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

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How to increase Kubuntu 14.04 brightness range?

Hold your horses!. If you are hurrying to flag this as a duplicate of this question or this question, none of those have an answer to what is asked here. Thanks for the attention though. In ...
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Brightness resets after changing it manually

Every time I use the shortcut keys or xbacklight to change my screen brightness, it reverts a second later to no backlight. For example, I run xbacklight -set 50 and the screen brightens for a second ...
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1answer
55 views

No keyboard backlighting

I have bought an MS-industral Fusion keyboard.The keyboard supports backlighting and I have tested it on my friends Windows 7 and it worked.I am using Ubuntu 14.10 and backlighting does not work.All ...
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1answer
25 views

How can I keep my backlight from turning off on my Lenovo G50-30 laptop?

How would I keep the screen backlight from going out after a very short time? My laptop is the Lenovo G50-30 and this is causing me issues with this happening all the time. Could you please assist me ...
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1answer
74 views

Laptop brightness too low on Ubuntu 14.10

recently I switched to Ubuntu Gnome 14.10 64 bits on my laptop and I'm having some issues with the brightness. At first I couldn't change with the hotkeys, but I have already fixed it. The problem now ...
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74 views

Lowest brightness setting turns backlights off

I am running Ubuntu 14.10 on a Laptop. When I turn my brightness to the lowest setting it actually turns my backlights off and my entire screen goes black as if my computer was turned off. I have ...
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0answers
27 views

keyboard backlight is not working

I have just bought a new computer and I installed ubuntu on it but the problem is that I've lost my keyboard backlight here is my computer ...
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1answer
52 views

Ubuntu in VMware 11 and Cooler Master LED keyboard

I just want to try Ubuntu Linux. Basically Linux for learning purpose. And that's the reason I have installed Ubuntu 14.04 LTS (Trusty Tahr) x86 on my VMware 11. The problem is this: I am using ...
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114 views

“monitor brightness down” key resets brightness before lowering it

My monitor brightness down key resets my brightness before lowering it, effectively leaving me at near max brightness. I do not experience any problems with the brightness up key. I'm using a Dell ...
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72 views

change screen brightness

I've got a strange situation and I'm hoping someone can shed a light on it. I re-installed my dell laptop (and switched from unity to gnome) today and (as expected) dimming my screen didn't work. So I ...
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1answer
43 views

Backlight issue on dell xps

I just installed Ubuntu on my dell XPS and everything seems to work fine but the backlight that is constantly turn off. I've tried several options read through previous posts but none of those ...
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1answer
136 views

Assigning a default Keyboard backlight

I have installed UBUNTU 14.04 on an Asus G56JK laptop with keyboard backlight. The keyboard backlight control function keys are working properly, allowing four levels of brightness from 0 (no light) ...
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68 views

SONY VAIO Turn off backlight, locked windows partition, need help downloading java SEMIDUPLICATE SOS STAT

Sony Vaio SVF15N17CXB Turn off keyboard back-light Sony (VAIO SVF1521DCXW) Hello all, Total newbie, tried to dualboot but ubuntu locked up my windows partition, my windows is locked and i need 10 ...
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1answer
194 views

Brightness keys not working and no obvious interface for adjustment either

New to Ubuntu and so far pretty happy with it but one niggle is the brightness controls do not seem to work. I have looked at fixes on here + google but nothing seems to get it right. Mostly effecting ...
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1answer
67 views

How to do monitor brightness changes on the desktop like on the laptop?

On a laptop you usually have working keys for changing the backlight and you see OSD notifications while changing them. How to patch this up for “normal” desktops? How to get parts of this going?
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1answer
140 views

Can not change backlight brightness on samsung laptop

Whenever I try to change the backlight brightness with the fn+f1 or fn+f2 keys, the gui does show that the brightness is being adjusted. However the actual brightness stays the same, until I get to ...
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1answer
43 views

Lower Minimum Screen Brightness

By using /sys/class/backlight/ the screen brightness can go lower than when using the function keys to do so. Is there a way to change the minimum level used by the function key method, rather than ...
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238 views

Backlight change with FN keys do not work on Asus

I know this was asked many times but I do not understand how there is no real solution. I hop e someone can help. The problem: Asus g53 laptop, Ubuntu 14.04, KDE 4.13.3 Fn + f5-f6 should change the ...
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176 views

How to enable ambient light sensor function key on HP Elitebook 8460p?

