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

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No backlight on Thinkpad

I recently installed Xubuntu on a new Thinkpad T440 (dual-booting with Windows 8). All was well for about a week, then my backlight stopped working altogether (I can only see what's on the screen by ...
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8 views

Ubuntu 12.04 - backlight adjustment

I was trying to look at solutions that would enable me to adjust the backlight intensity using the function buttons. I tried editing the grub file in /etc/default/grub but that didn't help. I ...
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4 views

Debian Wheezy on Samsung NP900X3A some Fn Keys don't work [migrated]

I've gone through all questions and tutorials on how to solve this problem. They weren't meant for my Laptop version but "close enough". Unfortunately they didn't help. This is the case. # ...
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1answer
110 views

How to make suspend work without the screen staying black afterwards?

I recently installed Ubuntu 14.04 on my laptop, and whenever I try to resume my computer after suspending it, everything starts up fine except my screen, which remains black (no backlight). My laptop ...
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1answer
89 views

Backlight keyboard won't turn on samsung ativbook 6 ubuntu 14.04

So I have recently installed Ubuntu 14.04 and I like it but I can't seem to make the back-light keyboard to work. I have search hours for a solution but I can't find the script: kbd_brightness ...
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4answers
318 views

Backlight issues with Asus X551MAV-EB01-B

I've got a fresh install of trusty (xubuntu if that matters, I don't think it should) on a Asus X551MAV-EB01-B. My function keys for brightness don't work. Here's what I know so far: If I pass ...
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0answers
38 views

kubuntu : backlight problem on vostro 3555 (radeon HD 6520G)

having recurrent trouble running (k)ubuntu on a dell vostro 3555 using a radeon hd 6520g chipset, i'd solved those on 13.10, re-installing the proprietary driver (because the resume on lid open and ...
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0answers
34 views

Backlit keyboard

I have a dell vostro 3650 running newest Ubuntu install. I read this laptop has a backlit keyboard. I've researched how to turn it on with no luck. I've tried hitting the Fn F6 keys and the Fn right ...
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108 views

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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0answers
55 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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65 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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26 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
32 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
44 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
92 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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0answers
79 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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1answer
817 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
225 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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104 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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0answers
42 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
57 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
247 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
133 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
213 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
910 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
210 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
181 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
161 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
132 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
70 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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1answer
441 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
103 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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0answers
54 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
357 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 ...
3
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1answer
94 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
246 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
24 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
145 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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vote
1answer
120 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
1k 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
220 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
49 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 ...
0
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1answer
210 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
112 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
163 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
77 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
74 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
315 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 ...