Questions tagged [backlight]

Question about controlling the background illumination of liquid crystal displays (LCDs). For issues about backlit keyboards, use "keyboard-backlight" instead.

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12 views

How to subscribe to screen dim event on linux

I have a script which corrects my screen brightness based on an ambient light sensor. I want it to stop changing my screen brightness when my screen dims as a result of user inactivity. How can I ...
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1answer
5 views

Backlight adjustment buttons on Thinpad T495 don't work

I don't see any events when I run xev and press either the brightness up or down keys. I have configured i3wm to handle the XF86MonBrightnessDown and XF86MonBrightnessUp, but they won't get triggered ...
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Change steps of backlight brightness and keep using cinnamon animations

I know and use writing to /sys/class/backlight, now I want to keep using standard Cinnamon way to adjust brightness as I like icons/animations it displays when hotkeys are pressed. I was not able to ...
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1answer
28 views

"Failed to start load/save screen backlight brightness" after spontaneous restart

My PC is running Manjaro. Unfortunately since recently my PC is restarted by itself and is then displayed to me that. [FAILED] Failed to start load/save screen backlight brightness of backlight:...
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1answer
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RGB-backlight keyboard interactive context-sensitive integration with Linux environment

I would like for example when editing in VI, that my RGB keyboard would highlight shortcut keys in different colors, or when I press CTRL in gnome then pgup, pgdown, up, down, would be highlighted in ...
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1answer
202 views

Remap backlight/brightness to other keys on XFCE

I have a laptop with Manjaro XFCE and I damaged my F2 and F3 keys, which operate the brightness of the display (up and down respectively) while holding the Fn key. The xfce-power-manager works fine, ...
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166 views

Brightness control not working - Linux Mint 20.2

I can't control the screen brightness on my new Dell XPS-15-9510 when using Linux. I have dual-boot with a fresh install of Linux Mint with the following specs: $ uname -a Linux XPS-15-9510 5.4.0-80-...
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1answer
531 views

Lenovo screen backlight can not set with brightness function Fn keys

Being aware of that this is partially a known issue, since each is individual and different, the problem is as following: On my Lenovo Laptop with Linux Mint the backlight cannot be set using Fn+F6/F7....
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How to select from multiple backlight devices?

For some reason, Linux (Fedora, both 33 and 34) exposes two backlight devices on my old Acer Aspire One - /sys/class/backlight/acpi_video0 and /sys/class/backlight/intel_backlight. The former (...
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1answer
79 views

Please help me with my persistent brightness control issue

I've had this issue throughout distros. Arch, Debian, Mint, etc. Tried gnome, kde, xfce. My brightness control buttons, Fn+Vol_Up / Fn+Vol_Down will not actually do anything. I still get a gui ...
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1answer
4k views

Backlight control not working on Lenovo IdeaPad Gaming 3 with Renoir / AMDGPU

The brightness (LCD backlight) controls on a Lenovo IdeaPad Gaming 3 (15ARH05, LCD display, AMD Renoir CPU Ryzen 5 4600H, discrete NVIDIA GeForce 1650 Ti Mobile) are not working: Fn keys show the ...
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Redshift prevents manual backlight adjustment (LXQt)

Redshift seems to work fine, dimming my screen with the red tint at night, but when Redshift is running (whether actively enabled or not) I cannot control laptop brightness with the laptop brightness ...
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Specify minimum backlight level with pwm-backlight

I have a device that uses PWM for backlight. It is using the pwm-backlight driver. However, you can turn the backlight down so far that the screen turns off, and then it is hard to turn it on again ...
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1answer
2k views

xrandr and xbacklight not changing brightness in ubuntu 18.04

I reinstalled NVIDIA drivers on my Dell laptop with Ubuntu 18.04 and xbacklight stopped working. I never managed before to adjust brightness using system shortcut keys (changing GRUB settings didn't ...
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1answer
385 views

How do I enable back-light controls without making my display flicker?

