 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 ...
7
votes
8answers
3k 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.
3
votes
0answers
476 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 ...
10
votes
2answers
9k 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 ...