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

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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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1answer
195 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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vote
1answer
389 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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0answers
2k 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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0answers
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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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
28 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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0answers
36 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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0answers
114 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
54 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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0answers
158 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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0answers
271 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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0answers
448 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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0answers
55 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
765 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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vote
0answers
577 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
496 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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0answers
134 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
93 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
301 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
88 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
249 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
312 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
24 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'm using a Dell XPS 15 laptop with an NVIDIA gpu and I added ...
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0answers
23 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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0answers
30 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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0answers
96 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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0answers
63 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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0answers
55 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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0answers
52 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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0answers
41 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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0answers
148 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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0answers
304 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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0answers
30 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 ...
0
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0answers
39 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 ...
0
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0answers
56 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
166 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
98 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
119 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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votes
0answers
41 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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votes
0answers
165 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 ...
0
votes
0answers
61 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 ...
0
votes
0answers
191 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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votes
0answers
91 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
72 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
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0answers
324 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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votes
0answers
27 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 ...
0
votes
0answers
249 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. ...
0
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0answers
79 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
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0answers
347 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 ...