I am new to Linux and I am using Debian Testing with KDE Plasma installed during the installation process(i.e. tasksel). I had a problem with my brightness controls (the Fn keys or the brightness ...
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137 views

is my Lid Switch broken? [Debian]

yesterday, on a ThinkPad Edge E520-1143B laptop, I did an upgrade from Debian 9 (Stretch) to Debian 10 (Buster) following these two guides: https://wiki.debian.org/DebianUpgrade https://linuxconfig....
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1answer
296 views

Minimalist X11 tool for night light

I'm running OpenBox on a Debian 10 Buster system and I'm looking for a simple minimalist command line tool to toggle night light (as in Ubuntu). Any suggestions?
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1answer
231 views

Non-integer value to (/sys/class/backlight/intel_backlight/brightness)

Some two years ago, I was able to set a very dim backlight brightness by writing a non-integer value to /sys/class/backlight/intel_backlight/brightness. $ echo 0.3 > /sys/class/backlight/...
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3answers
2k views

Back-light control for dual screen laptop

I've recently installed Pop!_OS on my new Asus Zenbook Pro Duo - UX581G. This laptop has 2 built-in displays and they work out of the box on linux just fine, at least for the most part. Using xrandr ...
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2answers
2k views

Adjust backlight via DDC?

I'm looking for a simple way of adjusting an external monitor's backlight using DDC. Something like good-ddc-tool --monitor 0 --backlight 100 that just works without complicating things when a single ...
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2answers
3k views

i3 Screen Brightness Control using light

So i have recently started using i3 on my arch install. slowly i setup my config files with keybinds and all. About 2 days ago i install light ( to control screen brightness ) and it was working fine. ...
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2answers
305 views

Why does acpi_listen show different events for gnome-session vs i3?

When I run acpi_listen while running gnome-session or ubuntu-session, and press the Brightness Up/Down keys on the keyboard, I get output like this: video/brightnessdown BRTDN 00000087 00000000 video/...
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1answer
931 views

Brightness - external monitor drivers

I'm using Linux arch on Thinkpad X1C6. I bought external monitor Samsung C27F396FHU and I have a problem with brightness. I cannot use a physical button to adjust the brightness of the monitor - at ...
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630 views

Backlight of external keyboard with linux mint

I just bought Redgear Grimm backlight external keyboard to work with linux mint 18.3. The backlight didn't work initially and after some poking around I found /sys/class/leds/ and I am able to turn ...
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83 views

KEEP backlight off + LCD on with cursor/keyboard input

I'm trying to keep my backlight off but the LCD on even though inputs are coming from the keyboard and/or trackpad. I'm working on an Asus Aspire One running Linux Mint (32bit). I've just installed ...
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1answer
762 views

Intel i915 and xbacklight: No outputs have backlight property

When I run xbacklight I get xbacklight No outputs have backlight property I've seen other posts mentions this but I do have a /sys/class/backlight/intel_backlight. I can write to the file and this ...
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0answers
450 views

Changing screen brightness with keys doesn't work on clevo based laptop

So I've got Debian with GNOME on my Clevo N85_87HP6 laptop with a GTX1060 video display adapter plus Intel's integrated GPU. Pressing fn + f8/f9doesn't change my screen's brightness. I've tried using ...
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1answer
602 views

brightness | xrandr | what does it mean - software only modification?

xrandr --brightness brightness - multiply the gamma values on the crtc currently attached to the output to specified floating value. Useful for overly bright or overly dim outputs. However, this ...
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1answer
117 views

How to blacklist pwm_backlight?

I want to control PWM from sysfs. I have /sys/class/pwm/pwmchip0 and cat npwm gives 1. However, when I try to echo 0 >> export I am given with Device or resource busy. I checked cat /sys/kernel/...
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3answers
11k views

"No outputs have backlight property" but xorg.conf is configured and xbacklight is installed

I'm using a Lenovo laptop with Intel video drivers, and I'm trying to control the brightness. I installed the xbacklight and xserver-xorg-video-intel packages, added these lines to /etc/X11/xorg.conf: ...
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1answer
481 views

Find driver used for backlight control

I can control backlight using /sys/class/backlight/.. but is there a way to identify which driver (module) is used internally to actually control the backlight intensity?
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1answer
286 views

What mechanism allows the unprivileged graphical session to control the backlight device?

Wayland (or unprivileged Xorg) is able to access DRM and input devices by fd-passing from systemd-logind or equivalent. I can see these devices (for the first seat) in loginctl seat-status seat0. ...
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2answers
940 views

How to possibly turn a display physically off and on with a software command?

Is there a software way to ask the video driver to turn a display physically off and on? Some times (often) my laptop built-in display backlight won't turn on after the laptop wakes up from suspend. ...
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3answers
4k views

How can I change the backlight of an external monitor?

