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

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“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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31 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
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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
52 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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0answers
29 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
116 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
30 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
76 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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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
100 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
67 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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1answer
84 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
140 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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37 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
57 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
111 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
49 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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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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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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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
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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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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306 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
31 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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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 ...
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1answer
150 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
292 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
681 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
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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167 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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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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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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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 ...
0
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1answer
36 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
196 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 ...
1
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1answer
116 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
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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3answers
4k 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
315 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
166 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
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 ...
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2answers
102 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
390 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
168 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 ...
4
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1answer
332 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
2k 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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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 ...
1
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2answers
301 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
189 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
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 ...