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

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My Toshiba Satellite P855-331 PSPKFE laptop's keyboard backlight is not working under Ubuntu 14.04

My Toshiba Satellite P855-331 PSPKFE backlit keyboard not working under Ubuntu 14.04. In BIOS and bootup it works but after Ubuntu boots, it is not working anymore. I have read similar threads of ...
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19 views

Xubuntu - How do I map the brightness keys to run a script?

I'm pretty new to Linux so bear with me. I have an emachines laptop (ugh) with FN + Left Arr / Right Arr brightness keys. These work perfectly fine in Windows but do not work in Xubuntu. What happens ...
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16 views

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

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. ...
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16 views

Keyboard Backlight Software [Novatech N1716]

I have a Novatech N1716 laptop: http://www.novatech.co.uk/products/laptops/n1716.html it comes with a windows driver disk (who would have thought), and now that I have switched to linux, I was ...
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1answer
22 views

Nvidia 410m - No backlight

I've been running Ubuntu 14.04 on my laptop, a Sony Vaio VCGEP33F, but a few days ago I began using Nvidia drivers (331.79) This laptop also has an Intel integrated GPU, but I have disabled it in the ...
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0answers
26 views

Any way to enable dynamic/automatic brightness adjustment?

My Lenovo ThinkPad X201 Tablet has a very bright screen (400 nits!), which is good for when objects on the screen are dark (say a night scene in a movie), but it is of course very blinding when ...
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1answer
71 views

Preserve screen backlight intensity over sleep

I am running Kubuntu 14.04 on my MacBook Pro Retina 13" (MacBookPro10,2) with integrated Intel graphics, and no other graphics chips. Currently, when I put my machine to sleep and later wake it up ...
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54 views

Keyboard Backlight not working

I'm using Ubuntu 12.04 on a Toshiba Satellite P775-S7100. The keyboard backlight was working initially, but after reinstalling the same version of Ubuntu it stopped working, and as far as I can tell, ...
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2answers
284 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 ...
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1answer
181 views

Brightness keys no longer work

My Fn+F8 and Fn+F9 keys to change the screen's brightness appear to no longer work on my Thinkpad laptop. # ls /sys/class/backlight/ thinkpad_screen Some guide told me to make this: # cat ...
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72 views

Keyboard backlight only stays on in a light environment

So on my ASUS laptop (Q501LA), I can adjust the keyboard backlight with the hotkeys just fine, but the backlight seems to behave opposite to what you would expect - in a dark environment (like a room ...
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33 views

samsung np350u2b screen brightness out of control after 14.04 do-release-upgrade

I have upgraded 13.10 to 14.04 on my samsung np350u2b notebook. everything works fine except that when I put the notebook into standby then powerup again, screen backlight becomes darker and I cannot ...
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1answer
49 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 ...
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1answer
138 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
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1answer
102 views

Pixel Qi screen on ubuntu

I just installed Pixel Qi screen (PQ101WX01), but I can only control dimming of the screen. It doesn't become more readable in the sunlight. And if I go to sleep, screen becomes completely black. How ...
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1answer
167 views

How to recognize backlit of an Asus UX31E keyboard?

I replaced the keyboard in my Asus UX31E with one from later UX31A. The only technical difference between the two is that the latter has keyboard backlight and uses Fn + F3 / F4 for this. However, I ...
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4answers
521 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 ...
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0answers
120 views

Backlight button not working ( Dell inspiron 14z) - 14.04

The main point is that everything was working on 12.04 but now I can only change brightness using the applet. Here's what I have done so far: Following the info provided on Ubuntu Wiki Backlight I ...
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2answers
131 views

Brightness controls mismatch

This seems to be a hardware issue rather than a Ubuntu issue, but nevertheless, here goes. I have an Acer ao756-2617 with Ubuntu 14.04, elementary os luna, bodhi linux, and zorin os 8. most of these ...
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1answer
147 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 ...
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0answers
88 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
51 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
292 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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1answer
91 views

Suspend not working due to backlight issue

I am using the Radeon HD 6320 video card with the radeon xorg driver. I have tried using the flgrx dirver but it isn't as snappy as the xorg and also has brightness issues. The xorg driver has ...
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43 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 ...
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0answers
264 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 ...
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1answer
91 views

How to find backlight is managed by which card?

Is there any command in ubuntu/linux which can help me in finding out that which card(intel or ATI card) is managing my backlight? When I looked at sys/class/backlight then I am able to find three ...
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0answers
165 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
23 views

backlight on laptop

My laptops backlight adjustment keys don't work on 13.10 and the "brightness and lock" ui doesn't work. I think it may have worked before installing nvidia drivers, but I don't remember. I've ...
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2answers
107 views

How to fix backlight for Dell inspiron on ubuntu 12.0.4 LTS?

I work on a Dell Inspiron laptop. The backlight is not working on Ubuntu. Is there any known issues like this with Ubuntu on Dell machines? I've tried some solutions such as changing grub like the ...
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0answers
36 views

Ubuntu 12.04 boots to blank screen without backlight after upgrade on ASUS A72J [duplicate]

I had a working version of Ubuntu 12.04 in dual boot with Windows 7 on my ASUS A72J. However, after installing the last ~350 upgrades (I had not used Ubuntu in a long time) using the normal updating ...
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1answer
105 views

Keyboard backlight

I have a Samsung Series 7 NP700Z5AH with keyboard backlight. After Ubuntu install it doesnt work, is it possible to fix? There was a "Fucntion" shortcut for the sharpness of the light FN+F9/F10.
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1answer
653 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 ...
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0answers
205 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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0answers
47 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
164 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 ...
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1answer
103 views

no display backlight after boot on my notebook

i insttalled ubuntu 13.10 on my COMPAQ PRESARIO CQ-41 209TU notebook.but whenever it comes on login screen, display backlight turns to 0.why?please help me.
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1answer
147 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 ...
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0answers
76 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 ...
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1answer
59 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 ...
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2answers
269 views

Toshiba T110 brightness control “FN” doesn't work (Ubuntu 12.04 LTS 32 bit)

I recently installed Ubuntu 12.04 32 bit in my Toshiba T110 laptop, and the brightness control doesn't work. I have tried gedit /etc/default/grub, and have modified the "quite splash" to many ...
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0answers
14 views

Black screen on boot (no backlight) [duplicate]

So after grub .screen my computer screen turns black. i can fix it by increasing brightness with F3-key but is there any way to make it boot with full backlight? My kernel parameters are: quiet ...
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0answers
517 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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0answers
38 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 ...
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1answer
133 views

How can I force the backlight to never turn off?

I'm using Ubuntu 13.10 with GNOME 3.10 on a Packard Bell EasyNote-TK37 (Intel GM45 Express graphics), and I've had significant problems with my backlight. Initially, upon booting the backlight would ...
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0answers
156 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
2answers
4k 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 ...
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1answer
2k views

Xubuntu 13.10 Screen Brightness Fn Keys

I have a Samsung Series 9 NP900X3C, which has a Intel HD Graphics 4000 chip. When I use the the Fn keys for changing the brightness, it shows me a nice OSD and sets the value in ...
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2answers
751 views

Keyboard backlight function keys for Samsung Series 9 np900x3d and Ubuntu 13.10

I purchased a new Samsung New Series 9 NP900X3D and installed Ubuntu 13.10 tonight. The keyboard illumination function keys do not work. I've read on https://help.ubuntu.com/community/SamsungSeries9 ...
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0answers
401 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 ...