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

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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
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3answers
40k 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 ...
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0answers
10 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] ...
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0answers
29 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 ...
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9answers
33k 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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0answers
140 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 ...
5
votes
1answer
304 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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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 ...
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1answer
370 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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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 ...
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1answer
52 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 ...
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1answer
98 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 ...
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0answers
155 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 ...
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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 ...
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1answer
81 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 ...
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2answers
840 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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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 ...
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0answers
45 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 ...
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1answer
218 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/ ...
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0answers
40 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 ...
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1answer
205 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 ...
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0answers
8 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 ...
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1answer
24 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, ...
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1answer
88 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 ...
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0answers
60 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 ...
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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 ...
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1answer
986 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 ...
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0answers
65 views

Lenovo Ideapad z500 keyboard/screen backlight issues

I cannot get my back-light on my keyboard to work whatsoever and the brightness of the screen only has two settings: maximum or eye scalding maximum. I have been searching forums high and low for ...
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0answers
142 views

brightness indicator doesn't change backlight brightness (15.10, Cinnamon, Nvidia GeForce GTX 970M)

the problem My laptop's brightness adjustment keys affect the brightness indicator, but do not affect the real brightness of the monitor's backlight. related facts My Ubuntu version is 15.10. My ...
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1answer
46 views

Display still reset to minimum after restarting in ubuntu 14.04

I already follow these instructions provided in Ubuntu StackExchange and display is still reset to minimum after restarting. 1- cat /sys/class/backlight/acpi_videoX/brightness gksu gedit ...
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0answers
46 views

No backlight after installing ati driver

I have installed amd drivers on my laptop and since I rebooted it I have no backlight. I have tried adding acpi_backlight=vendor as a kernel parameter and using xbacklight -set xx but none of this ...
0
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1answer
28 views

how to change ubuntu brightness?

i have repeatedly found it very difficult on desktops. echo 40 > /sys/class/backlight/ doesn't work as there are no backlight files. in laptop too sometimes there are not there but fn key works! so ...
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votes
1answer
2k 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 ...
0
votes
1answer
65 views

Adjust screen backlight on ancient HP, with Lubuntu 15.10

I've installed Lubuntu 15.10 on my HP nx9005 (circa 2001), and all works great except that I can find no way to adjust the backlight brightness. I've had a look at various solutions, here and ...
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0answers
39 views

Sony VAIO SVF1521 Not turn off keyboard backlight

I use ubuntu 15.10. My sony SVF1521JSTB hasn't got kbd_bakclight file in "/sys/devices/platform/sony-laptop/" path, and when I try run as root this "echo 0 | sudo tee /sys/.../kbd_backlight" command, ...
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1answer
374 views

15.10 Brightness adjustment

I have a 2015 Thinkpad X1 Carbon that I just installed Ubuntu 15.10 on. I have noticed that there is a huge jump between the minimum screen brightness, where the backlight is completely off, to the ...
0
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1answer
31 views

Laptop screen brightness change seems to affect color, not backlight

I have a problem with my laptop (Acer Aspire 5750G), I can't change the screen brightness. I noticed that the only application with which I was able to change the brightness of my laptop screen is ...
4
votes
1answer
11k views

How to use xbacklight with brightness keys in a VAIO

I have a Sony VAIO VPCCW15FL, with Ubuntu 12.04 installed. Sadly, the brightness keys do not work out of the box, although the brightness meter reacts to the brightness up/down keypresses. ...
7
votes
2answers
1k views

Dell XPS 13 9343 - keyboard backlight on at boot Ubuntu 15.10

I upgrade from Ubuntu 15.04 to Ubuntu 15.10 and now on the first boot the keyboard backlight is on. I can manually turn it off, but the setting is not remembered and the next boot results in the ...
0
votes
0answers
38 views

How to turn off keyboard backlight if keyboard is broken?

My keyboard had the backlight on when it stopped working (due to spillage) and now I can't use the Fn + space to shut it off. Are there any commands or settings I can use without using the laptop ...
0
votes
1answer
37 views

Backlight controle is not working

i recently updatet my laptop to ubuntu 15.04 and my backlightcontrole is not working with the fn keys i tried a few things but it did not worked out for me. hp pavilion dv6 01:00.0 VGA compatible ...
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votes
2answers
668 views

Backlight driver /sys/class/backlight has two entries?

System: Dell N4110 Ubuntu ver: Oneric My /sys/class/backlight has two entries acpi_video0 and intel_backlight? Is it normal to have two entries here? When I try to change the screen brightness ...
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vote
0answers
94 views

Hotkeys and slider for brightness don't work

I have an Intel processor with no graphics and Nvidia GTX980M with Nvidia driver. I just installed Ubuntu Gnome 15.10 and everything works fine except for the brightness controls. Changing both from ...
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votes
0answers
35 views

Change default brightness level in Ubuntu 14. 04 LTS / Brightness is reset to Maximum on every Restart on Ubuntu 14.04 LTS [duplicate]

Recently I was going through the link below (Brightness is reset to Maximum on every Restart) and was trying to change the default brightness level on my system as its very annoying as the default ...
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0answers
197 views

Lubuntu MacBook no screen backlight after resume/wake

I'm running Lubuntu 15.10 on a MacBook Intel Core2Duo. After suspending/hibernating and then resuming/waking the screen's backlight does not come on. With a bright enough light, one can see what the ...
2
votes
1answer
252 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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0answers
276 views

Dell XPS 13 9343 keyboard backlight

I have just re-installed 15.04 after updating my older BIOS to a newer version, prior to this re-installation the keyboard back light was functional; however, it doesn't seem to be working anymore ...
0
votes
1answer
109 views

15.10 Dell Vostro 3700 display brightness fn+key change problem

I have 15.10 default install, no any changes to /etc/default/grub. Now when I press Fn + arrowUp/Down I can see display brightness change notification. Moreover, /sys/class/backlight/acpi_video0/* ...
0
votes
2answers
716 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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0answers
86 views

Strange problem with backlight (it worked and now no more?)

EDIT : It's started working again?! i went out on friday night and i left pc ON. This morning it was working. looking in syslog i saw this : Dec 10 22:41:00 LittleHP kernel: [ 262.553256] video ...