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

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841 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
537 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.
2
votes
1answer
976 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
965 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
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 ...
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vote
1answer
456 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
438 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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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?) ...
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vote
1answer
862 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 ...
0
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1answer
43 views

Brightness Save on Reboot

I have a problem where the brightness does not save after a reboot on 14.04 LTS, but I had the same problem on 12.04 LTS (before I broke the system). Before you say this is a duplicate of a million ...
0
votes
1answer
183 views

Toshiba Satellite P755-S5269 keyboard backlight doesn't work

I'm new to Ubuntu and I have a problem with the keyboard backlight on my laptop. I was looking for solutions on the web but unfortunately I could not find anything specific. My laptop model is ...
0
votes
1answer
100 views

How can control my brightness of the display on hp nseries laptop

I just bought a new laptop and i have installed windows 8 and ubuntu 12.04 on it. And while using ubuntu i am not able to control my brightness with the dedicated keys or the softwares such as ...
0
votes
1answer
40 views

Blender causes my screen backlights to flicker

I am using a desktop with a Radeon HD 5xxx CGU. Every time I work with Blender (no matter the version), my screen flickers at what seems to be random times (meaning I don't feel I am doing anything ...
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 > ...
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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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0answers
34 views

Key Repeat functionality doesn't work on certain keys (Ubuntu 12.04)

I'm running Ubuntu 12.04 on a Macbook Pro and key repeat (when I hold down a key) is not working for any of the brightness buttons (keyboard backlight and screen brightness). Is there any way to ...
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0answers
482 views

No laptop backlight when using AMD driver recommended by Steam

When I install the fglrx-experimental-13 driver that Steam recommends for my laptop (ATI Mobility Radeon HD 5000 Series) I have no backlight when I log in, but an external monitor works. I've tried a ...
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0answers
87 views

Turning Backlight on on external Monitor

I have a lenovo laptop running xubuntu smoothly. I plugged in a dvi monitor with a hdmi to dvi wire. The display works perfectly for two seconds then the backlight turns off. I cant find a way to ...
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0answers
74 views

VLC does not prevent backlight from turning off on battery

On Kubuntu 12.04 i have noticed that VLC does not prevent my backlight from dimming when watching a movie in fullscreen on battery. I have the following enabled in the advanced preferences: Inhibit ...
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0answers
170 views

How do I turn off the display (DPMS) without X?

I've been trying to switch off the built-in screen of a device I've got, but I can't seem to completely control it without X running. If I run a GUI (I've tried Kubuntu 12.10) and issue the command ...
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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 ...
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0answers
233 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 ...
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0answers
281 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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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 ...
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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 ...
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0answers
23 views

System crash: empty /sys/class/backlight (deleted acpi_video0) & now the error “disk drive is not ready yet or present”

I "tried" to set the default brightness for Ubuntu 14.04. Following here, At first I did: echo 5 > /sys/class/backlight/acpi_video0/brightness then: sudo apt-get install xbacklight then ...
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0answers
9 views

Keyboard Backlight Samsung Ativ 6

I have a Samsung Ativ 6, it's my first notebook, and I'm new with Ubuntu and having some problems ;P My keyboard backlight doesn't work, I've already made a big search and couldn't solve the problem. ...
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0answers
55 views

Time to dim the screen in Ubuntu 14.04

Ok so it seems that the key in org.gnome.settings-daemon.plugins.power idle-dim-time is gone in the new Ubuntu version. Since the old method Increase screen idle dim timeout doesn't work anymore are ...
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0answers
19 views

Turn on ThinkLight?

I have an old Lenovo ThinkPad R61. It is fully loaded and it has the the ThinkLight option. For me to be able to turn it on and do other things like adjust the brightness, I have to use the blue ...
0
votes
0answers
69 views

Touchpad/Backlight keys on Asus Transformer T300LA

I have Asus Transformer book T300. Almost all my hardware working perfectly on Ubuntu 13.10/14.04 Beta but my touchpad defined as Mouse and gestures not working :( I need this option. Touchpad ...
0
votes
0answers
68 views

Can't adjust screen brightness on lenova y410p

Can't adjust screen brightness on lenova y410p. I'm running unbutu 13.10. I tried different answers on here but nothing seems to work. I changed GRUB_CMDLINE_LINUX in /etc/default/grub to include ...
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0answers
144 views

Samsung NP900X3G issues on Ubuntu 12.04 ( keyboard backlight, multitouch…)

I recently got the newest member of the Samsung Ativ Book 9 Family NP900X3G and I'm having the same issues that have been reported for the previous models but none of the fixes worked for me. ...
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votes
0answers
106 views

How do I adjust screen brightness / backight on a Toshiba Satellite C50D?

