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

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1answer
13 views

Help! No brightness slider in the settings (ubuntu 16.04 desktop with nvidia GTX960)

Just installed Ubuntu 16.04 on my system(cpu:amd fx 6300),there is no setting to change the screen brightness.earlier i was using deepin os 15.2 and the brightness slider worked perfectly. I have ...
0
votes
1answer
16 views

Enable backlight on ASUS ROG G551JX

Recently dual booted UBUNTU 16.04 with pre installed windows 8.1 on my ASUS ROG G551JX. Backlight in the keyboard works perfectly when I log into widows but gets disabled as soon as I switch to UBUNTU,...
0
votes
1answer
38 views

Changing Screen Brightness Through Keyboard Functions on My Notebook

I've installed Ubuntu 16.04 on my Asus X555LJ. But I don't know how to install drivers or how to enable function keys to controls screen backlight brightness.
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0answers
43 views

Problem adjusting the brightness

I'm fairly new to Ubuntu and I've managed to take care of almost everything but brightness. Right from the begining, brightness is at its peak and it's hurting my eyes by now and I have no obvious way ...
3
votes
5answers
5k 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 ...
0
votes
0answers
19 views

No video after bootloader on Sony Vaio SVF15N2A4E

I have a Sony Vaio SVF15NA24E. I have been trying to get Ubuntu 16.04 installed on it alongside Windows 8.1, which works fine. However, the screen simply blanks out after the grub bootloader when ...
3
votes
1answer
66 views

Backlight too low on Ubuntu 16.04 (Lenovo Laptop)

I can't get the brightness control to work properly on my Ubuntu 16.04 installation. My laptop screen appears really dark, but my second monitor works well. I've already tried a lot of alternatives (...
11
votes
5answers
22k views

I cannot change the screen brightness

here's my problem: Ever since I installed Ubuntu 12.10 on my computer I haven't been able to change the screen brightness, it was always set to the maximum. I did take a look at this post: Decrease ...
0
votes
1answer
59 views

I can't set the brightness of my system

Afetr some updates of my system Ubuntu 16.04 LTS; the brightness is higher, I'haven't possibility to set it, It doesn't appear on power manager. I've installed xbacklight and set this configuration ...
1
vote
0answers
25 views

Laptop brightness resets on opening lid?

So I just installed Ubuntu 16.04 on my laptop(fresh install) and am having an issue I did not have in Ubuntu 15.10. So I have set the When the lid is closed to Do Nothing as I don't want my laptop to ...
2
votes
0answers
23 views

Function keys change wrong backlight file on my Acer Aspire One

Whenever I press the function keys to change my laptop's screen brightness, it modifies the value stored in the file /sys/class/backlight/acer-wmi/brightness, but my screen stays the same. With a bit ...
1
vote
1answer
169 views

How to configure the triggers for my laptop's keyboard backlight?

I want my keyboard backlight to be generally disabled and glow only when I do a manual Fn-key toggle. The problem is that I can not find a way to edit the files - trigger and start_triggers in /sys/...
0
votes
0answers
20 views

How to activate keyboard backlight from command-line? [duplicate]

using ubuntu 16 on a crappy sony vaio laptop. the keyboard backlight works fine until i put the laptop to sleep. upon waking the laptop the keyboard backlights remain off. there are no function keys ...
0
votes
0answers
33 views

How to change intel backlight to acpi_video?

