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Questions tagged [backlight]

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

Kernel team backlight debugging page:

464 questions
224
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18 answers

How to change LCD brightness from command line (or via script)?

To work around bug #1005495 (changing LCD brightness via hotkeys impossible), I'd like to have one command line query for increasing and one for reducing the brightness of my LCD. I could then map a hotkey to each one of this queries. The problem…
user69748
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49
votes
10 answers

Decrease Backlight Below Minimum

I have this laptop that doesn't handle the backlight very well. In /etc/default/grub, I have added a acpi_backlight=vendor function to get it to work at all. Which is cool, and the backlight now actually works, but the minimum backlight setting is…
Ruben Bakker
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47
votes
7 answers

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 this has to do with my computer not having a…
Carter Roeser
  • 513
39
votes
5 answers

How do I set default display brightness?

Is it possible to set the default display brightness so you don't have to re-adjust it everytime you reboot? My laptop display is killing my eyes at the login screen already because it starts at 100% brightness every time.
Jeremy
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34
votes
20 answers

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 shown below Boot with kernel option…
Lespaul86
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27
votes
5 answers

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 burning sun screen brightness and the keyboard…
Redsandro
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27
votes
17 answers

How to increase brightness in smaller steps?

Is there a way to adjust lighting step ? I have Lenovo L520, and Fn + Light Up or Down adjusts by 20%, how can I adjust the step to 10% ? it will help me fine tune lighting at my dark room.
Samir Sabri
  • 836
21
votes
4 answers

Increase screen idle dim timeout

On Ubuntu 11.10, when on battery, the screen dims after 10 seconds of inactivity. This is annoying because it is too short. Is there anyway to increase this timeout? I know I can disable it, but that is not what I want.
amfcosta
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18
votes
5 answers

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 Backlight Below Minimum And it helped me resolved…
Cube
  • 299
18
votes
9 answers

Can't change brightness on version 22.04

I'm new to Linux, so I use Linux on dualboot. At the first time of installing Ubuntu, the brightness slider was working fine but when I made some updates + installed an Nvidia driver the slider is not doing anything anymore. Tried adding…
Reimner
  • 231
17
votes
6 answers

How to make keyboard backlight Fn buttons work in Samsung Series 9?

I've just installed Ubuntu 12.10 on my Samsung 900X4C. However, I can't get the keyboard backlights to work. I added the keymaps as per community docs - Samsung Series 9 (section Function Keys). But regardless of pressing Fn+F9 or F10 (backlight…
mmalmeida
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2 answers

Wayland equivalent to "xset led"

I have been using Ubuntu since 16.04, with the CM Storm keyboard. When using this keyboard on Windows, pressing the Scroll Lock key enables/disables the backlight. Previously on Ubuntu, the commands xset led (on) and xset -led (off) have worked to…
Jon
  • 161
16
votes
10 answers

nvidia backlight brightness problem

Problem Unity shows control while I press the Fn+Increase/Descrese brightness, but nothing happens. In console brightness doesn't work too while X server is running. Checked solutions I have tried ALL POSSIBLE solutions of this problem in google…
Max Tkachenko
  • 211
14
votes
8 answers

Lenovo Legion 5 15IMH05H brightness control problem

I have a Lenovo Legion 5 15IMH05H with a NVIDIA GeForce RTX 2060 6GB GDDR6/Intel Corporation UHD Graphics (rev 05) and an Intel Processor. After dual booting windows and Ubuntu 20.04, I encountered a few issues with changing the display brightness.…
Carl Krikorian
  • 333
14
votes
10 answers

Display brightness cannot be adjusted 18.04

I have recently installed Ubuntu mate 18.04 on my XPS 15 9560. I cannot adjust the display brightness through any means. I have tried the following: Set the acpi_backlight=vendor in boot parameters used xbacklight, which gives the following results…
xypnox
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