The ambient light sensor is not enabled by default, but even when enabled, the function key does nothing. Is there a way to fix this so that the key turns it on and off?
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2answers
133 views

Lenovo Thinkpad L Brightness Level Intervals

I'm using Ubuntu 14.04. Everything worked out of the box on my L440. The only thing that bothered me was the brightness levels. I can change it by pressing fn + F5 or F6, but there are only a total of ...
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1answer
437 views

GT70 2PE Dominator Pro (or equal) keyboard backlight

Just installed Ubuntu 14.04 on my laptop and have been searching the internet for a couple of hours, trying to get my keyboard's backlight to work . I know it works out of the box when you hit the ...
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53 views

Ubuntu isn't able to boot: Keyboard backlight function in Sony vaio

I have installed Ubuntu 12.04.5 alongside with Windows 7 and it's been working fine until yesterday. After choosing Ubuntu from the dual boot menu a message appears and says: "Sony Vaio: couldn't set ...
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83 views

Acer Aspire 4820t brightness fn-keys skip steps

My acer adjusts brightness 3 steps at a time. I've used solutions from: Why does my Thinkpad brightness control skip steps? I've disabled the video driver from adjusting brightness: sudo sh -c 'echo ...
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2answers
162 views

sudo is denied access to change keyboard backlight?

Opening vim as sudo -i or sudo - still doesn't let me write to the file. Trying to change the keyboard backlight settings on my laptop gives me this output; even with sudo I can't change anything in ...
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1answer
57 views

Where is the laptop brightness script located?

Online I found the command: echo 1 > /sys/class/backlight/acpi_video0/brightness to set my screen brightness to the lowest possible value, currently I am grepping my entire disk for that path, ...
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88 views

Apple Cinema LED Display: using regular brightness controls?

I have a Dell Latitude E6430 laptop, running Ubuntu 14.04, connected to a 27" Apple Cinema LED Display (which works fine). By tweaking the appledisplay kernel module a little bit, I can even get ...
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48 views

I can not install windown back. I get error message “cannot find backlight controller” “Support for cores revisions 0x17 and 0x18 disabled by module”

I tried to install ubuntu to my win8 pre installed computer and I am new at ubuntu so I chose lvm option while installing. and now ubuntu deleted all data about win8 and does not let me install ...
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1answer
184 views

Disable brightness and keyboard back-light at start-up?

I'm new with Linux and I have an issue that I have being researching and have not been able to find a solution so far. I was wondering if any help can be given. I have an Asus Q500A with Win-8 and ...
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0answers
196 views

Ubuntu 14.04.1: Brillo de pantalla/ Backlight: HP Pavilion 14-v003la

no puedo cambiar el brillo de pantalla de mi Notebook HP con las teclas F2 y F3, Ubuntu me las reconoce, pero a la hora de presionarlas no cambia el brillo. Estas son las especificaciones del mi lap: ...
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61 views

How to use Fn+F5/F6 adjust the backlight

My NB is Asus N500JK and OS is Kubuntu 14.04. I try modify /etc/default/grub file. GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" then update-grub After reboot, it can use Fn+F5/F6 adjust ...
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418 views

Brightness control issue - /sys/class/backlight empty

My laptop has Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz, 4G RAM, Haswell-ULT Integrated Graphics Controller Only thing unusual is when I installed Ubuntu 14.04 LTS, I edited grub as ...
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38 views

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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0answers
41 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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1answer
179 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
379 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
876 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
62 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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0answers
178 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
108 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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0answers
133 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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0answers
50 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
41 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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1answer
283 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
131 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
178 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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4answers
7k 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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2answers
359 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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0answers
190 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
68 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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2answers
139 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 ...