In my ubuntu I can't change my brightness through nor through system setting. I found that brightness is controlled by intel card rather than acpi. Meaning in folder /sys/class/backlight I have two ...
0
votes
0answers
55 views

“Cannot find a backlight controller” when normally booting Ubuntu 16.04 LTS on a Pavilion g6 Notebook

Most if not all Ubuntu backlight solutions depend on the backlight driver working. Like this one for example. In my case, when normally booting Ubuntu 16.04 LTS on a Hewlett-Packard Pavilion g6 ...
0
votes
0answers
55 views

xbacklight - No outputs have backlight property

I am running Lubuntu 16.04 Attempting to run xbacklight -get gives me No outputs have backlight property There is only one directory in /sys/class/backlight, which is intel_backlight. I have ...
0
votes
1answer
4k 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 ...
0
votes
2answers
204 views

Backlight won't turn on after suspend on Macbook air (Early 2015)

After suspending my macbook by closing the lid the backlight will not turn back on however the rest of Ubuntu resumes normally. The screen brightness setting also has no effect on the screen ...
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vote
2answers
6k views

No back light on my Acer Aspire 5734z

I installed Ubuntu (12.04) on my Acer Aspire 5734z and the back light stopped working. I have tried the fix by editing the grub file posted on here a couple of days ago but that hasn't fixed it. I ...
1
vote
0answers
54 views

thinkpad_acpi disabling brightness events

After installing routine updates, my keyboard brightness controls, wireless on/off, and other controls have stopped working. Interestingly, the 'lock' key still works. I have looked at a few other ...
0
votes
1answer
122 views

Brightness Does not work at all Samsung ultra book intel backlight

I have a problem with my 530U4E/540U4E Samsung Ultrabook Backlight settings; the system doesn't seem detect the change in brightness settings. To fix it I tried the "Intel backlight Fix" because my ...
0
votes
0answers
43 views

brightness key not working after kernel update on thinkpad yoga

Used to work well under 3.13 kernel. After updating to 3.19.0-32, brightness control keys don't work. When pressed, the slider shows up with correct brightness level, but can't change the brightness ...
0
votes
1answer
99 views

hp star wars laptop keyboard backlight control, & screen brightness

I've just installed 16.04 on a new HP star wars laptop (a reskin of an HP pavillion I believe), but xset led 3 doesn't turn on the keyboard backlight. Also there is no brightness slider or other ...
0
votes
2answers
35 views

Laptop screen dimming after (? random) period 14.04

We have a Lenovo X220 and an X230 both running Ubuntu 14.04. Intermittently, and for no obvious reason, after opening the lid and resuming, for which we require passwords, the backlight will dim to ...
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votes
2answers
1k 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 ...
0
votes
1answer
91 views

How to make my Toshiba u940 laptop's keyboard backlit to work?

I am using the latest Xubuntu x64 version as of this posting.. It's installed in dual boot with Windows 10.. the KB Backlight is working when I boot on Windows and from the bios.. The moment It enters ...
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votes
1answer
96 views

Dim screen light even though I have brightness on high

So I currently am using Ubuntu 16.04 LTS and the brightness button registers my screen brightness on high, however, the actual brightness that I see is the lowest. I've tried using terminal codes to ...
0
votes
0answers
71 views

Nvidia backlight/login screen/external display issue

I`m combining this three issues becauese they are probably connected with each other. 1. Backlight is not natively supported. In order to set backlight using function key on keyboard I have to add ...
10
votes
3answers
43k 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 ...
0
votes
0answers
66 views

gsd-backlight-helper spamming the log after upgrade to 16.04?

Since updating to 16.04 from 14.04, I have the syslog spammed by: SEC: May 22 13:26:43 samsung-romano pkexec[21248]: gdm: Error executing command as another user: Not authorized [USER=root] [TTY=...
0
votes
0answers
54 views

Acer TravelMate P238-M Backlit keyboard Ubuntu 16.04 LTS

recently I got Acer TravelMate P238-M with the following hardware: Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz 16GB RAM 256GB SSD 13,3" FHD Display Everything is working out of the box, except the ...
12
votes
9answers
38k 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 ...
4
votes
1answer
328 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 ...
1
vote
1answer
376 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 ...
0
votes
1answer
66 views

