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

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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
49 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
98 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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0answers
42 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
146 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
29 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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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
135 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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1answer
21 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
83 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 ...
2
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0answers
16 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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0answers
49 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 ...
0
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1answer
63 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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0answers
96 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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0answers
113 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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0answers
40 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 ...
1
vote
1answer
41 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
53 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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votes
1answer
26 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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1answer
64 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
33 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
358 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 ...
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1answer
29 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 ...
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0answers
37 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
34 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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1answer
746 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
88 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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0answers
164 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 ...
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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 ...
0
votes
1answer
99 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/* ...
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0answers
77 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 ...
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0answers
58 views

Original MacBook Air Running 14.04 Won't Turn on Backlight after waking

I have the original MacBook Air running Ubuntu 14.04 (Which is running really well, except for one thing.) I seem to have everything working, except waking the computer from a lid close. After I ...
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0answers
74 views

Changes in system screen brightness aren't reflected on actual screen. [Ubuntu 15.10][Laptop]

I've had this issue since 14.04.3 but I never bothered to fix it since I didn't use Ubuntu much. Pressing the brightness up/down function keys brings up the popup displaying the brightness level, ...
0
votes
2answers
123 views

xbacklight works, system settings don't affect

I am running Ubuntu 15.10 x64 on my Dell M4800 with the lvds connected to the Nvidia K2100M via nvidia-355, as the intel card does not support the 3K screen. So when I change the screen brightness ...
0
votes
1answer
40 views

How to switch the screen illumination off and continue typing? [duplicate]

I can switch the screen illumination manually off by pressing Fn+F6 on my laptop keyboard. This is the same as automatically switching it off on idle as it can be set in the power management. The ...
0
votes
1answer
93 views

Ubuntu brightness max_level

Notebook is Lenovo IdeaPad Z500. Ubuntu 14.04 LTS with latest updates. When I first time clicked on F12 (which change brightness up by default) light become lower, but not 0 (I see the text, but it's ...
1
vote
1answer
173 views

Brightness Control : Asus X453MA : Xubuntu 14.04

I cannot adjust the screen brightness using the Fn keys. I have scoured the net to find a solution and so far this is what I have : I've tried creating/editing ...
0
votes
0answers
42 views

Problem with backlight

I always have problems with brightness control in my computer,(I have intel graphics HD 400) Until yesterday, I was running ubuntu 15.04 without problem at all. I just have to modify grub with these ...
1
vote
0answers
72 views

Keyboard backlight keeps turning on after uprgade to Wily on Dell V131, what can be the cause? [duplicate]

I have a Dell V131 with and recently upgraded it to Ubuntu (15.10) Wily Werewolf. Now, the keyboard backlight keeps turning on. I have not seen it turn on and mostly notice when I come back to the ...
7
votes
2answers
968 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
36 views

How to install recognized backlight software on my Toshiba Tecra R850?

I'm running Ubuntu 14.04 on VirtualBox, which seems to have emulated graphics. I can adjust my brightness and have graphics drivers installed, but Calise doesn't recognise either. It wants sysfs ...
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0answers
22 views

Set monitor backlight to minimum level during ubuntu boot

Is it possible to change the default brightness level during boot to the minimum level available.
3
votes
0answers
228 views

Brightness Ubuntu vs. Kubuntu and Xubuntu

On Kubuntu and Xubuntu the brightness of my monitor goes down to zero (i.e. the backlight got switched off). On Ubuntu this does not happen, the minimux brightness is still with backlight on and ...
0
votes
1answer
49 views

Backlight does not come on after booting

I have a slightly old Gateway NV series laptop, and just installed Ubuntu 14.04 LTS because Windows was getting slow. Once it installed though, I found that the screen backlight does not come on after ...
0
votes
0answers
222 views

Samsung tools ubuntu 15.04

I know there is a samsung tools for ubuntu 14.04, but I am currently on ubuntu 15.04. Does anyone know of samsung tools working on ubuntu 15.04? I do not want to go through reintalling 14.04 for it. ...
0
votes
0answers
30 views

Ubuntu 14.04. Samsung Ativ Book 6. Brightness doesn't change [duplicate]

When I change my brightness, the slider moves, the brightness level changes, but actual brightness is the same. I have read a lot of topics about this problem. I tried to change grub, to create ...
1
vote
0answers
265 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
0answers
136 views

Brightness will not change on Ideapad p400

I recently installed Ubuntu 14 (can't remember which release) to dual boot with Windows 10 on my Lenovo IdeaPad p400 Touch. It gave me the option to upgrade to 15.04, which I decided to do. After ...
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votes
1answer
343 views

backlight trouble xubuntu lenovo ideapad 100

Brightness control is reversed. When I press the brightness control keys the increase button will make it dim and visa versa. The indicator for the brightness on display is also backwards, and before ...
2
votes
2answers
222 views

Is there an App that can make my desktop dimmer

I used an app in Windows 7, I think called dimmer to make the screen change its contrast settings so I could dim it lower than the controls of the PC defaults such as function key or the power options ...