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

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17 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 ...
0
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0answers
16 views

How to activate keyboard backlight from command-line?

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
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0answers
16 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
19 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
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0answers
28 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 ...
1
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0answers
38 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
0answers
33 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
61 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
29 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 ...
0
votes
1answer
68 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
65 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
2answers
108 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 ...
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0answers
66 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 ...
0
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0answers
40 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=...
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0answers
48 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 ...
0
votes
1answer
59 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
131 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
248 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
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
299 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
43 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
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 ...
0
votes
1answer
278 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
1answer
26 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 ...
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
0answers
79 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
votes
1answer
108 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 ...
0
votes
2answers
182 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 ...
0
votes
0answers
171 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 ...
0
votes
0answers
54 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
48 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 /etc/init/...
0
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0answers
62 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 ...
0
votes
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 ...
0
votes
1answer
71 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 ...
0
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0answers
45 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, ...
0
votes
1answer
385 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
votes
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 ...
0
votes
0answers
41 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
38 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 ...
0
votes
1answer
1k 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 ...
1
vote
0answers
100 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 ...
1
vote
0answers
226 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 ...
0
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 ...
0
votes
1answer
111 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
0answers
87 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 ...
0
votes
0answers
63 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 ...
0
votes
0answers
78 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
134 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
43 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 ...