How to link the system event brightness up/down to the correct brightness file

I have a ASUS UL30VT and just installed Ubuntu 14.04 LTS. The screen brightness was at level 0. Attempt 1: so I navigated to find the screen brightness slider under System Settings>Brightness&...
0
votes
1answer
146 views

Dell Precision M4500 laptop Keyboard backlight issues

While running (or more specifically loading ubuntu 16.04) ubuntu sets my keyboard backlight to off (brightness, not on/off, but lowest possible brightness). I setup Windows 7 (since it actually has ...
2
votes
0answers
309 views

I can't lower the backlight/brightness

Why I can't control the brightness/backlight level? At the first: Notebook Positivo BGH - C500 Series. Processor: AMD C60 series (dual core 800 mhz-1ghz) GPU: Radeon HD 6290 (worked with fglrx/...
0
votes
1answer
114 views

MSI keyboard backlight

I have tried to get my backlight on my MSI Steel Series keyboard to work. But I get an error message. Here is what I've done: Install nodejs: curl -sL https://deb.nodesource.com/setup_5.x | sudo -E ...
1
vote
2answers
879 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
6
votes
3answers
2k 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 ...
0
votes
0answers
47 views

The backlight brightness always set to full after I turn on my laptop

I have checked the number in /sys/class/backlight/acpi_video0/device/backlight/acpi_video0/brightness is 2, but it always set to full after I install the Nvidia driver, I have to manually adjust it ...
2
votes
1answer
356 views

Turn off keyboard backlight, Asus laptop (Ubuntu 15.10)

When I boot up my laptop (Asus K501UX) keyboard backlight is turned on automatically. I want to turn it off by default, when Ubuntu is loaded, without using any hot keys. sudo find /sys/class/leds/ ...
0
votes
0answers
44 views

Brightness not working on Lenovo Ideapad Z580 with Ubuntu 15.10

Recently upgraded from 14.04 to 15.10 Brightness control keys worked fine in 14.04 In 15.10 when pressing brightness increase or decrease keys, the screen slider pops up, but the brightness does not ...
0
votes
1answer
317 views

Disable keyboard backlight and Bluetooth at startup in Ubuntu mate 15.10

I searched a lot for an answer for this question. Most of the answers that I find is to include the commands to disable the respective devices using the rc.local file. I tried this method but ...
0
votes
0answers
12 views

Keyboard flashing instead of dimming

So, I have an ASUS N56VB with ubuntu 15.10 and I encountered a problem a few days ago, my keyboard backlighting that was previously working fine now doesn't respond properly to the bright levels, it ...
0
votes
1answer
28 views

CF-52 Mk 1 brightness stops at 50%

I used the acpi_osi= trick to make Xubuntu 14.04 work with my newly acquired CF-52 Mk 1 Toughbook. Among other things, this enabled it to control the LCD backlight brightness. This mostly works fine, ...
4
votes
1answer
90 views

Brightness control is blocked after reaching minimum

Several days ago I tried to fix a quite popular problem. I have Ubuntu 15.10. In my computer the brightness control keys weren't working. I have added a file /usr/share/X11/xorg.conf.d/20-intel.conf ...
0
votes
0answers
63 views

Cannot adjust brightness on Samsung NP370R5E-A06UK running Ubuntu 15.04

The issue is in the title. I have tried this as well as the top answer here, both achieved nothing. I should note however, that if I start up (or wake up from sleep) while not plugged in, I will get ...
2
votes
0answers
17 views

Brightness Problem Ubuntu 15.10 (Dell inspiron 5737) [duplicate]

i need help how to fix my laptop Dell Inspiron 5737 brightness being stuck at max, when i press keys on my laptop scale shows that it "works" but brightness remain the same at max and it is killing me ...
0
votes
1answer
2k views

xbacklight: No outputs have backlight property - No /sys/class/backlight folder

I installed xbacklight, hoping that it would be able to control my brightness. When trying to change brightness, I was told "No outputs have backlight property". After looking around, I found that ...