Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [backlight]

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

1
vote
0answers
38 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 ...
0
votes
0answers
23 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 ...
0
votes
1answer
22 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/...
4
votes
3answers
956 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: ...
1
vote
1answer
107 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?
1
vote
1answer
60 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. ...
1
vote
2answers
397 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. ...
4
votes
2answers
482 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 ...
0
votes
1answer
1k 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 ...
0
votes
1answer
167 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 ...
2
votes
0answers
312 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 ...
1
vote
0answers
268 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 ...
4
votes
0answers
105 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 ...
0
votes
1answer
1k 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 ...
1
vote
1answer
648 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 ...
3
votes
1answer
131 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 ...
0
votes
2answers
503 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",...
3
votes
1answer
2k 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 ...
1
vote
1answer
1k 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. ...
1
vote
1answer
1k 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 ...
1
vote
1answer
610 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 ...
9
votes
1answer
5k 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 ...
2
votes
0answers
816 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, ...
3
votes
0answers
595 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 ...
1
vote
0answers
301 views

Optimus, random freeze without nomodeset, no backlight support with nomodeset

I recently had at work an HP zbook 15 G3 (dual graphic cards: Intel integrated and Nvidia Quadro) I had first Ubuntu with Plasma desktop installed by the lab (worked OK except with second screen and ...
2
votes
1answer
371 views

FreeBSD Nvidia drivers Screen Brightness & Power Management

I am running FreeBSD 11RC2 with The current Nvidia-driver version 367.44 and using the nvidia-modeset kernel module that's loaded at startup in my /etc/rc.conf file by adding kld_list="nvidia-...
2
votes
3answers
1k views

Debian testing unable to get screen information and control brightness with Gnome 3.21.90

After upgrading Debian testing on Dell XPS13 (2015) yesterday, to Gnome 3.21.90, none of the Gnome applications are able to get screen information anymore, and brightness control broke (Fn+F11 and Fn+...
0
votes
1answer
2k views

Broken Backlight Controls on Linux Mint 18 with Nvidia Proprietary Driver

I've just installed Linux Mint 18 on a clean partition on my Thinkpad T420. It uses an NVS4200M graphics chipset, which is an Optimus-based card. However, I have disabled Optimus in the BIOS, and ...
3
votes
2answers
13k views

xbacklight not working

I have my ASUS X556U with DualBoot between W10 and Debian Jessie, but I need to regulate the brightness. I've been serching in Google and I found xbacklight, but I have a problem while executing it: ...
1
vote
1answer
478 views

Booting with acpi_osi=Linux fixes fan control but breaks brightness keys

I am running Debian 8 with the 3.16 kernel on an eeePC 1001P. I have a fair bit of Linux experience but unfortunately this one has me and my google-fu at a loss. Initially almost everything worked ...
1
vote
0answers
440 views

How does xbacklight work?

I just noticed that if I uninstall xserver-xorg-video-intel, then xbacklight will stop working and give this error: No outputs have backlight property, although it worked flawlessly before that. This ...
1
vote
1answer
448 views

xbacklight not working on Debian Jessie, lenovo S10

I'm trying to change the backlight via xbacklight but this is not working. Although xbacklight -set X causes xbacklight -get to return X, the real monitor backlight is unchanged. The ...
0
votes
1answer
1k views

How to make video driver work in Debian Jessie

I have an Acer Aspire ES1-531-P8JN. It has the Intel N3700 CPU with integrated graphics. I have the problem that the video driver i915 does not seem to work in Debian Jessie 8.3.0, even though it does ...
3
votes
3answers
9k views

Set bindings in i3 to control keyboard backlight

For my i3 window-manager settings, I am looking for a command line tool, similar to xbacklight, but to control the brightness of the leds which are in the keyboard. Basically, I can set up the leds ...
0
votes
1answer
5k views

how to set acpi_osi parameter in the grub

This is a question about a problem I could fix but I do not know why the fix works. I wanted to be able to adjust the backlight from keyboard and the only thing which fixed that was changing a line ...
2
votes
2answers
931 views

Fix brightness linux mint 17.2

How can i fix screen brightness i read a lot of document like install xbacklight it work only on terminalt but screen still the same i read also edit grub and append "acpi_backlight=vendor" or "video....
3
votes
1answer
3k views

Trouble changing backlight brightness (/sys/class/backlight folder empty)

I have a small embedded system that I am working on that needs to be able to reduce its brightness for power saving reasons. The screen is connected by LVDS with separate Inverter Power Output ...
1
vote
0answers
736 views

Screen turns black during boot in Debian Jessie

Sometimes, after I start Debian from grub, the screen will turn black. This happens at the time when normally the font changes and the green/red "[success]"/"[Failed]" messages start appearing. The ...
1
vote
1answer
173 views

Debian Jessie Nvidia proprietary drivers and screen brightness buttons

How do you make Mac OS X screen brightness work when using Debian Jessie 8 and Nvidia proprietary drivers? There are a lot of answers floating around about editing the config file adding some options ...
1
vote
0answers
236 views

Backlight control configuration misbehaves on an Ideapad.

I did a clean Ubuntu install on a Lenovo Ideapad P500. The backlight started okay, but after pressing the keyboard light function once, it got reset to a very dark state. The brightness setting ...
5
votes
1answer
517 views

Brightness falls at 0 when plugging second monitor

This only happens when using Gnome. I have an Acer Aspire V3-772GTX54206G1TMakk laptop with an NVIDIA GeForce GTX 760M graphics card running Debian 8 (jessie) 64-bit, and I'm using Gnome 3.14.1. The ...
0
votes
1answer
510 views

ACPI – how to select correct LED and LCD module

I'm facing a strange issue. I have ASUS x551ma notebook; As I can get it, after a while (20-30 min) watching LCD, I suffer eye strain. The graphics (video card) seems fine but the LED is micro-shaking ...
2
votes
0answers
1k views

Disable backlight device

I have two backlight devices in /sys/class/backlight: toshiba and intel_backlight. The former works only before I put my laptop on sleep and the latter works perfectly. /sys/class/backlight/toshiba/...
3
votes
0answers
2k views

Why can't I adjust the backlight's brightness?

Lenovo Z500 series Intel graphic 4000 on Manjaro (latest, installed 2 days ago, fully updated) I have a Lenovo laptop and I never had any problem under Linux Mint with the backlight... I installed ...
0
votes
0answers
929 views

Manipulation of the backlight in a embedded linux device is unstable

I want to control the backlight value of a LCD monitor in a embedded linux device. Doing researches throughout the internet I found a couple of references saying that the file called backlight inside ...
3
votes
2answers
4k views

How do I turn off the backlight but leave the LCD on?

How do I set zero brightness on laptops that have a nonzero minimum brightness on the brightness control? The solution should work regardless of X. I.e. it should also work in the virtual terminals.
5
votes
3answers
3k views

How do I get my laptop screen backlight brightness controls to work?

What do I need to do to get my laptop screen backlight brightness controls to work? I currently have Ubuntu 13.04 and a Dell Studio 1558. After reading these two links: https://bugs.launchpad.net/...
1
vote
1answer
809 views

Unable to change backlight level

In Manjaro I can't set the backlight. I've tried to add: acpi_osi=Linux acpi_backlight=vendor to the kernel's command line but it didn't work. And I also added Option "RegistryDwords" "...
3
votes
1answer
3k views

Backlight control manjaro linux

I'm new to Arch/Manjaro. I've installed it onto my Sony Vaio Vpceh1m1e. I cannot change the backlight value. I've solved this before on ubuntu, add this line to the xorg.conf: Option "...