I have a laptop with an external monitor connected via HDMI (output name is HDMI1). The command xbacklight works only with my primary screen (which is the laptop screen). It doesn't work even if I ...
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1answer
2k views

Lenovo Y720 Keyboard backlight & Extreme cooling on Arch Linux

I installed ArchLinux on my Lenovo Legion Y720 laptop and I can't turn on Keyboard lights and Extreme Cooling as I could in Windows 10 using Lenovo NerveSense app. How can I access these on Linux? Is ...
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1answer
581 views

Alienware R3 touchpad light in linux

I got a new Gentoo linux install running great on my new Alienware 13" R3 laptop. The keyboard lights light up great, but not the touch pad...which does light up in Windows. Does anyone how to ...
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0answers
505 views

Can't control backlight on Thinkpad P50 running Debian stretch

I've got a Thinkpad P50 running the latest version of Debian stretch. My desktop environment is mate. I'm unable to control my laptop's backlight through any means. There are no backlight interfaces ...
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0answers
383 views

CentOS 6.9 brightness change don't work

I have Intel HD 620 graphics card on my laptop. I have installed CentOS 6.9, but I can't change brightness of my monitor. On Windows 10 it works without any problem. In my case /sys/class/backlight ...
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0answers
279 views

Turn off LCD backlight so that mouse and keyboard do not wake the screen

I'm trying to accomplish what I had in my old ASUS U36SG laptop: an Fn key turned the screen off. Hitting any key or touching the mouse/touchpad wouldn't wake the screen, only the same Fn combination ...
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1answer
8k views

backlight:acpi_video0: No such device

I installed for two weeks Arch Linux. As Display Manager I have installed LightDM. For some days I get an error durning system boot from lightdm.service and systemd-backlight@.service. I see only a ...
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1answer
943 views

Brightness key issue on Lenovo P71

I've got a Lenovo Thinkpad P71 with the NVidia Quadro P3000, that has the "Discrete Graphics" setting on the BIOS, and I'm using the proprietary drivers on Debian 9. For some reason, the brightness ...
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1answer
264 views

Sysfs LCD backlight as thermal device

I have Compaq CQ60-120ec notebook. I discovered that there is a directory /sys/class/thermal/cooling_device2. The type said LCD. I tried to control the cooling device, and it dimmed my backlight on ...
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2answers
738 views

Macbook backlight not working on Arch

I am not able to set my screen brightness on my macbook running arch linux. The macbook is a 15 inch 2012 model and I am using Arch Linux 4.11.5-1. I have read up on arch linux wiki "backlight", "Mac",...
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1answer
4k views

Control backlight as a user (without xbacklight)

I'm working on Gentoo and Intel modesetting driver for my video card. That's why xbacklight isn't working. I can write inside /sys/class/backlight... whith a root acount but that's not what I want ...
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1answer
4k views

Bind function keys laptop

I've just bought a new laptop and I tried to create Keyboard Shortcut to manage screen backlight because the keyboard has them (on the key) but my Xubuntu 16.04 doesn't recognize the correct action. ...
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1answer
2k views

Brightness Function Keys (F5 & F6) not working in RHEL 7, HP laptop

Problem: Backlight function keys don't work in KDE, but brightness can be adjusted via "Display Brightness" GUI located in lower right power management icon. Specs: OS: RHEL 7 Window manager: KDE ...
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1answer
907 views

Backlight slider no longer works in Linux Mint

I'm running Linux Mint 18 Cinnamon on my Asus X555LA, which also has Windows 10 installed on another partition (the backlight works perfectly in Windows). However in Linux Mint: there's already an ...
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3answers
18k views

XF86MonBrightnessUp/XF86MonBrightnessDown special keys not working

I'm trying to enable some multimedia keys, and the ones for volume do work. F5 and F6, the ones for increasing/decreasing do not work, I do not know why. When I run in the terminal: xbacklight +10 I ...
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0answers
1k views

Change keyboard backlight on or off

Location of the cfg files for this are in /sys/class/leds. Here I have a few Input values, when I try to edit capslock, all I have to do is set /sys/class/leds/input3::capslock/brightness with 0/1, ...
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0answers
768 views

Brightness control keys not working in linux

I recently bought the Lenovo 500s-14isk and it came with windows 10 installed. Yesterday, I installed in dual boot mode Elementary OS. Didn't notice anything wrong during the installation, but the ...