I know this is a known bug, it been asked and answered thousands of times before. I've spent the past couple of months searching for a solution and all have failed. My Fn keys won't adjust brightness ...
0
votes
0answers
73 views

Which program handles the screen backlight in 13.10?

What is the name of the program that handles the screen backlight in laptops in 13.10? Where are the settings for that program? I need to switch the brightness file that it uses. I have 3 brightness ...
0
votes
0answers
323 views

Backlight Controls Acer Aspire v5-572G

I know there are already a lot of similar questions regarding issues with no back light control with Acer models. I'm not having that issue anymore I followed the necessary changes needed in ...
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votes
0answers
32 views

Screen flashes back and forth between black and lit screen, not at boot, totally random

Currently using HP/Compaq 6220 laptop with 12.04 lts installed. Sometimes after the system warms up and is running, it will randomly flash the screen to black, back to the screen, back to black, and ...
0
votes
0answers
325 views

Turning off keyboard backlight not working in my sony vaio e series

I'm new to Ubuntu. I tried with many solutions i found in askUbuntu to turn off backlight in terminal, but it is asking password.Now the problem arises, even though i am entering the password the ...
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votes
0answers
122 views

Keyboard backlight problem on asus ux32vd

I have running Ubuntu 12.04 with kernel 3.8 I have tried many suggestions, although, the backlight is still not working. If I try to use the most simple solution: echo | sudo tee ...
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votes
0answers
394 views

Can't turn off backlight/display - 13.10 / iMac

I can find no way to completely turn off the display on a late 2013 iMac running 13.10 (Saucy). In the power management settings, I configured the display to "turn off" after one minute to see what ...
0
votes
0answers
2k views

Keyboard backlight won't work on my Samsung series 9

I got a Samsung Series 9 NP900X3E laptop, running Ubuntu 12.04 When I press Fn + F10, the keyboard backlight won't turn on. In the upper right corner, I can see that it recognizes it (with the ...
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votes
0answers
50 views

Backlight turns on by itself ASUS laptop

Every time I let my computer sit open while I do other things that require my attention I turn my backlight all the way down. For absolutely no reason Ubuntu likes to turn my backlight all the way up ...
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votes
0answers
253 views

Brightness minimum level turns backlight off

I have an Acer Aspire S3-391 ultrabook. It's Sandy Bridge i3-2377M CPU with appropriate integrated graphics. 320GB hard drive with 20GB cache SSD. I have Windows installed on the hard drive and Ubuntu ...
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votes
0answers
311 views

FN brightness keys only has 3 steps on laptop with nVidia Optimus

First, I'm a noob at linux. I've tried about everything to fix this but nothing seems to work. My FN keys for the backlight only has 3 steps - either its maximum, medium or minumum. ls ...
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votes
0answers
186 views

How to enable backlit keyboard on a Dell Latitude M4500?

Basically the question in in the title: how can I enable the backlight keyboard on a Dell Latitude M4500?
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votes
0answers
416 views

Unable to adjust backlight on Asus UL30vt neither with fn keys nor with xbacklight -set

I recently installed ubuntu 13.04 (kernel 3.8.0.y) on an older Asus UL30vt laptop. This is a switchable graphics (optimus) laptop with a intel onboard graphics card and an Nvidia Geforce G210M. I am ...
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0answers
89 views

display-backlight doesnt lights up when i start my hp g62

Hey there :) when I start my hp G62 the display brightness is off and I have to take a lamp or a flashlight to see something on the screen and then I manually turn on the brightness of the display. ...
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0answers
139 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 ...
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votes
0answers
120 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 ...
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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 ...
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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 ...