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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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How to modify the scale attribute of a backlight in sysfs?

How can a user change the scale attribute of a backlight that is exposed in sysfs? On my machine it's located at /sys/class/backlight/amdgpu_bl1/scale. I tried using udev to add write permissions to ...
basilm4r0's user avatar
2 votes
1 answer
366 views

Pop os brightness stuck at maximum

So I've encountered this problem every time I installed linux on my laptop. I've asked it before here, but that didn't go well. Now I'v installed Pop OS (22.04) and I'm fully committed to it, it's not ...
III_phr's user avatar
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Call XF86MonBrightnessUp and XF86MonBrightnessDown from terminal

I am running Qubes OS based on Fedora 36, and using i3wm. I am working on creating an i3 block similar to this contributed blocklet, but without using xbacklight. Why not xbacklight? My laptop has ...
ch-pub's user avatar
  • 101
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0 answers
42 views

brightness stuck at minimum

when i lower the brightness to a certain low degree (way over 0) the screen goes dark and is stuck thus; only with the use of a flashlight and the room in the dark i can barely see the screen. this is ...
ntrpris's user avatar
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33 views

New (but 2016) Razer keyboard backlight cycles

I get my new-but-old Razer keyboard (Blackwidow Ultimate 2016) out of the box. (old Kubuntu, can't update or install stuff) And keyboard works, but the back-light annoyingly goes on and off every few ...
pepster's user avatar
1 vote
0 answers
45 views

Virtually reconnecting keyboard

My problem is as follows: I use a Steelseries Apex M800 keyboard, which means it has proprietary RGB software for the keyboard backlight (I chose my keyboard before I switched to Linux, so I am aware ...
Jamarley's user avatar
0 votes
1 answer
645 views

Brightness control not working on IdeaPad 3 17ABA7 (amdgpu)

I have a Lenovo IdeaPad 3 17ABA7 with a fresh Debian Bullseye installation. Unfortunately the screen brightness control doesn't work out of the box. lspci lists the following video device: 04:00.0 VGA ...
scai's user avatar
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1 vote
1 answer
2k views

Turn off monitor backlight (DPMS) from a VC/VT (TTY) without Xorg/Wayland-DE

How does one flip a monitor's backlight on/off from the normal Linux console (tty1)? I'm looking for a way to do this without dependencies on Xorg or specific Wayland-Compositors. Let's say, that I ...
anick's user avatar
  • 505
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0 answers
273 views

Dell XPS 9360 FN brightness keys not detected Manjaro

I have Manjaro installed in dual boot on a Dell XPS 9360 with FHD screen non touchscreen. The key combo to increase/decrease the screen brightness are Fn+F11 and Fn+F12. This works perfectly on ...
Pablohoney's user avatar
0 votes
1 answer
2k views

Increase/Decrease Brightness F-keys on Keyboard not working in AlmaLinux?

After installing AlmaLinux on a Toshiba Portege laptop and choosing the workstation setup, the brightness control keys do not work. The hardware is capable and Linux compatible, as evidenced by the ...
Jack G's user avatar
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2 answers
152 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 ...
nicolai's user avatar
  • 101
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1 answer
207 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 ...
flaviut's user avatar
  • 904
0 votes
1 answer
500 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:...
Jowan's user avatar
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1 answer
58 views

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 ...
Corben's user avatar
  • 31
1 vote
1 answer
2k 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, ...
PolGZ's user avatar
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4 answers
3k 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....
camel's user avatar
  • 13
0 votes
1 answer
216 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 ...
user avatar
8 votes
2 answers
8k 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 ...
Thomas Luzat's user avatar
1 vote
0 answers
274 views

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 ...
Crabgrass0899's user avatar
2 votes
0 answers
115 views

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 ...
jdm's user avatar
  • 579
0 votes
1 answer
3k 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 ...
Daniil Bobrovskiy's user avatar
0 votes
1 answer
1k 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 ...
Tanmay B's user avatar
1 vote
0 answers
282 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....
scjorge's user avatar
  • 361
2 votes
1 answer
837 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?
user avatar
2 votes
1 answer
537 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/...
André Caldas's user avatar
1 vote
3 answers
3k 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 ...
T-Grave's user avatar
  • 13
6 votes
2 answers
3k 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 ...
Andreas's user avatar
  • 521
2 votes
2 answers
5k 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. ...
Abhishek Banerji's user avatar
2 votes
2 answers
527 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/...
ProcessingData...'s user avatar
1 vote
1 answer
2k 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 ...
Yurkee's user avatar
  • 121
0 votes
0 answers
1k 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 ...
vbhv's user avatar
  • 1
1 vote
0 answers
111 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 ...
Damon Kornhauser's user avatar
0 votes
1 answer
1k 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 ...
Evan Carroll's user avatar
  • 31.5k
2 votes
0 answers
725 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 ...
Ecuros's user avatar
  • 21
2 votes
1 answer
1k 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 ...
e.doroskevic's user avatar
0 votes
1 answer
256 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/...
Piotr Jedyk's user avatar
8 votes
3 answers
17k 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: ...
Michael A's user avatar
  • 1,613
1 vote
1 answer
828 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?
user32569's user avatar
  • 193
2 votes
1 answer
371 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. ...
sourcejedi's user avatar
  • 50.9k
1 vote
2 answers
1k 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. ...
Ivan's user avatar
  • 17.9k
8 votes
3 answers
6k 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 ...
Jezor's user avatar
  • 155
0 votes
1 answer
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 ...
Timas Jackus's user avatar
0 votes
1 answer
748 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 ...
dman's user avatar
  • 537
2 votes
0 answers
595 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 ...
Connor's user avatar
  • 21
1 vote
0 answers
452 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 ...
Artur Lodklif's user avatar
4 votes
0 answers
343 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 ...
Jeffrey Lebowski's user avatar
1 vote
1 answer
10k 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 [email protected]. I see only a ...
Volker Raschek's user avatar
1 vote
1 answer
1k 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 ...
Weston Reed's user avatar
3 votes
1 answer
363 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 ...
Enginecrafter77's user avatar
0 votes
2 answers
982 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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